RAHHH

backend/frontend/node_modules/@webassemblyjs/ast/lib/clone.js

@@ -0,0 +1,11 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.cloneNode = cloneNode;
+
+function cloneNode(n) {
+  // $FlowIgnore
+  return Object.assign({}, n);
+}

backend/frontend/node_modules/@webassemblyjs/ast/lib/definitions.js

@@ -0,0 +1,670 @@
+"use strict";
+
+var definitions = {};
+
+function defineType(typeName, metadata) {
+  definitions[typeName] = metadata;
+}
+
+defineType("Module", {
+  spec: {
+    wasm: "https://webassembly.github.io/spec/core/binary/modules.html#binary-module",
+    wat: "https://webassembly.github.io/spec/core/text/modules.html#text-module"
+  },
+  doc: "A module consists of a sequence of sections (termed fields in the text format).",
+  unionType: ["Node"],
+  fields: {
+    id: {
+      maybe: true,
+      type: "string"
+    },
+    fields: {
+      array: true,
+      type: "Node"
+    },
+    metadata: {
+      optional: true,
+      type: "ModuleMetadata"
+    }
+  }
+});
+defineType("ModuleMetadata", {
+  unionType: ["Node"],
+  fields: {
+    sections: {
+      array: true,
+      type: "SectionMetadata"
+    },
+    functionNames: {
+      optional: true,
+      array: true,
+      type: "FunctionNameMetadata"
+    },
+    localNames: {
+      optional: true,
+      array: true,
+      type: "ModuleMetadata"
+    },
+    producers: {
+      optional: true,
+      array: true,
+      type: "ProducersSectionMetadata"
+    }
+  }
+});
+defineType("ModuleNameMetadata", {
+  unionType: ["Node"],
+  fields: {
+    value: {
+      type: "string"
+    }
+  }
+});
+defineType("FunctionNameMetadata", {
+  unionType: ["Node"],
+  fields: {
+    value: {
+      type: "string"
+    },
+    index: {
+      type: "number"
+    }
+  }
+});
+defineType("LocalNameMetadata", {
+  unionType: ["Node"],
+  fields: {
+    value: {
+      type: "string"
+    },
+    localIndex: {
+      type: "number"
+    },
+    functionIndex: {
+      type: "number"
+    }
+  }
+});
+defineType("BinaryModule", {
+  unionType: ["Node"],
+  fields: {
+    id: {
+      maybe: true,
+      type: "string"
+    },
+    blob: {
+      array: true,
+      type: "string"
+    }
+  }
+});
+defineType("QuoteModule", {
+  unionType: ["Node"],
+  fields: {
+    id: {
+      maybe: true,
+      type: "string"
+    },
+    string: {
+      array: true,
+      type: "string"
+    }
+  }
+});
+defineType("SectionMetadata", {
+  unionType: ["Node"],
+  fields: {
+    section: {
+      type: "SectionName"
+    },
+    startOffset: {
+      type: "number"
+    },
+    size: {
+      type: "NumberLiteral"
+    },
+    vectorOfSize: {
+      comment: "Size of the vector in the section (if any)",
+      type: "NumberLiteral"
+    }
+  }
+});
+defineType("ProducersSectionMetadata", {
+  unionType: ["Node"],
+  fields: {
+    producers: {
+      array: true,
+      type: "ProducerMetadata"
+    }
+  }
+});
+defineType("ProducerMetadata", {
+  unionType: ["Node"],
+  fields: {
+    language: {
+      type: "ProducerMetadataVersionedName",
+      array: true
+    },
+    processedBy: {
+      type: "ProducerMetadataVersionedName",
+      array: true
+    },
+    sdk: {
+      type: "ProducerMetadataVersionedName",
+      array: true
+    }
+  }
+});
+defineType("ProducerMetadataVersionedName", {
+  unionType: ["Node"],
+  fields: {
+    name: {
+      type: "string"
+    },
+    version: {
+      type: "string"
+    }
+  }
+});
+/*
+Instructions
+*/
+
+defineType("LoopInstruction", {
+  unionType: ["Node", "Block", "Instruction"],
+  fields: {
+    id: {
+      constant: true,
+      type: "string",
+      value: "loop"
+    },
+    label: {
+      maybe: true,
+      type: "Identifier"
+    },
+    resulttype: {
+      maybe: true,
+      type: "Valtype"
+    },
+    instr: {
+      array: true,
+      type: "Instruction"
+    }
+  }
+});
+defineType("Instr", {
+  unionType: ["Node", "Expression", "Instruction"],
+  fields: {
+    id: {
+      type: "string"
+    },
+    object: {
+      optional: true,
+      type: "Valtype"
+    },
+    args: {
+      array: true,
+      type: "Expression"
+    },
+    namedArgs: {
+      optional: true,
+      type: "Object"
+    }
+  }
+});
+defineType("IfInstruction", {
+  unionType: ["Node", "Instruction"],
+  fields: {
+    id: {
+      constant: true,
+      type: "string",
+      value: "if"
+    },
+    testLabel: {
+      comment: "only for WAST",
+      type: "Identifier"
+    },
+    test: {
+      array: true,
+      type: "Instruction"
+    },
+    result: {
+      maybe: true,
+      type: "Valtype"
+    },
+    consequent: {
+      array: true,
+      type: "Instruction"
+    },
+    alternate: {
+      array: true,
+      type: "Instruction"
+    }
+  }
+});
+/* 
+Concrete value types
+*/
+
+defineType("StringLiteral", {
+  unionType: ["Node", "Expression"],
+  fields: {
+    value: {
+      type: "string"
+    }
+  }
+});
+defineType("NumberLiteral", {
+  unionType: ["Node", "NumericLiteral", "Expression"],
+  fields: {
+    value: {
+      type: "number"
+    },
+    raw: {
+      type: "string"
+    }
+  }
+});
+defineType("LongNumberLiteral", {
+  unionType: ["Node", "NumericLiteral", "Expression"],
+  fields: {
+    value: {
+      type: "LongNumber"
+    },
+    raw: {
+      type: "string"
+    }
+  }
+});
+defineType("FloatLiteral", {
+  unionType: ["Node", "NumericLiteral", "Expression"],
+  fields: {
+    value: {
+      type: "number"
+    },
+    nan: {
+      optional: true,
+      type: "boolean"
+    },
+    inf: {
+      optional: true,
+      type: "boolean"
+    },
+    raw: {
+      type: "string"
+    }
+  }
+});
+defineType("Elem", {
+  unionType: ["Node"],
+  fields: {
+    table: {
+      type: "Index"
+    },
+    offset: {
+      array: true,
+      type: "Instruction"
+    },
+    funcs: {
+      array: true,
+      type: "Index"
+    }
+  }
+});
+defineType("IndexInFuncSection", {
+  unionType: ["Node"],
+  fields: {
+    index: {
+      type: "Index"
+    }
+  }
+});
+defineType("ValtypeLiteral", {
+  unionType: ["Node", "Expression"],
+  fields: {
+    name: {
+      type: "Valtype"
+    }
+  }
+});
+defineType("TypeInstruction", {
+  unionType: ["Node", "Instruction"],
+  fields: {
+    id: {
+      maybe: true,
+      type: "Index"
+    },
+    functype: {
+      type: "Signature"
+    }
+  }
+});
+defineType("Start", {
+  unionType: ["Node"],
+  fields: {
+    index: {
+      type: "Index"
+    }
+  }
+});
+defineType("GlobalType", {
+  unionType: ["Node", "ImportDescr"],
+  fields: {
+    valtype: {
+      type: "Valtype"
+    },
+    mutability: {
+      type: "Mutability"
+    }
+  }
+});
+defineType("LeadingComment", {
+  unionType: ["Node"],
+  fields: {
+    value: {
+      type: "string"
+    }
+  }
+});
+defineType("BlockComment", {
+  unionType: ["Node"],
+  fields: {
+    value: {
+      type: "string"
+    }
+  }
+});
+defineType("Data", {
+  unionType: ["Node"],
+  fields: {
+    memoryIndex: {
+      type: "Memidx"
+    },
+    offset: {
+      type: "Instruction"
+    },
+    init: {
+      type: "ByteArray"
+    }
+  }
+});
+defineType("Global", {
+  unionType: ["Node"],
+  fields: {
+    globalType: {
+      type: "GlobalType"
+    },
+    init: {
+      array: true,
+      type: "Instruction"
+    },
+    name: {
+      maybe: true,
+      type: "Identifier"
+    }
+  }
+});
+defineType("Table", {
+  unionType: ["Node", "ImportDescr"],
+  fields: {
+    elementType: {
+      type: "TableElementType"
+    },
+    limits: {
+      assertNodeType: true,
+      type: "Limit"
+    },
+    name: {
+      maybe: true,
+      type: "Identifier"
+    },
+    elements: {
+      array: true,
+      optional: true,
+      type: "Index"
+    }
+  }
+});
+defineType("Memory", {
+  unionType: ["Node", "ImportDescr"],
+  fields: {
+    limits: {
+      type: "Limit"
+    },
+    id: {
+      maybe: true,
+      type: "Index"
+    }
+  }
+});
+defineType("FuncImportDescr", {
+  unionType: ["Node", "ImportDescr"],
+  fields: {
+    id: {
+      type: "Identifier"
+    },
+    signature: {
+      type: "Signature"
+    }
+  }
+});
+defineType("ModuleImport", {
+  unionType: ["Node"],
+  fields: {
+    module: {
+      type: "string"
+    },
+    name: {
+      type: "string"
+    },
+    descr: {
+      type: "ImportDescr"
+    }
+  }
+});
+defineType("ModuleExportDescr", {
+  unionType: ["Node"],
+  fields: {
+    exportType: {
+      type: "ExportDescrType"
+    },
+    id: {
+      type: "Index"
+    }
+  }
+});
+defineType("ModuleExport", {
+  unionType: ["Node"],
+  fields: {
+    name: {
+      type: "string"
+    },
+    descr: {
+      type: "ModuleExportDescr"
+    }
+  }
+});
+defineType("Limit", {
+  unionType: ["Node"],
+  fields: {
+    min: {
+      type: "number"
+    },
+    max: {
+      optional: true,
+      type: "number"
+    },
+    // Threads proposal, shared memory
+    shared: {
+      optional: true,
+      type: "boolean"
+    }
+  }
+});
+defineType("Signature", {
+  unionType: ["Node"],
+  fields: {
+    params: {
+      array: true,
+      type: "FuncParam"
+    },
+    results: {
+      array: true,
+      type: "Valtype"
+    }
+  }
+});
+defineType("Program", {
+  unionType: ["Node"],
+  fields: {
+    body: {
+      array: true,
+      type: "Node"
+    }
+  }
+});
+defineType("Identifier", {
+  unionType: ["Node", "Expression"],
+  fields: {
+    value: {
+      type: "string"
+    },
+    raw: {
+      optional: true,
+      type: "string"
+    }
+  }
+});
+defineType("BlockInstruction", {
+  unionType: ["Node", "Block", "Instruction"],
+  fields: {
+    id: {
+      constant: true,
+      type: "string",
+      value: "block"
+    },
+    label: {
+      maybe: true,
+      type: "Identifier"
+    },
+    instr: {
+      array: true,
+      type: "Instruction"
+    },
+    result: {
+      maybe: true,
+      type: "Valtype"
+    }
+  }
+});
+defineType("CallInstruction", {
+  unionType: ["Node", "Instruction"],
+  fields: {
+    id: {
+      constant: true,
+      type: "string",
+      value: "call"
+    },
+    index: {
+      type: "Index"
+    },
+    instrArgs: {
+      array: true,
+      optional: true,
+      type: "Expression"
+    },
+    numeric: {
+      type: "Index",
+      optional: true
+    }
+  }
+});
+defineType("CallIndirectInstruction", {
+  unionType: ["Node", "Instruction"],
+  fields: {
+    id: {
+      constant: true,
+      type: "string",
+      value: "call_indirect"
+    },
+    signature: {
+      type: "SignatureOrTypeRef"
+    },
+    intrs: {
+      array: true,
+      optional: true,
+      type: "Expression"
+    }
+  }
+});
+defineType("ByteArray", {
+  unionType: ["Node"],
+  fields: {
+    values: {
+      array: true,
+      type: "Byte"
+    }
+  }
+});
+defineType("Func", {
+  unionType: ["Node", "Block"],
+  fields: {
+    name: {
+      maybe: true,
+      type: "Index"
+    },
+    signature: {
+      type: "SignatureOrTypeRef"
+    },
+    body: {
+      array: true,
+      type: "Instruction"
+    },
+    isExternal: {
+      comment: "means that it has been imported from the outside js",
+      optional: true,
+      type: "boolean"
+    },
+    metadata: {
+      optional: true,
+      type: "FuncMetadata"
+    }
+  }
+});
+/**
+ * Intrinsics
+ */
+
+defineType("InternalBrUnless", {
+  unionType: ["Node", "Intrinsic"],
+  fields: {
+    target: {
+      type: "number"
+    }
+  }
+});
+defineType("InternalGoto", {
+  unionType: ["Node", "Intrinsic"],
+  fields: {
+    target: {
+      type: "number"
+    }
+  }
+});
+defineType("InternalCallExtern", {
+  unionType: ["Node", "Intrinsic"],
+  fields: {
+    target: {
+      type: "number"
+    }
+  }
+}); // function bodies are terminated by an `end` instruction but are missing a
+// return instruction
+//
+// Since we can't inject a new instruction we are injecting a new instruction.
+
+defineType("InternalEndAndReturn", {
+  unionType: ["Node", "Intrinsic"],
+  fields: {}
+});
+module.exports = definitions;

backend/frontend/node_modules/@webassemblyjs/ast/lib/index.js

@@ -0,0 +1,129 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+var _exportNames = {
+  numberLiteralFromRaw: true,
+  withLoc: true,
+  withRaw: true,
+  funcParam: true,
+  indexLiteral: true,
+  memIndexLiteral: true,
+  instruction: true,
+  objectInstruction: true,
+  traverse: true,
+  signatures: true,
+  cloneNode: true,
+  moduleContextFromModuleAST: true
+};
+Object.defineProperty(exports, "numberLiteralFromRaw", {
+  enumerable: true,
+  get: function get() {
+    return _nodeHelpers.numberLiteralFromRaw;
+  }
+});
+Object.defineProperty(exports, "withLoc", {
+  enumerable: true,
+  get: function get() {
+    return _nodeHelpers.withLoc;
+  }
+});
+Object.defineProperty(exports, "withRaw", {
+  enumerable: true,
+  get: function get() {
+    return _nodeHelpers.withRaw;
+  }
+});
+Object.defineProperty(exports, "funcParam", {
+  enumerable: true,
+  get: function get() {
+    return _nodeHelpers.funcParam;
+  }
+});
+Object.defineProperty(exports, "indexLiteral", {
+  enumerable: true,
+  get: function get() {
+    return _nodeHelpers.indexLiteral;
+  }
+});
+Object.defineProperty(exports, "memIndexLiteral", {
+  enumerable: true,
+  get: function get() {
+    return _nodeHelpers.memIndexLiteral;
+  }
+});
+Object.defineProperty(exports, "instruction", {
+  enumerable: true,
+  get: function get() {
+    return _nodeHelpers.instruction;
+  }
+});
+Object.defineProperty(exports, "objectInstruction", {
+  enumerable: true,
+  get: function get() {
+    return _nodeHelpers.objectInstruction;
+  }
+});
+Object.defineProperty(exports, "traverse", {
+  enumerable: true,
+  get: function get() {
+    return _traverse.traverse;
+  }
+});
+Object.defineProperty(exports, "signatures", {
+  enumerable: true,
+  get: function get() {
+    return _signatures.signatures;
+  }
+});
+Object.defineProperty(exports, "cloneNode", {
+  enumerable: true,
+  get: function get() {
+    return _clone.cloneNode;
+  }
+});
+Object.defineProperty(exports, "moduleContextFromModuleAST", {
+  enumerable: true,
+  get: function get() {
+    return _astModuleToModuleContext.moduleContextFromModuleAST;
+  }
+});
+
+var _nodes = require("./nodes");
+
+Object.keys(_nodes).forEach(function (key) {
+  if (key === "default" || key === "__esModule") return;
+  if (Object.prototype.hasOwnProperty.call(_exportNames, key)) return;
+  if (key in exports && exports[key] === _nodes[key]) return;
+  Object.defineProperty(exports, key, {
+    enumerable: true,
+    get: function get() {
+      return _nodes[key];
+    }
+  });
+});
+
+var _nodeHelpers = require("./node-helpers.js");
+
+var _traverse = require("./traverse");
+
+var _signatures = require("./signatures");
+
+var _utils = require("./utils");
+
+Object.keys(_utils).forEach(function (key) {
+  if (key === "default" || key === "__esModule") return;
+  if (Object.prototype.hasOwnProperty.call(_exportNames, key)) return;
+  if (key in exports && exports[key] === _utils[key]) return;
+  Object.defineProperty(exports, key, {
+    enumerable: true,
+    get: function get() {
+      return _utils[key];
+    }
+  });
+});
+
+var _clone = require("./clone");
+
+var _astModuleToModuleContext = require("./transform/ast-module-to-module-context");

backend/frontend/node_modules/@webassemblyjs/ast/lib/node-helpers.js

@@ -0,0 +1,107 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.numberLiteralFromRaw = numberLiteralFromRaw;
+exports.instruction = instruction;
+exports.objectInstruction = objectInstruction;
+exports.withLoc = withLoc;
+exports.withRaw = withRaw;
+exports.funcParam = funcParam;
+exports.indexLiteral = indexLiteral;
+exports.memIndexLiteral = memIndexLiteral;
+
+var _helperNumbers = require("@webassemblyjs/helper-numbers");
+
+var _nodes = require("./nodes");
+
+function numberLiteralFromRaw(rawValue) {
+  var instructionType = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : "i32";
+  var original = rawValue; // Remove numeric separators _
+
+  if (typeof rawValue === "string") {
+    rawValue = rawValue.replace(/_/g, "");
+  }
+
+  if (typeof rawValue === "number") {
+    return (0, _nodes.numberLiteral)(rawValue, String(original));
+  } else {
+    switch (instructionType) {
+      case "i32":
+        {
+          return (0, _nodes.numberLiteral)((0, _helperNumbers.parse32I)(rawValue), String(original));
+        }
+
+      case "u32":
+        {
+          return (0, _nodes.numberLiteral)((0, _helperNumbers.parseU32)(rawValue), String(original));
+        }
+
+      case "i64":
+        {
+          return (0, _nodes.longNumberLiteral)((0, _helperNumbers.parse64I)(rawValue), String(original));
+        }
+
+      case "f32":
+        {
+          return (0, _nodes.floatLiteral)((0, _helperNumbers.parse32F)(rawValue), (0, _helperNumbers.isNanLiteral)(rawValue), (0, _helperNumbers.isInfLiteral)(rawValue), String(original));
+        }
+      // f64
+
+      default:
+        {
+          return (0, _nodes.floatLiteral)((0, _helperNumbers.parse64F)(rawValue), (0, _helperNumbers.isNanLiteral)(rawValue), (0, _helperNumbers.isInfLiteral)(rawValue), String(original));
+        }
+    }
+  }
+}
+
+function instruction(id) {
+  var args = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : [];
+  var namedArgs = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {};
+  return (0, _nodes.instr)(id, undefined, args, namedArgs);
+}
+
+function objectInstruction(id, object) {
+  var args = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : [];
+  var namedArgs = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : {};
+  return (0, _nodes.instr)(id, object, args, namedArgs);
+}
+/**
+ * Decorators
+ */
+
+
+function withLoc(n, end, start) {
+  var loc = {
+    start: start,
+    end: end
+  };
+  n.loc = loc;
+  return n;
+}
+
+function withRaw(n, raw) {
+  n.raw = raw;
+  return n;
+}
+
+function funcParam(valtype, id) {
+  return {
+    id: id,
+    valtype: valtype
+  };
+}
+
+function indexLiteral(value) {
+  // $FlowIgnore
+  var x = numberLiteralFromRaw(value, "u32");
+  return x;
+}
+
+function memIndexLiteral(value) {
+  // $FlowIgnore
+  var x = numberLiteralFromRaw(value, "u32");
+  return x;
+}

backend/frontend/node_modules/@webassemblyjs/ast/lib/node-path.js

@@ -0,0 +1,148 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.createPath = createPath;
+
+function ownKeys(object, enumerableOnly) { var keys = Object.keys(object); if (Object.getOwnPropertySymbols) { var symbols = Object.getOwnPropertySymbols(object); if (enumerableOnly) { symbols = symbols.filter(function (sym) { return Object.getOwnPropertyDescriptor(object, sym).enumerable; }); } keys.push.apply(keys, symbols); } return keys; }
+
+function _objectSpread(target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i] != null ? arguments[i] : {}; if (i % 2) { ownKeys(Object(source), true).forEach(function (key) { _defineProperty(target, key, source[key]); }); } else if (Object.getOwnPropertyDescriptors) { Object.defineProperties(target, Object.getOwnPropertyDescriptors(source)); } else { ownKeys(Object(source)).forEach(function (key) { Object.defineProperty(target, key, Object.getOwnPropertyDescriptor(source, key)); }); } } return target; }
+
+function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
+
+function findParent(_ref, cb) {
+  var parentPath = _ref.parentPath;
+
+  if (parentPath == null) {
+    throw new Error("node is root");
+  }
+
+  var currentPath = parentPath;
+
+  while (cb(currentPath) !== false) {
+    // Hit the root node, stop
+    // $FlowIgnore
+    if (currentPath.parentPath == null) {
+      return null;
+    } // $FlowIgnore
+
+
+    currentPath = currentPath.parentPath;
+  }
+
+  return currentPath.node;
+}
+
+function insertBefore(context, newNode) {
+  return insert(context, newNode);
+}
+
+function insertAfter(context, newNode) {
+  return insert(context, newNode, 1);
+}
+
+function insert(_ref2, newNode) {
+  var node = _ref2.node,
+      inList = _ref2.inList,
+      parentPath = _ref2.parentPath,
+      parentKey = _ref2.parentKey;
+  var indexOffset = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : 0;
+
+  if (!inList) {
+    throw new Error('inList' + " error: " + ("insert can only be used for nodes that are within lists" || "unknown"));
+  }
+
+  if (!(parentPath != null)) {
+    throw new Error('parentPath != null' + " error: " + ("Can not remove root node" || "unknown"));
+  }
+
+  // $FlowIgnore
+  var parentList = parentPath.node[parentKey];
+  var indexInList = parentList.findIndex(function (n) {
+    return n === node;
+  });
+  parentList.splice(indexInList + indexOffset, 0, newNode);
+}
+
+function remove(_ref3) {
+  var node = _ref3.node,
+      parentKey = _ref3.parentKey,
+      parentPath = _ref3.parentPath;
+
+  if (!(parentPath != null)) {
+    throw new Error('parentPath != null' + " error: " + ("Can not remove root node" || "unknown"));
+  }
+
+  // $FlowIgnore
+  var parentNode = parentPath.node; // $FlowIgnore
+
+  var parentProperty = parentNode[parentKey];
+
+  if (Array.isArray(parentProperty)) {
+    // $FlowIgnore
+    parentNode[parentKey] = parentProperty.filter(function (n) {
+      return n !== node;
+    });
+  } else {
+    // $FlowIgnore
+    delete parentNode[parentKey];
+  }
+
+  node._deleted = true;
+}
+
+function stop(context) {
+  context.shouldStop = true;
+}
+
+function replaceWith(context, newNode) {
+  // $FlowIgnore
+  var parentNode = context.parentPath.node; // $FlowIgnore
+
+  var parentProperty = parentNode[context.parentKey];
+
+  if (Array.isArray(parentProperty)) {
+    var indexInList = parentProperty.findIndex(function (n) {
+      return n === context.node;
+    });
+    parentProperty.splice(indexInList, 1, newNode);
+  } else {
+    // $FlowIgnore
+    parentNode[context.parentKey] = newNode;
+  }
+
+  context.node._deleted = true;
+  context.node = newNode;
+} // bind the context to the first argument of node operations
+
+
+function bindNodeOperations(operations, context) {
+  var keys = Object.keys(operations);
+  var boundOperations = {};
+  keys.forEach(function (key) {
+    boundOperations[key] = operations[key].bind(null, context);
+  });
+  return boundOperations;
+}
+
+function createPathOperations(context) {
+  // $FlowIgnore
+  return bindNodeOperations({
+    findParent: findParent,
+    replaceWith: replaceWith,
+    remove: remove,
+    insertBefore: insertBefore,
+    insertAfter: insertAfter,
+    stop: stop
+  }, context);
+}
+
+function createPath(context) {
+  var path = _objectSpread({}, context); // $FlowIgnore
+
+
+  Object.assign(path, createPathOperations(path)); // $FlowIgnore
+
+  return path;
+}

backend/frontend/node_modules/@webassemblyjs/ast/lib/signatures.js

@@ -0,0 +1,207 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.signatures = void 0;
+
+function sign(input, output) {
+  return [input, output];
+}
+
+var u32 = "u32";
+var i32 = "i32";
+var i64 = "i64";
+var f32 = "f32";
+var f64 = "f64";
+
+var vector = function vector(t) {
+  var vecType = [t]; // $FlowIgnore
+
+  vecType.vector = true;
+  return vecType;
+};
+
+var controlInstructions = {
+  unreachable: sign([], []),
+  nop: sign([], []),
+  // block ?
+  // loop ?
+  // if ?
+  // if else ?
+  br: sign([u32], []),
+  br_if: sign([u32], []),
+  br_table: sign(vector(u32), []),
+  "return": sign([], []),
+  call: sign([u32], []),
+  call_indirect: sign([u32], [])
+};
+var parametricInstructions = {
+  drop: sign([], []),
+  select: sign([], [])
+};
+var variableInstructions = {
+  get_local: sign([u32], []),
+  set_local: sign([u32], []),
+  tee_local: sign([u32], []),
+  get_global: sign([u32], []),
+  set_global: sign([u32], [])
+};
+var memoryInstructions = {
+  "i32.load": sign([u32, u32], [i32]),
+  "i64.load": sign([u32, u32], []),
+  "f32.load": sign([u32, u32], []),
+  "f64.load": sign([u32, u32], []),
+  "i32.load8_s": sign([u32, u32], [i32]),
+  "i32.load8_u": sign([u32, u32], [i32]),
+  "i32.load16_s": sign([u32, u32], [i32]),
+  "i32.load16_u": sign([u32, u32], [i32]),
+  "i64.load8_s": sign([u32, u32], [i64]),
+  "i64.load8_u": sign([u32, u32], [i64]),
+  "i64.load16_s": sign([u32, u32], [i64]),
+  "i64.load16_u": sign([u32, u32], [i64]),
+  "i64.load32_s": sign([u32, u32], [i64]),
+  "i64.load32_u": sign([u32, u32], [i64]),
+  "i32.store": sign([u32, u32], []),
+  "i64.store": sign([u32, u32], []),
+  "f32.store": sign([u32, u32], []),
+  "f64.store": sign([u32, u32], []),
+  "i32.store8": sign([u32, u32], []),
+  "i32.store16": sign([u32, u32], []),
+  "i64.store8": sign([u32, u32], []),
+  "i64.store16": sign([u32, u32], []),
+  "i64.store32": sign([u32, u32], []),
+  current_memory: sign([], []),
+  grow_memory: sign([], [])
+};
+var numericInstructions = {
+  "i32.const": sign([i32], [i32]),
+  "i64.const": sign([i64], [i64]),
+  "f32.const": sign([f32], [f32]),
+  "f64.const": sign([f64], [f64]),
+  "i32.eqz": sign([i32], [i32]),
+  "i32.eq": sign([i32, i32], [i32]),
+  "i32.ne": sign([i32, i32], [i32]),
+  "i32.lt_s": sign([i32, i32], [i32]),
+  "i32.lt_u": sign([i32, i32], [i32]),
+  "i32.gt_s": sign([i32, i32], [i32]),
+  "i32.gt_u": sign([i32, i32], [i32]),
+  "i32.le_s": sign([i32, i32], [i32]),
+  "i32.le_u": sign([i32, i32], [i32]),
+  "i32.ge_s": sign([i32, i32], [i32]),
+  "i32.ge_u": sign([i32, i32], [i32]),
+  "i64.eqz": sign([i64], [i64]),
+  "i64.eq": sign([i64, i64], [i32]),
+  "i64.ne": sign([i64, i64], [i32]),
+  "i64.lt_s": sign([i64, i64], [i32]),
+  "i64.lt_u": sign([i64, i64], [i32]),
+  "i64.gt_s": sign([i64, i64], [i32]),
+  "i64.gt_u": sign([i64, i64], [i32]),
+  "i64.le_s": sign([i64, i64], [i32]),
+  "i64.le_u": sign([i64, i64], [i32]),
+  "i64.ge_s": sign([i64, i64], [i32]),
+  "i64.ge_u": sign([i64, i64], [i32]),
+  "f32.eq": sign([f32, f32], [i32]),
+  "f32.ne": sign([f32, f32], [i32]),
+  "f32.lt": sign([f32, f32], [i32]),
+  "f32.gt": sign([f32, f32], [i32]),
+  "f32.le": sign([f32, f32], [i32]),
+  "f32.ge": sign([f32, f32], [i32]),
+  "f64.eq": sign([f64, f64], [i32]),
+  "f64.ne": sign([f64, f64], [i32]),
+  "f64.lt": sign([f64, f64], [i32]),
+  "f64.gt": sign([f64, f64], [i32]),
+  "f64.le": sign([f64, f64], [i32]),
+  "f64.ge": sign([f64, f64], [i32]),
+  "i32.clz": sign([i32], [i32]),
+  "i32.ctz": sign([i32], [i32]),
+  "i32.popcnt": sign([i32], [i32]),
+  "i32.add": sign([i32, i32], [i32]),
+  "i32.sub": sign([i32, i32], [i32]),
+  "i32.mul": sign([i32, i32], [i32]),
+  "i32.div_s": sign([i32, i32], [i32]),
+  "i32.div_u": sign([i32, i32], [i32]),
+  "i32.rem_s": sign([i32, i32], [i32]),
+  "i32.rem_u": sign([i32, i32], [i32]),
+  "i32.and": sign([i32, i32], [i32]),
+  "i32.or": sign([i32, i32], [i32]),
+  "i32.xor": sign([i32, i32], [i32]),
+  "i32.shl": sign([i32, i32], [i32]),
+  "i32.shr_s": sign([i32, i32], [i32]),
+  "i32.shr_u": sign([i32, i32], [i32]),
+  "i32.rotl": sign([i32, i32], [i32]),
+  "i32.rotr": sign([i32, i32], [i32]),
+  "i64.clz": sign([i64], [i64]),
+  "i64.ctz": sign([i64], [i64]),
+  "i64.popcnt": sign([i64], [i64]),
+  "i64.add": sign([i64, i64], [i64]),
+  "i64.sub": sign([i64, i64], [i64]),
+  "i64.mul": sign([i64, i64], [i64]),
+  "i64.div_s": sign([i64, i64], [i64]),
+  "i64.div_u": sign([i64, i64], [i64]),
+  "i64.rem_s": sign([i64, i64], [i64]),
+  "i64.rem_u": sign([i64, i64], [i64]),
+  "i64.and": sign([i64, i64], [i64]),
+  "i64.or": sign([i64, i64], [i64]),
+  "i64.xor": sign([i64, i64], [i64]),
+  "i64.shl": sign([i64, i64], [i64]),
+  "i64.shr_s": sign([i64, i64], [i64]),
+  "i64.shr_u": sign([i64, i64], [i64]),
+  "i64.rotl": sign([i64, i64], [i64]),
+  "i64.rotr": sign([i64, i64], [i64]),
+  "f32.abs": sign([f32], [f32]),
+  "f32.neg": sign([f32], [f32]),
+  "f32.ceil": sign([f32], [f32]),
+  "f32.floor": sign([f32], [f32]),
+  "f32.trunc": sign([f32], [f32]),
+  "f32.nearest": sign([f32], [f32]),
+  "f32.sqrt": sign([f32], [f32]),
+  "f32.add": sign([f32, f32], [f32]),
+  "f32.sub": sign([f32, f32], [f32]),
+  "f32.mul": sign([f32, f32], [f32]),
+  "f32.div": sign([f32, f32], [f32]),
+  "f32.min": sign([f32, f32], [f32]),
+  "f32.max": sign([f32, f32], [f32]),
+  "f32.copysign": sign([f32, f32], [f32]),
+  "f64.abs": sign([f64], [f64]),
+  "f64.neg": sign([f64], [f64]),
+  "f64.ceil": sign([f64], [f64]),
+  "f64.floor": sign([f64], [f64]),
+  "f64.trunc": sign([f64], [f64]),
+  "f64.nearest": sign([f64], [f64]),
+  "f64.sqrt": sign([f64], [f64]),
+  "f64.add": sign([f64, f64], [f64]),
+  "f64.sub": sign([f64, f64], [f64]),
+  "f64.mul": sign([f64, f64], [f64]),
+  "f64.div": sign([f64, f64], [f64]),
+  "f64.min": sign([f64, f64], [f64]),
+  "f64.max": sign([f64, f64], [f64]),
+  "f64.copysign": sign([f64, f64], [f64]),
+  "i32.wrap/i64": sign([i64], [i32]),
+  "i32.trunc_s/f32": sign([f32], [i32]),
+  "i32.trunc_u/f32": sign([f32], [i32]),
+  "i32.trunc_s/f64": sign([f32], [i32]),
+  "i32.trunc_u/f64": sign([f64], [i32]),
+  "i64.extend_s/i32": sign([i32], [i64]),
+  "i64.extend_u/i32": sign([i32], [i64]),
+  "i64.trunc_s/f32": sign([f32], [i64]),
+  "i64.trunc_u/f32": sign([f32], [i64]),
+  "i64.trunc_s/f64": sign([f64], [i64]),
+  "i64.trunc_u/f64": sign([f64], [i64]),
+  "f32.convert_s/i32": sign([i32], [f32]),
+  "f32.convert_u/i32": sign([i32], [f32]),
+  "f32.convert_s/i64": sign([i64], [f32]),
+  "f32.convert_u/i64": sign([i64], [f32]),
+  "f32.demote/f64": sign([f64], [f32]),
+  "f64.convert_s/i32": sign([i32], [f64]),
+  "f64.convert_u/i32": sign([i32], [f64]),
+  "f64.convert_s/i64": sign([i64], [f64]),
+  "f64.convert_u/i64": sign([i64], [f64]),
+  "f64.promote/f32": sign([f32], [f64]),
+  "i32.reinterpret/f32": sign([f32], [i32]),
+  "i64.reinterpret/f64": sign([f64], [i64]),
+  "f32.reinterpret/i32": sign([i32], [f32]),
+  "f64.reinterpret/i64": sign([i64], [f64])
+};
+var signatures = Object.assign({}, controlInstructions, parametricInstructions, variableInstructions, memoryInstructions, numericInstructions);
+exports.signatures = signatures;

backend/frontend/node_modules/@webassemblyjs/ast/lib/transform/ast-module-to-module-context/index.js

@@ -0,0 +1,389 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.moduleContextFromModuleAST = moduleContextFromModuleAST;
+exports.ModuleContext = void 0;
+
+var _nodes = require("../../nodes.js");
+
+function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
+
+function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }
+
+function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }
+
+function moduleContextFromModuleAST(m) {
+  var moduleContext = new ModuleContext();
+
+  if (!(m.type === "Module")) {
+    throw new Error('m.type === "Module"' + " error: " + (undefined || "unknown"));
+  }
+
+  m.fields.forEach(function (field) {
+    switch (field.type) {
+      case "Start":
+        {
+          moduleContext.setStart(field.index);
+          break;
+        }
+
+      case "TypeInstruction":
+        {
+          moduleContext.addType(field);
+          break;
+        }
+
+      case "Func":
+        {
+          moduleContext.addFunction(field);
+          break;
+        }
+
+      case "Global":
+        {
+          moduleContext.defineGlobal(field);
+          break;
+        }
+
+      case "ModuleImport":
+        {
+          switch (field.descr.type) {
+            case "GlobalType":
+              {
+                moduleContext.importGlobal(field.descr.valtype, field.descr.mutability);
+                break;
+              }
+
+            case "Memory":
+              {
+                moduleContext.addMemory(field.descr.limits.min, field.descr.limits.max);
+                break;
+              }
+
+            case "FuncImportDescr":
+              {
+                moduleContext.importFunction(field.descr);
+                break;
+              }
+
+            case "Table":
+              {
+                // FIXME(sven): not implemented yet
+                break;
+              }
+
+            default:
+              throw new Error("Unsupported ModuleImport of type " + JSON.stringify(field.descr.type));
+          }
+
+          break;
+        }
+
+      case "Memory":
+        {
+          moduleContext.addMemory(field.limits.min, field.limits.max);
+          break;
+        }
+    }
+  });
+  return moduleContext;
+}
+/**
+ * Module context for type checking
+ */
+
+
+var ModuleContext = /*#__PURE__*/function () {
+  function ModuleContext() {
+    _classCallCheck(this, ModuleContext);
+
+    this.funcs = [];
+    this.funcsOffsetByIdentifier = [];
+    this.types = [];
+    this.globals = [];
+    this.globalsOffsetByIdentifier = [];
+    this.mems = []; // Current stack frame
+
+    this.locals = [];
+    this.labels = [];
+    this["return"] = [];
+    this.debugName = "unknown";
+    this.start = null;
+  }
+  /**
+   * Set start segment
+   */
+
+
+  _createClass(ModuleContext, [{
+    key: "setStart",
+    value: function setStart(index) {
+      this.start = index.value;
+    }
+    /**
+     * Get start function
+     */
+
+  }, {
+    key: "getStart",
+    value: function getStart() {
+      return this.start;
+    }
+    /**
+     * Reset the active stack frame
+     */
+
+  }, {
+    key: "newContext",
+    value: function newContext(debugName, expectedResult) {
+      this.locals = [];
+      this.labels = [expectedResult];
+      this["return"] = expectedResult;
+      this.debugName = debugName;
+    }
+    /**
+     * Functions
+     */
+
+  }, {
+    key: "addFunction",
+    value: function addFunction(func) {
+      /* eslint-disable */
+      // $FlowIgnore
+      var _ref = func.signature || {},
+          _ref$params = _ref.params,
+          args = _ref$params === void 0 ? [] : _ref$params,
+          _ref$results = _ref.results,
+          result = _ref$results === void 0 ? [] : _ref$results;
+      /* eslint-enable */
+
+
+      args = args.map(function (arg) {
+        return arg.valtype;
+      });
+      this.funcs.push({
+        args: args,
+        result: result
+      });
+
+      if (typeof func.name !== "undefined") {
+        // $FlowIgnore
+        this.funcsOffsetByIdentifier[func.name.value] = this.funcs.length - 1;
+      }
+    }
+  }, {
+    key: "importFunction",
+    value: function importFunction(funcimport) {
+      if ((0, _nodes.isSignature)(funcimport.signature)) {
+        // eslint-disable-next-line prefer-const
+        var _funcimport$signature = funcimport.signature,
+            args = _funcimport$signature.params,
+            result = _funcimport$signature.results;
+        args = args.map(function (arg) {
+          return arg.valtype;
+        });
+        this.funcs.push({
+          args: args,
+          result: result
+        });
+      } else {
+        if (!(0, _nodes.isNumberLiteral)(funcimport.signature)) {
+          throw new Error('isNumberLiteral(funcimport.signature)' + " error: " + (undefined || "unknown"));
+        }
+
+        var typeId = funcimport.signature.value;
+
+        if (!this.hasType(typeId)) {
+          throw new Error('this.hasType(typeId)' + " error: " + (undefined || "unknown"));
+        }
+
+        var signature = this.getType(typeId);
+        this.funcs.push({
+          args: signature.params.map(function (arg) {
+            return arg.valtype;
+          }),
+          result: signature.results
+        });
+      }
+
+      if (typeof funcimport.id !== "undefined") {
+        // imports are first, we can assume their index in the array
+        this.funcsOffsetByIdentifier[funcimport.id.value] = this.funcs.length - 1;
+      }
+    }
+  }, {
+    key: "hasFunction",
+    value: function hasFunction(index) {
+      return typeof this.getFunction(index) !== "undefined";
+    }
+  }, {
+    key: "getFunction",
+    value: function getFunction(index) {
+      if (typeof index !== "number") {
+        throw new Error("getFunction only supported for number index");
+      }
+
+      return this.funcs[index];
+    }
+  }, {
+    key: "getFunctionOffsetByIdentifier",
+    value: function getFunctionOffsetByIdentifier(name) {
+      if (!(typeof name === "string")) {
+        throw new Error('typeof name === "string"' + " error: " + (undefined || "unknown"));
+      }
+
+      return this.funcsOffsetByIdentifier[name];
+    }
+    /**
+     * Labels
+     */
+
+  }, {
+    key: "addLabel",
+    value: function addLabel(result) {
+      this.labels.unshift(result);
+    }
+  }, {
+    key: "hasLabel",
+    value: function hasLabel(index) {
+      return this.labels.length > index && index >= 0;
+    }
+  }, {
+    key: "getLabel",
+    value: function getLabel(index) {
+      return this.labels[index];
+    }
+  }, {
+    key: "popLabel",
+    value: function popLabel() {
+      this.labels.shift();
+    }
+    /**
+     * Locals
+     */
+
+  }, {
+    key: "hasLocal",
+    value: function hasLocal(index) {
+      return typeof this.getLocal(index) !== "undefined";
+    }
+  }, {
+    key: "getLocal",
+    value: function getLocal(index) {
+      return this.locals[index];
+    }
+  }, {
+    key: "addLocal",
+    value: function addLocal(type) {
+      this.locals.push(type);
+    }
+    /**
+     * Types
+     */
+
+  }, {
+    key: "addType",
+    value: function addType(type) {
+      if (!(type.functype.type === "Signature")) {
+        throw new Error('type.functype.type === "Signature"' + " error: " + (undefined || "unknown"));
+      }
+
+      this.types.push(type.functype);
+    }
+  }, {
+    key: "hasType",
+    value: function hasType(index) {
+      return this.types[index] !== undefined;
+    }
+  }, {
+    key: "getType",
+    value: function getType(index) {
+      return this.types[index];
+    }
+    /**
+     * Globals
+     */
+
+  }, {
+    key: "hasGlobal",
+    value: function hasGlobal(index) {
+      return this.globals.length > index && index >= 0;
+    }
+  }, {
+    key: "getGlobal",
+    value: function getGlobal(index) {
+      return this.globals[index].type;
+    }
+  }, {
+    key: "getGlobalOffsetByIdentifier",
+    value: function getGlobalOffsetByIdentifier(name) {
+      if (!(typeof name === "string")) {
+        throw new Error('typeof name === "string"' + " error: " + (undefined || "unknown"));
+      }
+
+      // $FlowIgnore
+      return this.globalsOffsetByIdentifier[name];
+    }
+  }, {
+    key: "defineGlobal",
+    value: function defineGlobal(global) {
+      var type = global.globalType.valtype;
+      var mutability = global.globalType.mutability;
+      this.globals.push({
+        type: type,
+        mutability: mutability
+      });
+
+      if (typeof global.name !== "undefined") {
+        // $FlowIgnore
+        this.globalsOffsetByIdentifier[global.name.value] = this.globals.length - 1;
+      }
+    }
+  }, {
+    key: "importGlobal",
+    value: function importGlobal(type, mutability) {
+      this.globals.push({
+        type: type,
+        mutability: mutability
+      });
+    }
+  }, {
+    key: "isMutableGlobal",
+    value: function isMutableGlobal(index) {
+      return this.globals[index].mutability === "var";
+    }
+  }, {
+    key: "isImmutableGlobal",
+    value: function isImmutableGlobal(index) {
+      return this.globals[index].mutability === "const";
+    }
+    /**
+     * Memories
+     */
+
+  }, {
+    key: "hasMemory",
+    value: function hasMemory(index) {
+      return this.mems.length > index && index >= 0;
+    }
+  }, {
+    key: "addMemory",
+    value: function addMemory(min, max) {
+      this.mems.push({
+        min: min,
+        max: max
+      });
+    }
+  }, {
+    key: "getMemory",
+    value: function getMemory(index) {
+      return this.mems[index];
+    }
+  }]);
+
+  return ModuleContext;
+}();
+
+exports.ModuleContext = ModuleContext;

backend/frontend/node_modules/@webassemblyjs/ast/lib/transform/denormalize-type-references/index.js

@@ -0,0 +1,83 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.transform = transform;
+
+var t = require("../../index"); // func and call_indirect instructions can either define a signature inline, or
+// reference a signature, e.g.
+//
+// ;; inline signature
+// (func (result i64)
+//   (i64.const 2)
+// )
+// ;; signature reference
+// (type (func (result i64)))
+// (func (type 0)
+//   (i64.const 2))
+// )
+//
+// this AST transform denormalises the type references, making all signatures within the module
+// inline.
+
+
+function transform(ast) {
+  var typeInstructions = [];
+  t.traverse(ast, {
+    TypeInstruction: function TypeInstruction(_ref) {
+      var node = _ref.node;
+      typeInstructions.push(node);
+    }
+  });
+
+  if (!typeInstructions.length) {
+    return;
+  }
+
+  function denormalizeSignature(signature) {
+    // signature referenced by identifier
+    if (signature.type === "Identifier") {
+      var identifier = signature;
+      var typeInstruction = typeInstructions.find(function (t) {
+        return t.id.type === identifier.type && t.id.value === identifier.value;
+      });
+
+      if (!typeInstruction) {
+        throw new Error("A type instruction reference was not found ".concat(JSON.stringify(signature)));
+      }
+
+      return typeInstruction.functype;
+    } // signature referenced by index
+
+
+    if (signature.type === "NumberLiteral") {
+      var signatureRef = signature;
+      var _typeInstruction = typeInstructions[signatureRef.value];
+      return _typeInstruction.functype;
+    }
+
+    return signature;
+  }
+
+  t.traverse(ast, {
+    Func: function (_Func) {
+      function Func(_x) {
+        return _Func.apply(this, arguments);
+      }
+
+      Func.toString = function () {
+        return _Func.toString();
+      };
+
+      return Func;
+    }(function (_ref2) {
+      var node = _ref2.node;
+      node.signature = denormalizeSignature(node.signature);
+    }),
+    CallIndirectInstruction: function CallIndirectInstruction(_ref3) {
+      var node = _ref3.node;
+      node.signature = denormalizeSignature(node.signature);
+    }
+  });
+}

backend/frontend/node_modules/@webassemblyjs/ast/lib/transform/wast-identifier-to-index/index.js

@@ -0,0 +1,238 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.transform = transform;
+
+var _index = require("../../index");
+
+var _astModuleToModuleContext = require("../ast-module-to-module-context");
+
+function _typeof(obj) { "@babel/helpers - typeof"; if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }
+
+function _slicedToArray(arr, i) { return _arrayWithHoles(arr) || _iterableToArrayLimit(arr, i) || _unsupportedIterableToArray(arr, i) || _nonIterableRest(); }
+
+function _nonIterableRest() { throw new TypeError("Invalid attempt to destructure non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); }
+
+function _unsupportedIterableToArray(o, minLen) { if (!o) return; if (typeof o === "string") return _arrayLikeToArray(o, minLen); var n = Object.prototype.toString.call(o).slice(8, -1); if (n === "Object" && o.constructor) n = o.constructor.name; if (n === "Map" || n === "Set") return Array.from(o); if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen); }
+
+function _arrayLikeToArray(arr, len) { if (len == null || len > arr.length) len = arr.length; for (var i = 0, arr2 = new Array(len); i < len; i++) { arr2[i] = arr[i]; } return arr2; }
+
+function _iterableToArrayLimit(arr, i) { var _i = arr == null ? null : typeof Symbol !== "undefined" && arr[Symbol.iterator] || arr["@@iterator"]; if (_i == null) return; var _arr = []; var _n = true; var _d = false; var _s, _e; try { for (_i = _i.call(arr); !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i["return"] != null) _i["return"](); } finally { if (_d) throw _e; } } return _arr; }
+
+function _arrayWithHoles(arr) { if (Array.isArray(arr)) return arr; }
+
+// FIXME(sven): do the same with all block instructions, must be more generic here
+function newUnexpectedFunction(i) {
+  return new Error("unknown function at offset: " + i);
+}
+
+function transform(ast) {
+  var module = null;
+  (0, _index.traverse)(ast, {
+    Module: function (_Module) {
+      function Module(_x) {
+        return _Module.apply(this, arguments);
+      }
+
+      Module.toString = function () {
+        return _Module.toString();
+      };
+
+      return Module;
+    }(function (path) {
+      module = path.node;
+    })
+  });
+
+  if (module == null) {
+    throw new Error("Module not foudn in program");
+  }
+
+  var moduleContext = (0, _astModuleToModuleContext.moduleContextFromModuleAST)(module); // Transform the actual instruction in function bodies
+
+  (0, _index.traverse)(ast, {
+    Func: function (_Func) {
+      function Func(_x2) {
+        return _Func.apply(this, arguments);
+      }
+
+      Func.toString = function () {
+        return _Func.toString();
+      };
+
+      return Func;
+    }(function (path) {
+      transformFuncPath(path, moduleContext);
+    }),
+    Start: function (_Start) {
+      function Start(_x3) {
+        return _Start.apply(this, arguments);
+      }
+
+      Start.toString = function () {
+        return _Start.toString();
+      };
+
+      return Start;
+    }(function (path) {
+      var index = path.node.index;
+
+      if ((0, _index.isIdentifier)(index) === true) {
+        var offsetInModule = moduleContext.getFunctionOffsetByIdentifier(index.value);
+
+        if (typeof offsetInModule === "undefined") {
+          throw newUnexpectedFunction(index.value);
+        } // Replace the index Identifier
+        // $FlowIgnore: reference?
+
+
+        path.node.index = (0, _index.numberLiteralFromRaw)(offsetInModule);
+      }
+    })
+  });
+}
+
+function transformFuncPath(funcPath, moduleContext) {
+  var funcNode = funcPath.node;
+  var signature = funcNode.signature;
+
+  if (signature.type !== "Signature") {
+    throw new Error("Function signatures must be denormalised before execution");
+  }
+
+  var params = signature.params; // Add func locals in the context
+
+  params.forEach(function (p) {
+    return moduleContext.addLocal(p.valtype);
+  });
+  (0, _index.traverse)(funcNode, {
+    Instr: function (_Instr) {
+      function Instr(_x4) {
+        return _Instr.apply(this, arguments);
+      }
+
+      Instr.toString = function () {
+        return _Instr.toString();
+      };
+
+      return Instr;
+    }(function (instrPath) {
+      var instrNode = instrPath.node;
+      /**
+       * Local access
+       */
+
+      if (instrNode.id === "get_local" || instrNode.id === "set_local" || instrNode.id === "tee_local") {
+        var _instrNode$args = _slicedToArray(instrNode.args, 1),
+            firstArg = _instrNode$args[0];
+
+        if (firstArg.type === "Identifier") {
+          var offsetInParams = params.findIndex(function (_ref) {
+            var id = _ref.id;
+            return id === firstArg.value;
+          });
+
+          if (offsetInParams === -1) {
+            throw new Error("".concat(firstArg.value, " not found in ").concat(instrNode.id, ": not declared in func params"));
+          } // Replace the Identifer node by our new NumberLiteral node
+
+
+          instrNode.args[0] = (0, _index.numberLiteralFromRaw)(offsetInParams);
+        }
+      }
+      /**
+       * Global access
+       */
+
+
+      if (instrNode.id === "get_global" || instrNode.id === "set_global") {
+        var _instrNode$args2 = _slicedToArray(instrNode.args, 1),
+            _firstArg = _instrNode$args2[0];
+
+        if ((0, _index.isIdentifier)(_firstArg) === true) {
+          var globalOffset = moduleContext.getGlobalOffsetByIdentifier( // $FlowIgnore: reference?
+          _firstArg.value);
+
+          if (typeof globalOffset === "undefined") {
+            // $FlowIgnore: reference?
+            throw new Error("global ".concat(_firstArg.value, " not found in module"));
+          } // Replace the Identifer node by our new NumberLiteral node
+
+
+          instrNode.args[0] = (0, _index.numberLiteralFromRaw)(globalOffset);
+        }
+      }
+      /**
+       * Labels lookup
+       */
+
+
+      if (instrNode.id === "br") {
+        var _instrNode$args3 = _slicedToArray(instrNode.args, 1),
+            _firstArg2 = _instrNode$args3[0];
+
+        if ((0, _index.isIdentifier)(_firstArg2) === true) {
+          // if the labels is not found it is going to be replaced with -1
+          // which is invalid.
+          var relativeBlockCount = -1; // $FlowIgnore: reference?
+
+          instrPath.findParent(function (_ref2) {
+            var node = _ref2.node;
+
+            if ((0, _index.isBlock)(node)) {
+              relativeBlockCount++; // $FlowIgnore: reference?
+
+              var name = node.label || node.name;
+
+              if (_typeof(name) === "object") {
+                // $FlowIgnore: isIdentifier ensures that
+                if (name.value === _firstArg2.value) {
+                  // Found it
+                  return false;
+                }
+              }
+            }
+
+            if ((0, _index.isFunc)(node)) {
+              return false;
+            }
+          }); // Replace the Identifer node by our new NumberLiteral node
+
+          instrNode.args[0] = (0, _index.numberLiteralFromRaw)(relativeBlockCount);
+        }
+      }
+    }),
+
+    /**
+     * Func lookup
+     */
+    CallInstruction: function (_CallInstruction) {
+      function CallInstruction(_x5) {
+        return _CallInstruction.apply(this, arguments);
+      }
+
+      CallInstruction.toString = function () {
+        return _CallInstruction.toString();
+      };
+
+      return CallInstruction;
+    }(function (_ref3) {
+      var node = _ref3.node;
+      var index = node.index;
+
+      if ((0, _index.isIdentifier)(index) === true) {
+        var offsetInModule = moduleContext.getFunctionOffsetByIdentifier(index.value);
+
+        if (typeof offsetInModule === "undefined") {
+          throw newUnexpectedFunction(index.value);
+        } // Replace the index Identifier
+        // $FlowIgnore: reference?
+
+
+        node.index = (0, _index.numberLiteralFromRaw)(offsetInModule);
+      }
+    })
+  });
+}

backend/frontend/node_modules/@webassemblyjs/ast/lib/traverse.js

@@ -0,0 +1,105 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.traverse = traverse;
+
+var _nodePath = require("./node-path");
+
+var _nodes = require("./nodes");
+
+// recursively walks the AST starting at the given node. The callback is invoked for
+// and object that has a 'type' property.
+function walk(context, callback) {
+  var stop = false;
+
+  function innerWalk(context, callback) {
+    if (stop) {
+      return;
+    }
+
+    var node = context.node;
+
+    if (node === undefined) {
+      console.warn("traversing with an empty context");
+      return;
+    }
+
+    if (node._deleted === true) {
+      return;
+    }
+
+    var path = (0, _nodePath.createPath)(context);
+    callback(node.type, path);
+
+    if (path.shouldStop) {
+      stop = true;
+      return;
+    }
+
+    Object.keys(node).forEach(function (prop) {
+      var value = node[prop];
+
+      if (value === null || value === undefined) {
+        return;
+      }
+
+      var valueAsArray = Array.isArray(value) ? value : [value];
+      valueAsArray.forEach(function (childNode) {
+        if (typeof childNode.type === "string") {
+          var childContext = {
+            node: childNode,
+            parentKey: prop,
+            parentPath: path,
+            shouldStop: false,
+            inList: Array.isArray(value)
+          };
+          innerWalk(childContext, callback);
+        }
+      });
+    });
+  }
+
+  innerWalk(context, callback);
+}
+
+var noop = function noop() {};
+
+function traverse(node, visitors) {
+  var before = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : noop;
+  var after = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : noop;
+  Object.keys(visitors).forEach(function (visitor) {
+    if (!_nodes.nodeAndUnionTypes.includes(visitor)) {
+      throw new Error("Unexpected visitor ".concat(visitor));
+    }
+  });
+  var context = {
+    node: node,
+    inList: false,
+    shouldStop: false,
+    parentPath: null,
+    parentKey: null
+  };
+  walk(context, function (type, path) {
+    if (typeof visitors[type] === "function") {
+      before(type, path);
+      visitors[type](path);
+      after(type, path);
+    }
+
+    var unionTypes = _nodes.unionTypesMap[type];
+
+    if (!unionTypes) {
+      throw new Error("Unexpected node type ".concat(type));
+    }
+
+    unionTypes.forEach(function (unionType) {
+      if (typeof visitors[unionType] === "function") {
+        before(unionType, path);
+        visitors[unionType](path);
+        after(unionType, path);
+      }
+    });
+  });
+}

backend/frontend/node_modules/@webassemblyjs/ast/lib/types/basic.js

@@ -0,0 +1 @@
+"use strict";

backend/frontend/node_modules/@webassemblyjs/ast/lib/types/nodes.js

@@ -0,0 +1 @@
+"use strict";

backend/frontend/node_modules/@webassemblyjs/ast/lib/types/traverse.js

@@ -0,0 +1 @@
+"use strict";

backend/frontend/node_modules/@webassemblyjs/ast/lib/utils.js

@@ -0,0 +1,315 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.isAnonymous = isAnonymous;
+exports.getSectionMetadata = getSectionMetadata;
+exports.getSectionMetadatas = getSectionMetadatas;
+exports.sortSectionMetadata = sortSectionMetadata;
+exports.orderedInsertNode = orderedInsertNode;
+exports.assertHasLoc = assertHasLoc;
+exports.getEndOfSection = getEndOfSection;
+exports.shiftLoc = shiftLoc;
+exports.shiftSection = shiftSection;
+exports.signatureForOpcode = signatureForOpcode;
+exports.getUniqueNameGenerator = getUniqueNameGenerator;
+exports.getStartByteOffset = getStartByteOffset;
+exports.getEndByteOffset = getEndByteOffset;
+exports.getFunctionBeginingByteOffset = getFunctionBeginingByteOffset;
+exports.getEndBlockByteOffset = getEndBlockByteOffset;
+exports.getStartBlockByteOffset = getStartBlockByteOffset;
+
+var _signatures = require("./signatures");
+
+var _traverse = require("./traverse");
+
+var _helperWasmBytecode = _interopRequireWildcard(require("@webassemblyjs/helper-wasm-bytecode"));
+
+function _getRequireWildcardCache(nodeInterop) { if (typeof WeakMap !== "function") return null; var cacheBabelInterop = new WeakMap(); var cacheNodeInterop = new WeakMap(); return (_getRequireWildcardCache = function _getRequireWildcardCache(nodeInterop) { return nodeInterop ? cacheNodeInterop : cacheBabelInterop; })(nodeInterop); }
+
+function _interopRequireWildcard(obj, nodeInterop) { if (!nodeInterop && obj && obj.__esModule) { return obj; } if (obj === null || _typeof(obj) !== "object" && typeof obj !== "function") { return { "default": obj }; } var cache = _getRequireWildcardCache(nodeInterop); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (key !== "default" && Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj["default"] = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
+
+function _slicedToArray(arr, i) { return _arrayWithHoles(arr) || _iterableToArrayLimit(arr, i) || _unsupportedIterableToArray(arr, i) || _nonIterableRest(); }
+
+function _nonIterableRest() { throw new TypeError("Invalid attempt to destructure non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); }
+
+function _unsupportedIterableToArray(o, minLen) { if (!o) return; if (typeof o === "string") return _arrayLikeToArray(o, minLen); var n = Object.prototype.toString.call(o).slice(8, -1); if (n === "Object" && o.constructor) n = o.constructor.name; if (n === "Map" || n === "Set") return Array.from(o); if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen); }
+
+function _arrayLikeToArray(arr, len) { if (len == null || len > arr.length) len = arr.length; for (var i = 0, arr2 = new Array(len); i < len; i++) { arr2[i] = arr[i]; } return arr2; }
+
+function _iterableToArrayLimit(arr, i) { var _i = arr == null ? null : typeof Symbol !== "undefined" && arr[Symbol.iterator] || arr["@@iterator"]; if (_i == null) return; var _arr = []; var _n = true; var _d = false; var _s, _e; try { for (_i = _i.call(arr); !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i["return"] != null) _i["return"](); } finally { if (_d) throw _e; } } return _arr; }
+
+function _arrayWithHoles(arr) { if (Array.isArray(arr)) return arr; }
+
+function _typeof(obj) { "@babel/helpers - typeof"; if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }
+
+function isAnonymous(ident) {
+  return ident.raw === "";
+}
+
+function getSectionMetadata(ast, name) {
+  var section;
+  (0, _traverse.traverse)(ast, {
+    SectionMetadata: function (_SectionMetadata) {
+      function SectionMetadata(_x) {
+        return _SectionMetadata.apply(this, arguments);
+      }
+
+      SectionMetadata.toString = function () {
+        return _SectionMetadata.toString();
+      };
+
+      return SectionMetadata;
+    }(function (_ref) {
+      var node = _ref.node;
+
+      if (node.section === name) {
+        section = node;
+      }
+    })
+  });
+  return section;
+}
+
+function getSectionMetadatas(ast, name) {
+  var sections = [];
+  (0, _traverse.traverse)(ast, {
+    SectionMetadata: function (_SectionMetadata2) {
+      function SectionMetadata(_x2) {
+        return _SectionMetadata2.apply(this, arguments);
+      }
+
+      SectionMetadata.toString = function () {
+        return _SectionMetadata2.toString();
+      };
+
+      return SectionMetadata;
+    }(function (_ref2) {
+      var node = _ref2.node;
+
+      if (node.section === name) {
+        sections.push(node);
+      }
+    })
+  });
+  return sections;
+}
+
+function sortSectionMetadata(m) {
+  if (m.metadata == null) {
+    console.warn("sortSectionMetadata: no metadata to sort");
+    return;
+  } // $FlowIgnore
+
+
+  m.metadata.sections.sort(function (a, b) {
+    var aId = _helperWasmBytecode["default"].sections[a.section];
+    var bId = _helperWasmBytecode["default"].sections[b.section];
+
+    if (typeof aId !== "number" || typeof bId !== "number") {
+      throw new Error("Section id not found");
+    }
+
+    return aId - bId;
+  });
+}
+
+function orderedInsertNode(m, n) {
+  assertHasLoc(n);
+  var didInsert = false;
+
+  if (n.type === "ModuleExport") {
+    m.fields.push(n);
+    return;
+  }
+
+  m.fields = m.fields.reduce(function (acc, field) {
+    var fieldEndCol = Infinity;
+
+    if (field.loc != null) {
+      // $FlowIgnore
+      fieldEndCol = field.loc.end.column;
+    } // $FlowIgnore: assertHasLoc ensures that
+
+
+    if (didInsert === false && n.loc.start.column < fieldEndCol) {
+      didInsert = true;
+      acc.push(n);
+    }
+
+    acc.push(field);
+    return acc;
+  }, []); // Handles empty modules or n is the last element
+
+  if (didInsert === false) {
+    m.fields.push(n);
+  }
+}
+
+function assertHasLoc(n) {
+  if (n.loc == null || n.loc.start == null || n.loc.end == null) {
+    throw new Error("Internal failure: node (".concat(JSON.stringify(n.type), ") has no location information"));
+  }
+}
+
+function getEndOfSection(s) {
+  assertHasLoc(s.size);
+  return s.startOffset + s.size.value + (s.size.loc.end.column - s.size.loc.start.column);
+}
+
+function shiftLoc(node, delta) {
+  // $FlowIgnore
+  node.loc.start.column += delta; // $FlowIgnore
+
+  node.loc.end.column += delta;
+}
+
+function shiftSection(ast, node, delta) {
+  if (node.type !== "SectionMetadata") {
+    throw new Error("Can not shift node " + JSON.stringify(node.type));
+  }
+
+  node.startOffset += delta;
+
+  if (_typeof(node.size.loc) === "object") {
+    shiftLoc(node.size, delta);
+  } // Custom sections doesn't have vectorOfSize
+
+
+  if (_typeof(node.vectorOfSize) === "object" && _typeof(node.vectorOfSize.loc) === "object") {
+    shiftLoc(node.vectorOfSize, delta);
+  }
+
+  var sectionName = node.section; // shift node locations within that section
+
+  (0, _traverse.traverse)(ast, {
+    Node: function Node(_ref3) {
+      var node = _ref3.node;
+      var section = (0, _helperWasmBytecode.getSectionForNode)(node);
+
+      if (section === sectionName && _typeof(node.loc) === "object") {
+        shiftLoc(node, delta);
+      }
+    }
+  });
+}
+
+function signatureForOpcode(object, name) {
+  var opcodeName = name;
+
+  if (object !== undefined && object !== "") {
+    opcodeName = object + "." + name;
+  }
+
+  var sign = _signatures.signatures[opcodeName];
+
+  if (sign == undefined) {
+    // TODO: Uncomment this when br_table and others has been done
+    //throw new Error("Invalid opcode: "+opcodeName);
+    return [object, object];
+  }
+
+  return sign[0];
+}
+
+function getUniqueNameGenerator() {
+  var inc = {};
+  return function () {
+    var prefix = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : "temp";
+
+    if (!(prefix in inc)) {
+      inc[prefix] = 0;
+    } else {
+      inc[prefix] = inc[prefix] + 1;
+    }
+
+    return prefix + "_" + inc[prefix];
+  };
+}
+
+function getStartByteOffset(n) {
+  // $FlowIgnore
+  if (typeof n.loc === "undefined" || typeof n.loc.start === "undefined") {
+    throw new Error( // $FlowIgnore
+    "Can not get byte offset without loc informations, node: " + String(n.id));
+  }
+
+  return n.loc.start.column;
+}
+
+function getEndByteOffset(n) {
+  // $FlowIgnore
+  if (typeof n.loc === "undefined" || typeof n.loc.end === "undefined") {
+    throw new Error("Can not get byte offset without loc informations, node: " + n.type);
+  }
+
+  return n.loc.end.column;
+}
+
+function getFunctionBeginingByteOffset(n) {
+  if (!(n.body.length > 0)) {
+    throw new Error('n.body.length > 0' + " error: " + (undefined || "unknown"));
+  }
+
+  var _n$body = _slicedToArray(n.body, 1),
+      firstInstruction = _n$body[0];
+
+  return getStartByteOffset(firstInstruction);
+}
+
+function getEndBlockByteOffset(n) {
+  // $FlowIgnore
+  if (!(n.instr.length > 0 || n.body.length > 0)) {
+    throw new Error('n.instr.length > 0 || n.body.length > 0' + " error: " + (undefined || "unknown"));
+  }
+
+  var lastInstruction;
+
+  if (n.instr) {
+    // $FlowIgnore
+    lastInstruction = n.instr[n.instr.length - 1];
+  }
+
+  if (n.body) {
+    // $FlowIgnore
+    lastInstruction = n.body[n.body.length - 1];
+  }
+
+  if (!(_typeof(lastInstruction) === "object")) {
+    throw new Error('typeof lastInstruction === "object"' + " error: " + (undefined || "unknown"));
+  }
+
+  // $FlowIgnore
+  return getStartByteOffset(lastInstruction);
+}
+
+function getStartBlockByteOffset(n) {
+  // $FlowIgnore
+  if (!(n.instr.length > 0 || n.body.length > 0)) {
+    throw new Error('n.instr.length > 0 || n.body.length > 0' + " error: " + (undefined || "unknown"));
+  }
+
+  var fistInstruction;
+
+  if (n.instr) {
+    // $FlowIgnore
+    var _n$instr = _slicedToArray(n.instr, 1);
+
+    fistInstruction = _n$instr[0];
+  }
+
+  if (n.body) {
+    // $FlowIgnore
+    var _n$body2 = _slicedToArray(n.body, 1);
+
+    fistInstruction = _n$body2[0];
+  }
+
+  if (!(_typeof(fistInstruction) === "object")) {
+    throw new Error('typeof fistInstruction === "object"' + " error: " + (undefined || "unknown"));
+  }
+
+  // $FlowIgnore
+  return getStartByteOffset(fistInstruction);
+}

backend/frontend/node_modules/@webassemblyjs/ast/scripts/generateNodeUtils.js

@@ -0,0 +1,219 @@
+const definitions = require("../src/definitions");
+const flatMap = require("array.prototype.flatmap");
+const {
+  typeSignature,
+  iterateProps,
+  mapProps,
+  filterProps,
+  unique,
+} = require("./util");
+
+const stdout = process.stdout;
+
+const jsTypes = ["string", "number", "boolean"];
+
+const quote = (value) => `"${value}"`;
+
+function params(fields) {
+  const optionalDefault = (field) =>
+    field.default ? ` = ${field.default}` : "";
+  return mapProps(fields)
+    .map((field) => `${typeSignature(field)}${optionalDefault(field)}`)
+    .join(",");
+}
+
+function assertParamType({ assertNodeType, array, name, type }) {
+  if (array) {
+    // TODO - assert contents of array?
+    return `assert(typeof ${name} === "object" && typeof ${name}.length !== "undefined")\n`;
+  } else {
+    if (jsTypes.includes(type)) {
+      return `assert(
+          typeof ${name} === "${type}",
+          "Argument ${name} must be of type ${type}, given: " + typeof ${name}
+      )`;
+    }
+
+    if (assertNodeType === true) {
+      return `assert(
+        ${name}.type === "${type}",
+        "Argument ${name} must be of type ${type}, given: " + ${name}.type
+      )`;
+    }
+
+    return "";
+  }
+}
+
+function assertParam(meta) {
+  const paramAssertion = assertParamType(meta);
+
+  if (paramAssertion === "") {
+    return "";
+  }
+
+  if (meta.maybe || meta.optional) {
+    return `
+      if (${meta.name} !== null && ${meta.name} !== undefined) {
+        ${paramAssertion};
+      }
+    `;
+  } else {
+    return paramAssertion;
+  }
+}
+
+function assertParams(fields) {
+  return mapProps(fields).map(assertParam).join("\n");
+}
+
+function buildObject(typeDef) {
+  const optionalField = (meta) => {
+    if (meta.array) {
+      // omit optional array properties if the constructor function was supplied
+      // with an empty array
+      return `
+        if (typeof ${meta.name} !== "undefined" && ${meta.name}.length > 0) {
+          node.${meta.name} = ${meta.name};
+        }
+      `;
+    } else if (meta.type === "Object") {
+      // omit optional object properties if they have no keys
+      return `
+        if (typeof ${meta.name} !== "undefined" && Object.keys(${meta.name}).length !== 0) {
+          node.${meta.name} = ${meta.name};
+        }
+      `;
+    } else if (meta.type === "boolean") {
+      // omit optional boolean properties if they are not true
+      return `
+        if (${meta.name} === true) {
+          node.${meta.name} = true;
+        }
+      `;
+    } else {
+      return `
+        if (typeof ${meta.name} !== "undefined") {
+          node.${meta.name} = ${meta.name};
+        }
+      `;
+    }
+  };
+
+  const fields = mapProps(typeDef.fields)
+    .filter((f) => !f.optional && !f.constant)
+    .map((f) => f.name);
+
+  const constants = mapProps(typeDef.fields)
+    .filter((f) => f.constant)
+    .map((f) => `${f.name}: "${f.value}"`);
+
+  return `
+    const node: ${typeDef.flowTypeName || typeDef.name} = {
+      type: "${typeDef.name}",
+      ${constants.concat(fields).join(",")}
+    }
+
+    ${mapProps(typeDef.fields)
+      .filter((f) => f.optional)
+      .map(optionalField)
+      .join("")}
+  `;
+}
+
+function lowerCamelCase(name) {
+  return name.substring(0, 1).toLowerCase() + name.substring(1);
+}
+
+function generate() {
+  stdout.write(`
+    // @flow
+
+    // THIS FILE IS AUTOGENERATED
+    // see scripts/generateNodeUtils.js
+
+    import { assert } from "mamacro";
+
+    function isTypeOf(t: string) {
+      return (n: Node) => n.type === t;
+    }
+
+    function assertTypeOf(t: string) {
+      return (n: Node) => assert(n.type === t);
+    }
+  `);
+
+  // Node builders
+  iterateProps(definitions, (typeDefinition) => {
+    stdout.write(`
+      export function ${lowerCamelCase(typeDefinition.name)} (
+        ${params(filterProps(typeDefinition.fields, (f) => !f.constant))}
+      ): ${typeDefinition.name} {
+
+        ${assertParams(filterProps(typeDefinition.fields, (f) => !f.constant))}
+        ${buildObject(typeDefinition)} 
+
+        return node;
+      }
+    `);
+  });
+
+  // Node testers
+  iterateProps(definitions, (typeDefinition) => {
+    stdout.write(`
+      export const is${typeDefinition.name}: ((n: Node) => boolean) =
+        isTypeOf("${typeDefinition.name}");
+    `);
+  });
+
+  // Node union type testers
+  const unionTypes = unique(
+    flatMap(
+      mapProps(definitions).filter((d) => d.unionType),
+      (d) => d.unionType
+    )
+  );
+  unionTypes.forEach((unionType) => {
+    stdout.write(
+      `
+      export const is${unionType} = (node: Node): boolean => ` +
+        mapProps(definitions)
+          .filter((d) => d.unionType && d.unionType.includes(unionType))
+          .map((d) => `is${d.name}(node) `)
+          .join("||") +
+        ";\n\n"
+    );
+  });
+
+  // Node assertion
+  iterateProps(definitions, (typeDefinition) => {
+    stdout.write(`
+      export const assert${typeDefinition.name}: ((n: Node) => void) =
+        assertTypeOf("${typeDefinition.name}");
+    `);
+  });
+
+  // a map from node type to its set of union types
+  stdout.write(
+    `
+    export const unionTypesMap = {` +
+      mapProps(definitions)
+        .filter((d) => d.unionType)
+        .map((t) => `"${t.name}": [${t.unionType.map(quote).join(",")}]\n`) +
+      `};
+      `
+  );
+
+  // an array of all node and union types
+  stdout.write(
+    `
+    export const nodeAndUnionTypes = [` +
+      mapProps(definitions)
+        .map((t) => `"${t.name}"`)
+        .concat(unionTypes.map(quote))
+        .join(",") +
+      `];`
+  );
+}
+
+generate();

backend/frontend/node_modules/@webassemblyjs/ast/scripts/generateTypeDefinitions.js

@@ -0,0 +1,48 @@
+const definitions = require("../src/definitions");
+const flatMap = require("array.prototype.flatmap");
+const { typeSignature, mapProps, iterateProps, unique } = require("./util");
+
+const stdout = process.stdout;
+
+function params(fields) {
+  return mapProps(fields).map(typeSignature).join(",");
+}
+
+function generate() {
+  stdout.write(`
+    // @flow
+    /* eslint no-unused-vars: off */
+
+    // THIS FILE IS AUTOGENERATED
+    // see scripts/generateTypeDefinitions.js
+  `);
+
+  // generate union types
+  const unionTypes = unique(
+    flatMap(
+      mapProps(definitions).filter((d) => d.unionType),
+      (d) => d.unionType
+    )
+  );
+  unionTypes.forEach((unionType) => {
+    stdout.write(
+      `type ${unionType} = ` +
+        mapProps(definitions)
+          .filter((d) => d.unionType && d.unionType.includes(unionType))
+          .map((d) => d.name)
+          .join("|") +
+        ";\n\n"
+    );
+  });
+
+  // generate the type definitions
+  iterateProps(definitions, (typeDef) => {
+    stdout.write(`type ${typeDef.name} = {
+        ...BaseNode,
+        type: "${typeDef.name}",
+        ${params(typeDef.fields)}
+      };\n\n`);
+  });
+}
+
+generate();

backend/frontend/node_modules/@webassemblyjs/ast/scripts/util.js

@@ -0,0 +1,38 @@
+function iterateProps(obj, iterator) {
+  Object.keys(obj).forEach((key) => iterator({ ...obj[key], name: key }));
+}
+
+function mapProps(obj) {
+  return Object.keys(obj).map((key) => ({ ...obj[key], name: key }));
+}
+
+function filterProps(obj, filter) {
+  const ret = {};
+  Object.keys(obj).forEach((key) => {
+    if (filter(obj[key])) {
+      ret[key] = obj[key];
+    }
+  });
+  return ret;
+}
+
+function typeSignature(meta) {
+  const type = meta.array ? `Array<${meta.type}>` : meta.type;
+  if (meta.optional) {
+    return `${meta.name}?: ${type}`;
+  } else if (meta.maybe) {
+    return `${meta.name}: ?${type}`;
+  } else {
+    return `${meta.name}: ${type}`;
+  }
+}
+
+const unique = (items) => Array.from(new Set(items));
+
+module.exports = {
+  iterateProps,
+  mapProps,
+  filterProps,
+  typeSignature,
+  unique,
+};

backend/frontend/node_modules/@webassemblyjs/floating-point-hex-parser/lib/index.js

@@ -0,0 +1,49 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports["default"] = parse;
+
+function parse(input) {
+  input = input.toUpperCase();
+  var splitIndex = input.indexOf("P");
+  var mantissa, exponent;
+
+  if (splitIndex !== -1) {
+    mantissa = input.substring(0, splitIndex);
+    exponent = parseInt(input.substring(splitIndex + 1));
+  } else {
+    mantissa = input;
+    exponent = 0;
+  }
+
+  var dotIndex = mantissa.indexOf(".");
+
+  if (dotIndex !== -1) {
+    var integerPart = parseInt(mantissa.substring(0, dotIndex), 16);
+    var sign = Math.sign(integerPart);
+    integerPart = sign * integerPart;
+    var fractionLength = mantissa.length - dotIndex - 1;
+    var fractionalPart = parseInt(mantissa.substring(dotIndex + 1), 16);
+    var fraction = fractionLength > 0 ? fractionalPart / Math.pow(16, fractionLength) : 0;
+
+    if (sign === 0) {
+      if (fraction === 0) {
+        mantissa = sign;
+      } else {
+        if (Object.is(sign, -0)) {
+          mantissa = -fraction;
+        } else {
+          mantissa = fraction;
+        }
+      }
+    } else {
+      mantissa = sign * (integerPart + fraction);
+    }
+  } else {
+    mantissa = parseInt(mantissa, 16);
+  }
+
+  return mantissa * (splitIndex !== -1 ? Math.pow(2, exponent) : 1);
+}

backend/frontend/node_modules/@webassemblyjs/helper-api-error/lib/index.js

@@ -0,0 +1,78 @@
+"use strict";
+
+function _typeof(obj) { "@babel/helpers - typeof"; if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.LinkError = exports.CompileError = exports.RuntimeError = void 0;
+
+function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
+
+function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }
+
+function _createSuper(Derived) { var hasNativeReflectConstruct = _isNativeReflectConstruct(); return function _createSuperInternal() { var Super = _getPrototypeOf(Derived), result; if (hasNativeReflectConstruct) { var NewTarget = _getPrototypeOf(this).constructor; result = Reflect.construct(Super, arguments, NewTarget); } else { result = Super.apply(this, arguments); } return _possibleConstructorReturn(this, result); }; }
+
+function _possibleConstructorReturn(self, call) { if (call && (_typeof(call) === "object" || typeof call === "function")) { return call; } else if (call !== void 0) { throw new TypeError("Derived constructors may only return object or undefined"); } return _assertThisInitialized(self); }
+
+function _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return self; }
+
+function _wrapNativeSuper(Class) { var _cache = typeof Map === "function" ? new Map() : undefined; _wrapNativeSuper = function _wrapNativeSuper(Class) { if (Class === null || !_isNativeFunction(Class)) return Class; if (typeof Class !== "function") { throw new TypeError("Super expression must either be null or a function"); } if (typeof _cache !== "undefined") { if (_cache.has(Class)) return _cache.get(Class); _cache.set(Class, Wrapper); } function Wrapper() { return _construct(Class, arguments, _getPrototypeOf(this).constructor); } Wrapper.prototype = Object.create(Class.prototype, { constructor: { value: Wrapper, enumerable: false, writable: true, configurable: true } }); return _setPrototypeOf(Wrapper, Class); }; return _wrapNativeSuper(Class); }
+
+function _construct(Parent, args, Class) { if (_isNativeReflectConstruct()) { _construct = Reflect.construct; } else { _construct = function _construct(Parent, args, Class) { var a = [null]; a.push.apply(a, args); var Constructor = Function.bind.apply(Parent, a); var instance = new Constructor(); if (Class) _setPrototypeOf(instance, Class.prototype); return instance; }; } return _construct.apply(null, arguments); }
+
+function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct) return false; if (Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { Boolean.prototype.valueOf.call(Reflect.construct(Boolean, [], function () {})); return true; } catch (e) { return false; } }
+
+function _isNativeFunction(fn) { return Function.toString.call(fn).indexOf("[native code]") !== -1; }
+
+function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+
+function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }
+
+var RuntimeError = /*#__PURE__*/function (_Error) {
+  _inherits(RuntimeError, _Error);
+
+  var _super = _createSuper(RuntimeError);
+
+  function RuntimeError() {
+    _classCallCheck(this, RuntimeError);
+
+    return _super.apply(this, arguments);
+  }
+
+  return RuntimeError;
+}( /*#__PURE__*/_wrapNativeSuper(Error));
+
+exports.RuntimeError = RuntimeError;
+
+var CompileError = /*#__PURE__*/function (_Error2) {
+  _inherits(CompileError, _Error2);
+
+  var _super2 = _createSuper(CompileError);
+
+  function CompileError() {
+    _classCallCheck(this, CompileError);
+
+    return _super2.apply(this, arguments);
+  }
+
+  return CompileError;
+}( /*#__PURE__*/_wrapNativeSuper(Error));
+
+exports.CompileError = CompileError;
+
+var LinkError = /*#__PURE__*/function (_Error3) {
+  _inherits(LinkError, _Error3);
+
+  var _super3 = _createSuper(LinkError);
+
+  function LinkError() {
+    _classCallCheck(this, LinkError);
+
+    return _super3.apply(this, arguments);
+  }
+
+  return LinkError;
+}( /*#__PURE__*/_wrapNativeSuper(Error));
+
+exports.LinkError = LinkError;

backend/frontend/node_modules/@webassemblyjs/helper-buffer/lib/compare.js

@@ -0,0 +1,73 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.compareArrayBuffers = compareArrayBuffers;
+
+// this are dev dependencies
+var diff = require("jest-diff");
+
+var _require = require("jest-diff/build/constants"),
+    NO_DIFF_MESSAGE = _require.NO_DIFF_MESSAGE;
+
+var _require2 = require("@webassemblyjs/wasm-parser"),
+    decode = _require2.decode;
+
+var oldConsoleLog = console.log;
+
+function compareArrayBuffers(l, r) {
+  /**
+   * Decode left
+   */
+  var bufferL = "";
+
+  console.log = function () {
+    for (var _len = arguments.length, texts = new Array(_len), _key = 0; _key < _len; _key++) {
+      texts[_key] = arguments[_key];
+    }
+
+    return bufferL += texts.join("") + "\n";
+  };
+
+  try {
+    decode(l, {
+      dump: true
+    });
+  } catch (e) {
+    console.error(bufferL);
+    console.error(e);
+    throw e;
+  }
+  /**
+   * Decode right
+   */
+
+
+  var bufferR = "";
+
+  console.log = function () {
+    for (var _len2 = arguments.length, texts = new Array(_len2), _key2 = 0; _key2 < _len2; _key2++) {
+      texts[_key2] = arguments[_key2];
+    }
+
+    return bufferR += texts.join("") + "\n";
+  };
+
+  try {
+    decode(r, {
+      dump: true
+    });
+  } catch (e) {
+    console.error(bufferR);
+    console.error(e);
+    throw e;
+  }
+
+  console.log = oldConsoleLog;
+  var out = diff(bufferL, bufferR);
+
+  if (out !== null && out !== NO_DIFF_MESSAGE) {
+    throw new Error("\n" + out);
+  }
+}

backend/frontend/node_modules/@webassemblyjs/helper-buffer/lib/index.js

@@ -0,0 +1,89 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.overrideBytesInBuffer = overrideBytesInBuffer;
+exports.makeBuffer = makeBuffer;
+exports.fromHexdump = fromHexdump;
+
+function _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _unsupportedIterableToArray(arr) || _nonIterableSpread(); }
+
+function _nonIterableSpread() { throw new TypeError("Invalid attempt to spread non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); }
+
+function _unsupportedIterableToArray(o, minLen) { if (!o) return; if (typeof o === "string") return _arrayLikeToArray(o, minLen); var n = Object.prototype.toString.call(o).slice(8, -1); if (n === "Object" && o.constructor) n = o.constructor.name; if (n === "Map" || n === "Set") return Array.from(o); if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen); }
+
+function _iterableToArray(iter) { if (typeof Symbol !== "undefined" && iter[Symbol.iterator] != null || iter["@@iterator"] != null) return Array.from(iter); }
+
+function _arrayWithoutHoles(arr) { if (Array.isArray(arr)) return _arrayLikeToArray(arr); }
+
+function _arrayLikeToArray(arr, len) { if (len == null || len > arr.length) len = arr.length; for (var i = 0, arr2 = new Array(len); i < len; i++) { arr2[i] = arr[i]; } return arr2; }
+
+function concatUint8Arrays() {
+  for (var _len = arguments.length, arrays = new Array(_len), _key = 0; _key < _len; _key++) {
+    arrays[_key] = arguments[_key];
+  }
+
+  var totalLength = arrays.reduce(function (a, b) {
+    return a + b.length;
+  }, 0);
+  var result = new Uint8Array(totalLength);
+  var offset = 0;
+
+  for (var _i = 0, _arrays = arrays; _i < _arrays.length; _i++) {
+    var arr = _arrays[_i];
+
+    if (arr instanceof Uint8Array === false) {
+      throw new Error("arr must be of type Uint8Array");
+    }
+
+    result.set(arr, offset);
+    offset += arr.length;
+  }
+
+  return result;
+}
+
+function overrideBytesInBuffer(buffer, startLoc, endLoc, newBytes) {
+  var beforeBytes = buffer.slice(0, startLoc);
+  var afterBytes = buffer.slice(endLoc, buffer.length); // replacement is empty, we can omit it
+
+  if (newBytes.length === 0) {
+    return concatUint8Arrays(beforeBytes, afterBytes);
+  }
+
+  var replacement = Uint8Array.from(newBytes);
+  return concatUint8Arrays(beforeBytes, replacement, afterBytes);
+}
+
+function makeBuffer() {
+  for (var _len2 = arguments.length, splitedBytes = new Array(_len2), _key2 = 0; _key2 < _len2; _key2++) {
+    splitedBytes[_key2] = arguments[_key2];
+  }
+
+  // $FlowIgnore
+  var bytes = [].concat.apply([], splitedBytes);
+  return new Uint8Array(bytes).buffer;
+}
+
+function fromHexdump(str) {
+  var lines = str.split("\n"); // remove any leading left whitespace
+
+  lines = lines.map(function (line) {
+    return line.trim();
+  });
+  var bytes = lines.reduce(function (acc, line) {
+    var cols = line.split(" "); // remove the offset, left column
+
+    cols.shift();
+    cols = cols.filter(function (x) {
+      return x !== "";
+    });
+    var bytes = cols.map(function (x) {
+      return parseInt(x, 16);
+    });
+    acc.push.apply(acc, _toConsumableArray(bytes));
+    return acc;
+  }, []);
+  return new Uint8Array(bytes);
+}

backend/frontend/node_modules/@webassemblyjs/helper-numbers/lib/index.js

@@ -0,0 +1,117 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.parse32F = parse32F;
+exports.parse64F = parse64F;
+exports.parse32I = parse32I;
+exports.parseU32 = parseU32;
+exports.parse64I = parse64I;
+exports.isInfLiteral = isInfLiteral;
+exports.isNanLiteral = isNanLiteral;
+
+var _long2 = _interopRequireDefault(require("@xtuc/long"));
+
+var _floatingPointHexParser = _interopRequireDefault(require("@webassemblyjs/floating-point-hex-parser"));
+
+var _helperApiError = require("@webassemblyjs/helper-api-error");
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { "default": obj }; }
+
+function parse32F(sourceString) {
+  if (isHexLiteral(sourceString)) {
+    return (0, _floatingPointHexParser["default"])(sourceString);
+  }
+
+  if (isInfLiteral(sourceString)) {
+    return sourceString[0] === "-" ? -1 : 1;
+  }
+
+  if (isNanLiteral(sourceString)) {
+    return (sourceString[0] === "-" ? -1 : 1) * (sourceString.includes(":") ? parseInt(sourceString.substring(sourceString.indexOf(":") + 1), 16) : 0x400000);
+  }
+
+  return parseFloat(sourceString);
+}
+
+function parse64F(sourceString) {
+  if (isHexLiteral(sourceString)) {
+    return (0, _floatingPointHexParser["default"])(sourceString);
+  }
+
+  if (isInfLiteral(sourceString)) {
+    return sourceString[0] === "-" ? -1 : 1;
+  }
+
+  if (isNanLiteral(sourceString)) {
+    return (sourceString[0] === "-" ? -1 : 1) * (sourceString.includes(":") ? parseInt(sourceString.substring(sourceString.indexOf(":") + 1), 16) : 0x8000000000000);
+  }
+
+  if (isHexLiteral(sourceString)) {
+    return (0, _floatingPointHexParser["default"])(sourceString);
+  }
+
+  return parseFloat(sourceString);
+}
+
+function parse32I(sourceString) {
+  var value = 0;
+
+  if (isHexLiteral(sourceString)) {
+    value = ~~parseInt(sourceString, 16);
+  } else if (isDecimalExponentLiteral(sourceString)) {
+    throw new Error("This number literal format is yet to be implemented.");
+  } else {
+    value = parseInt(sourceString, 10);
+  }
+
+  return value;
+}
+
+function parseU32(sourceString) {
+  var value = parse32I(sourceString);
+
+  if (value < 0) {
+    throw new _helperApiError.CompileError("Illegal value for u32: " + sourceString);
+  }
+
+  return value;
+}
+
+function parse64I(sourceString) {
+  // $FlowIgnore
+  var _long;
+
+  if (isHexLiteral(sourceString)) {
+    _long = _long2["default"].fromString(sourceString, false, 16);
+  } else if (isDecimalExponentLiteral(sourceString)) {
+    throw new Error("This number literal format is yet to be implemented.");
+  } else {
+    _long = _long2["default"].fromString(sourceString);
+  }
+
+  return {
+    high: _long.high,
+    low: _long.low
+  };
+}
+
+var NAN_WORD = /^\+?-?nan/;
+var INF_WORD = /^\+?-?inf/;
+
+function isInfLiteral(sourceString) {
+  return INF_WORD.test(sourceString.toLowerCase());
+}
+
+function isNanLiteral(sourceString) {
+  return NAN_WORD.test(sourceString.toLowerCase());
+}
+
+function isDecimalExponentLiteral(sourceString) {
+  return !isHexLiteral(sourceString) && sourceString.toUpperCase().includes("E");
+}
+
+function isHexLiteral(sourceString) {
+  return sourceString.substring(0, 2).toUpperCase() === "0X" || sourceString.substring(0, 3).toUpperCase() === "-0X";
+}

backend/frontend/node_modules/@webassemblyjs/helper-wasm-bytecode/lib/index.js

@@ -0,0 +1,430 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+Object.defineProperty(exports, "getSectionForNode", {
+  enumerable: true,
+  get: function get() {
+    return _section.getSectionForNode;
+  }
+});
+exports["default"] = void 0;
+
+var _section = require("./section");
+
+var illegalop = "illegal";
+var magicModuleHeader = [0x00, 0x61, 0x73, 0x6d];
+var moduleVersion = [0x01, 0x00, 0x00, 0x00];
+
+function invertMap(obj) {
+  var keyModifierFn = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : function (k) {
+    return k;
+  };
+  var result = {};
+  var keys = Object.keys(obj);
+
+  for (var i = 0, length = keys.length; i < length; i++) {
+    result[keyModifierFn(obj[keys[i]])] = keys[i];
+  }
+
+  return result;
+}
+
+function createSymbolObject(name
+/*: string */
+, object
+/*: string */
+)
+/*: Symbol*/
+{
+  var numberOfArgs
+  /*: number*/
+  = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : 0;
+  return {
+    name: name,
+    object: object,
+    numberOfArgs: numberOfArgs
+  };
+}
+
+function createSymbol(name
+/*: string */
+)
+/*: Symbol*/
+{
+  var numberOfArgs
+  /*: number*/
+  = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 0;
+  return {
+    name: name,
+    numberOfArgs: numberOfArgs
+  };
+}
+
+var types = {
+  func: 0x60,
+  result: 0x40
+};
+var exportTypes = {
+  0x00: "Func",
+  0x01: "Table",
+  0x02: "Memory",
+  0x03: "Global"
+};
+var exportTypesByName = invertMap(exportTypes);
+var valtypes = {
+  // numtype
+  0x7f: "i32",
+  0x7e: "i64",
+  0x7d: "f32",
+  0x7c: "f64",
+  // vectype
+  0x7b: "v128",
+  // reftype
+  0x70: "anyfunc",
+  0x6f: "externref"
+};
+var valtypesByString = invertMap(valtypes);
+var tableTypes = {
+  0x70: "anyfunc",
+  0x6f: "externref"
+};
+var blockTypes = Object.assign({}, valtypes, {
+  // https://webassembly.github.io/spec/core/binary/types.html#binary-blocktype
+  0x40: null,
+  // https://webassembly.github.io/spec/core/binary/types.html#binary-valtype
+  0x7f: "i32",
+  0x7e: "i64",
+  0x7d: "f32",
+  0x7c: "f64"
+});
+var globalTypes = {
+  0x00: "const",
+  0x01: "var"
+};
+var globalTypesByString = invertMap(globalTypes);
+var importTypes = {
+  0x00: "func",
+  0x01: "table",
+  0x02: "memory",
+  0x03: "global"
+};
+var sections = {
+  custom: 0,
+  type: 1,
+  "import": 2,
+  func: 3,
+  table: 4,
+  memory: 5,
+  global: 6,
+  "export": 7,
+  start: 8,
+  element: 9,
+  code: 10,
+  data: 11
+};
+var symbolsByByte = {
+  0x00: createSymbol("unreachable"),
+  0x01: createSymbol("nop"),
+  0x02: createSymbol("block"),
+  0x03: createSymbol("loop"),
+  0x04: createSymbol("if"),
+  0x05: createSymbol("else"),
+  0x06: illegalop,
+  0x07: illegalop,
+  0x08: illegalop,
+  0x09: illegalop,
+  0x0a: illegalop,
+  0x0b: createSymbol("end"),
+  0x0c: createSymbol("br", 1),
+  0x0d: createSymbol("br_if", 1),
+  0x0e: createSymbol("br_table"),
+  0x0f: createSymbol("return"),
+  0x10: createSymbol("call", 1),
+  0x11: createSymbol("call_indirect", 2),
+  0x12: illegalop,
+  0x13: illegalop,
+  0x14: illegalop,
+  0x15: illegalop,
+  0x16: illegalop,
+  0x17: illegalop,
+  0x18: illegalop,
+  0x19: illegalop,
+  0x1a: createSymbol("drop"),
+  0x1b: createSymbol("select"),
+  0x1c: illegalop,
+  0x1d: illegalop,
+  0x1e: illegalop,
+  0x1f: illegalop,
+  0x20: createSymbol("get_local", 1),
+  0x21: createSymbol("set_local", 1),
+  0x22: createSymbol("tee_local", 1),
+  0x23: createSymbol("get_global", 1),
+  0x24: createSymbol("set_global", 1),
+  0x25: createSymbol("table.get", 1),
+  0x26: createSymbol("table.set", 1),
+  0x27: illegalop,
+  0x28: createSymbolObject("load", "u32", 1),
+  0x29: createSymbolObject("load", "u64", 1),
+  0x2a: createSymbolObject("load", "f32", 1),
+  0x2b: createSymbolObject("load", "f64", 1),
+  0x2c: createSymbolObject("load8_s", "u32", 1),
+  0x2d: createSymbolObject("load8_u", "u32", 1),
+  0x2e: createSymbolObject("load16_s", "u32", 1),
+  0x2f: createSymbolObject("load16_u", "u32", 1),
+  0x30: createSymbolObject("load8_s", "u64", 1),
+  0x31: createSymbolObject("load8_u", "u64", 1),
+  0x32: createSymbolObject("load16_s", "u64", 1),
+  0x33: createSymbolObject("load16_u", "u64", 1),
+  0x34: createSymbolObject("load32_s", "u64", 1),
+  0x35: createSymbolObject("load32_u", "u64", 1),
+  0x36: createSymbolObject("store", "u32", 1),
+  0x37: createSymbolObject("store", "u64", 1),
+  0x38: createSymbolObject("store", "f32", 1),
+  0x39: createSymbolObject("store", "f64", 1),
+  0x3a: createSymbolObject("store8", "u32", 1),
+  0x3b: createSymbolObject("store16", "u32", 1),
+  0x3c: createSymbolObject("store8", "u64", 1),
+  0x3d: createSymbolObject("store16", "u64", 1),
+  0x3e: createSymbolObject("store32", "u64", 1),
+  0x3f: createSymbolObject("current_memory"),
+  0x40: createSymbolObject("grow_memory"),
+  0x41: createSymbolObject("const", "i32", 1),
+  0x42: createSymbolObject("const", "i64", 1),
+  0x43: createSymbolObject("const", "f32", 1),
+  0x44: createSymbolObject("const", "f64", 1),
+  0x45: createSymbolObject("eqz", "i32"),
+  0x46: createSymbolObject("eq", "i32"),
+  0x47: createSymbolObject("ne", "i32"),
+  0x48: createSymbolObject("lt_s", "i32"),
+  0x49: createSymbolObject("lt_u", "i32"),
+  0x4a: createSymbolObject("gt_s", "i32"),
+  0x4b: createSymbolObject("gt_u", "i32"),
+  0x4c: createSymbolObject("le_s", "i32"),
+  0x4d: createSymbolObject("le_u", "i32"),
+  0x4e: createSymbolObject("ge_s", "i32"),
+  0x4f: createSymbolObject("ge_u", "i32"),
+  0x50: createSymbolObject("eqz", "i64"),
+  0x51: createSymbolObject("eq", "i64"),
+  0x52: createSymbolObject("ne", "i64"),
+  0x53: createSymbolObject("lt_s", "i64"),
+  0x54: createSymbolObject("lt_u", "i64"),
+  0x55: createSymbolObject("gt_s", "i64"),
+  0x56: createSymbolObject("gt_u", "i64"),
+  0x57: createSymbolObject("le_s", "i64"),
+  0x58: createSymbolObject("le_u", "i64"),
+  0x59: createSymbolObject("ge_s", "i64"),
+  0x5a: createSymbolObject("ge_u", "i64"),
+  0x5b: createSymbolObject("eq", "f32"),
+  0x5c: createSymbolObject("ne", "f32"),
+  0x5d: createSymbolObject("lt", "f32"),
+  0x5e: createSymbolObject("gt", "f32"),
+  0x5f: createSymbolObject("le", "f32"),
+  0x60: createSymbolObject("ge", "f32"),
+  0x61: createSymbolObject("eq", "f64"),
+  0x62: createSymbolObject("ne", "f64"),
+  0x63: createSymbolObject("lt", "f64"),
+  0x64: createSymbolObject("gt", "f64"),
+  0x65: createSymbolObject("le", "f64"),
+  0x66: createSymbolObject("ge", "f64"),
+  0x67: createSymbolObject("clz", "i32"),
+  0x68: createSymbolObject("ctz", "i32"),
+  0x69: createSymbolObject("popcnt", "i32"),
+  0x6a: createSymbolObject("add", "i32"),
+  0x6b: createSymbolObject("sub", "i32"),
+  0x6c: createSymbolObject("mul", "i32"),
+  0x6d: createSymbolObject("div_s", "i32"),
+  0x6e: createSymbolObject("div_u", "i32"),
+  0x6f: createSymbolObject("rem_s", "i32"),
+  0x70: createSymbolObject("rem_u", "i32"),
+  0x71: createSymbolObject("and", "i32"),
+  0x72: createSymbolObject("or", "i32"),
+  0x73: createSymbolObject("xor", "i32"),
+  0x74: createSymbolObject("shl", "i32"),
+  0x75: createSymbolObject("shr_s", "i32"),
+  0x76: createSymbolObject("shr_u", "i32"),
+  0x77: createSymbolObject("rotl", "i32"),
+  0x78: createSymbolObject("rotr", "i32"),
+  0x79: createSymbolObject("clz", "i64"),
+  0x7a: createSymbolObject("ctz", "i64"),
+  0x7b: createSymbolObject("popcnt", "i64"),
+  0x7c: createSymbolObject("add", "i64"),
+  0x7d: createSymbolObject("sub", "i64"),
+  0x7e: createSymbolObject("mul", "i64"),
+  0x7f: createSymbolObject("div_s", "i64"),
+  0x80: createSymbolObject("div_u", "i64"),
+  0x81: createSymbolObject("rem_s", "i64"),
+  0x82: createSymbolObject("rem_u", "i64"),
+  0x83: createSymbolObject("and", "i64"),
+  0x84: createSymbolObject("or", "i64"),
+  0x85: createSymbolObject("xor", "i64"),
+  0x86: createSymbolObject("shl", "i64"),
+  0x87: createSymbolObject("shr_s", "i64"),
+  0x88: createSymbolObject("shr_u", "i64"),
+  0x89: createSymbolObject("rotl", "i64"),
+  0x8a: createSymbolObject("rotr", "i64"),
+  0x8b: createSymbolObject("abs", "f32"),
+  0x8c: createSymbolObject("neg", "f32"),
+  0x8d: createSymbolObject("ceil", "f32"),
+  0x8e: createSymbolObject("floor", "f32"),
+  0x8f: createSymbolObject("trunc", "f32"),
+  0x90: createSymbolObject("nearest", "f32"),
+  0x91: createSymbolObject("sqrt", "f32"),
+  0x92: createSymbolObject("add", "f32"),
+  0x93: createSymbolObject("sub", "f32"),
+  0x94: createSymbolObject("mul", "f32"),
+  0x95: createSymbolObject("div", "f32"),
+  0x96: createSymbolObject("min", "f32"),
+  0x97: createSymbolObject("max", "f32"),
+  0x98: createSymbolObject("copysign", "f32"),
+  0x99: createSymbolObject("abs", "f64"),
+  0x9a: createSymbolObject("neg", "f64"),
+  0x9b: createSymbolObject("ceil", "f64"),
+  0x9c: createSymbolObject("floor", "f64"),
+  0x9d: createSymbolObject("trunc", "f64"),
+  0x9e: createSymbolObject("nearest", "f64"),
+  0x9f: createSymbolObject("sqrt", "f64"),
+  0xa0: createSymbolObject("add", "f64"),
+  0xa1: createSymbolObject("sub", "f64"),
+  0xa2: createSymbolObject("mul", "f64"),
+  0xa3: createSymbolObject("div", "f64"),
+  0xa4: createSymbolObject("min", "f64"),
+  0xa5: createSymbolObject("max", "f64"),
+  0xa6: createSymbolObject("copysign", "f64"),
+  0xa7: createSymbolObject("wrap/i64", "i32"),
+  0xa8: createSymbolObject("trunc_s/f32", "i32"),
+  0xa9: createSymbolObject("trunc_u/f32", "i32"),
+  0xaa: createSymbolObject("trunc_s/f64", "i32"),
+  0xab: createSymbolObject("trunc_u/f64", "i32"),
+  0xac: createSymbolObject("extend_s/i32", "i64"),
+  0xad: createSymbolObject("extend_u/i32", "i64"),
+  0xae: createSymbolObject("trunc_s/f32", "i64"),
+  0xaf: createSymbolObject("trunc_u/f32", "i64"),
+  0xb0: createSymbolObject("trunc_s/f64", "i64"),
+  0xb1: createSymbolObject("trunc_u/f64", "i64"),
+  0xb2: createSymbolObject("convert_s/i32", "f32"),
+  0xb3: createSymbolObject("convert_u/i32", "f32"),
+  0xb4: createSymbolObject("convert_s/i64", "f32"),
+  0xb5: createSymbolObject("convert_u/i64", "f32"),
+  0xb6: createSymbolObject("demote/f64", "f32"),
+  0xb7: createSymbolObject("convert_s/i32", "f64"),
+  0xb8: createSymbolObject("convert_u/i32", "f64"),
+  0xb9: createSymbolObject("convert_s/i64", "f64"),
+  0xba: createSymbolObject("convert_u/i64", "f64"),
+  0xbb: createSymbolObject("promote/f32", "f64"),
+  0xbc: createSymbolObject("reinterpret/f32", "i32"),
+  0xbd: createSymbolObject("reinterpret/f64", "i64"),
+  0xbe: createSymbolObject("reinterpret/i32", "f32"),
+  0xbf: createSymbolObject("reinterpret/i64", "f64"),
+  0xc0: createSymbolObject("extend8_s", "i32"),
+  0xc1: createSymbolObject("extend16_s", "i32"),
+  0xc2: createSymbolObject("extend8_s", "i64"),
+  0xc3: createSymbolObject("extend16_s", "i64"),
+  0xc4: createSymbolObject("extend32_s", "i64"),
+  0xd0: createSymbol("ref.null"),
+  0xd1: createSymbol("ref.is_null"),
+  0xd2: createSymbol("ref.func", 1),
+  0xfc0a: createSymbol("memory.copy"),
+  0xfc0b: createSymbol("memory.fill"),
+  // Table instructions
+  // https://webassembly.github.io/spec/core/binary/instructions.html#table-instructions
+  0xfc0c: createSymbol("table.init", 2),
+  0xfc0d: createSymbol("elem.drop", 1),
+  0xfc0e: createSymbol("table.copy", 2),
+  0xfc0f: createSymbol("table.grow", 1),
+  0xfc10: createSymbol("table.size", 1),
+  0xfc11: createSymbol("table.fill", 1),
+  // Atomic Memory Instructions
+  0xfe00: createSymbol("memory.atomic.notify", 1),
+  0xfe01: createSymbol("memory.atomic.wait32", 1),
+  0xfe02: createSymbol("memory.atomic.wait64", 1),
+  0xfe10: createSymbolObject("atomic.load", "i32", 1),
+  0xfe11: createSymbolObject("atomic.load", "i64", 1),
+  0xfe12: createSymbolObject("atomic.load8_u", "i32", 1),
+  0xfe13: createSymbolObject("atomic.load16_u", "i32", 1),
+  0xfe14: createSymbolObject("atomic.load8_u", "i64", 1),
+  0xfe15: createSymbolObject("atomic.load16_u", "i64", 1),
+  0xfe16: createSymbolObject("atomic.load32_u", "i64", 1),
+  0xfe17: createSymbolObject("atomic.store", "i32", 1),
+  0xfe18: createSymbolObject("atomic.store", "i64", 1),
+  0xfe19: createSymbolObject("atomic.store8_u", "i32", 1),
+  0xfe1a: createSymbolObject("atomic.store16_u", "i32", 1),
+  0xfe1b: createSymbolObject("atomic.store8_u", "i64", 1),
+  0xfe1c: createSymbolObject("atomic.store16_u", "i64", 1),
+  0xfe1d: createSymbolObject("atomic.store32_u", "i64", 1),
+  0xfe1e: createSymbolObject("atomic.rmw.add", "i32", 1),
+  0xfe1f: createSymbolObject("atomic.rmw.add", "i64", 1),
+  0xfe20: createSymbolObject("atomic.rmw8_u.add_u", "i32", 1),
+  0xfe21: createSymbolObject("atomic.rmw16_u.add_u", "i32", 1),
+  0xfe22: createSymbolObject("atomic.rmw8_u.add_u", "i64", 1),
+  0xfe23: createSymbolObject("atomic.rmw16_u.add_u", "i64", 1),
+  0xfe24: createSymbolObject("atomic.rmw32_u.add_u", "i64", 1),
+  0xfe25: createSymbolObject("atomic.rmw.sub", "i32", 1),
+  0xfe26: createSymbolObject("atomic.rmw.sub", "i64", 1),
+  0xfe27: createSymbolObject("atomic.rmw8_u.sub_u", "i32", 1),
+  0xfe28: createSymbolObject("atomic.rmw16_u.sub_u", "i32", 1),
+  0xfe29: createSymbolObject("atomic.rmw8_u.sub_u", "i64", 1),
+  0xfe2a: createSymbolObject("atomic.rmw16_u.sub_u", "i64", 1),
+  0xfe2b: createSymbolObject("atomic.rmw32_u.sub_u", "i64", 1),
+  0xfe2c: createSymbolObject("atomic.rmw.and", "i32", 1),
+  0xfe2d: createSymbolObject("atomic.rmw.and", "i64", 1),
+  0xfe2e: createSymbolObject("atomic.rmw8_u.and_u", "i32", 1),
+  0xfe2f: createSymbolObject("atomic.rmw16_u.and_u", "i32", 1),
+  0xfe30: createSymbolObject("atomic.rmw8_u.and_u", "i64", 1),
+  0xfe31: createSymbolObject("atomic.rmw16_u.and_u", "i64", 1),
+  0xfe32: createSymbolObject("atomic.rmw32_u.and_u", "i64", 1),
+  0xfe33: createSymbolObject("atomic.rmw.or", "i32", 1),
+  0xfe34: createSymbolObject("atomic.rmw.or", "i64", 1),
+  0xfe35: createSymbolObject("atomic.rmw8_u.or_u", "i32", 1),
+  0xfe36: createSymbolObject("atomic.rmw16_u.or_u", "i32", 1),
+  0xfe37: createSymbolObject("atomic.rmw8_u.or_u", "i64", 1),
+  0xfe38: createSymbolObject("atomic.rmw16_u.or_u", "i64", 1),
+  0xfe39: createSymbolObject("atomic.rmw32_u.or_u", "i64", 1),
+  0xfe3a: createSymbolObject("atomic.rmw.xor", "i32", 1),
+  0xfe3b: createSymbolObject("atomic.rmw.xor", "i64", 1),
+  0xfe3c: createSymbolObject("atomic.rmw8_u.xor_u", "i32", 1),
+  0xfe3d: createSymbolObject("atomic.rmw16_u.xor_u", "i32", 1),
+  0xfe3e: createSymbolObject("atomic.rmw8_u.xor_u", "i64", 1),
+  0xfe3f: createSymbolObject("atomic.rmw16_u.xor_u", "i64", 1),
+  0xfe40: createSymbolObject("atomic.rmw32_u.xor_u", "i64", 1),
+  0xfe41: createSymbolObject("atomic.rmw.xchg", "i32", 1),
+  0xfe42: createSymbolObject("atomic.rmw.xchg", "i64", 1),
+  0xfe43: createSymbolObject("atomic.rmw8_u.xchg_u", "i32", 1),
+  0xfe44: createSymbolObject("atomic.rmw16_u.xchg_u", "i32", 1),
+  0xfe45: createSymbolObject("atomic.rmw8_u.xchg_u", "i64", 1),
+  0xfe46: createSymbolObject("atomic.rmw16_u.xchg_u", "i64", 1),
+  0xfe47: createSymbolObject("atomic.rmw32_u.xchg_u", "i64", 1),
+  0xfe48: createSymbolObject("atomic.rmw.cmpxchg", "i32", 1),
+  0xfe49: createSymbolObject("atomic.rmw.cmpxchg", "i64", 1),
+  0xfe4a: createSymbolObject("atomic.rmw8_u.cmpxchg_u", "i32", 1),
+  0xfe4b: createSymbolObject("atomic.rmw16_u.cmpxchg_u", "i32", 1),
+  0xfe4c: createSymbolObject("atomic.rmw8_u.cmpxchg_u", "i64", 1),
+  0xfe4d: createSymbolObject("atomic.rmw16_u.cmpxchg_u", "i64", 1),
+  0xfe4e: createSymbolObject("atomic.rmw32_u.cmpxchg_u", "i64", 1)
+};
+var symbolsByName = invertMap(symbolsByByte, function (obj) {
+  if (typeof obj.object === "string") {
+    return "".concat(obj.object, ".").concat(obj.name);
+  }
+
+  return obj.name;
+});
+var _default = {
+  symbolsByByte: symbolsByByte,
+  sections: sections,
+  magicModuleHeader: magicModuleHeader,
+  moduleVersion: moduleVersion,
+  types: types,
+  valtypes: valtypes,
+  exportTypes: exportTypes,
+  blockTypes: blockTypes,
+  tableTypes: tableTypes,
+  globalTypes: globalTypes,
+  importTypes: importTypes,
+  valtypesByString: valtypesByString,
+  globalTypesByString: globalTypesByString,
+  exportTypesByName: exportTypesByName,
+  symbolsByName: symbolsByName
+};
+exports["default"] = _default;

backend/frontend/node_modules/@webassemblyjs/helper-wasm-bytecode/lib/section.js

@@ -0,0 +1,38 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.getSectionForNode = getSectionForNode;
+
+function getSectionForNode(n) {
+  switch (n.type) {
+    case "ModuleImport":
+      return "import";
+
+    case "CallInstruction":
+    case "CallIndirectInstruction":
+    case "Func":
+    case "Instr":
+      return "code";
+
+    case "ModuleExport":
+      return "export";
+
+    case "Start":
+      return "start";
+
+    case "TypeInstruction":
+      return "type";
+
+    case "IndexInFuncSection":
+      return "func";
+
+    case "Global":
+      return "global";
+    // No section
+
+    default:
+      return;
+  }
+}

backend/frontend/node_modules/@webassemblyjs/helper-wasm-section/lib/create.js

@@ -0,0 +1,123 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.createEmptySection = createEmptySection;
+
+var _wasmGen = require("@webassemblyjs/wasm-gen");
+
+var _helperBuffer = require("@webassemblyjs/helper-buffer");
+
+var _helperWasmBytecode = _interopRequireDefault(require("@webassemblyjs/helper-wasm-bytecode"));
+
+var t = _interopRequireWildcard(require("@webassemblyjs/ast"));
+
+function _getRequireWildcardCache(nodeInterop) { if (typeof WeakMap !== "function") return null; var cacheBabelInterop = new WeakMap(); var cacheNodeInterop = new WeakMap(); return (_getRequireWildcardCache = function _getRequireWildcardCache(nodeInterop) { return nodeInterop ? cacheNodeInterop : cacheBabelInterop; })(nodeInterop); }
+
+function _interopRequireWildcard(obj, nodeInterop) { if (!nodeInterop && obj && obj.__esModule) { return obj; } if (obj === null || _typeof(obj) !== "object" && typeof obj !== "function") { return { "default": obj }; } var cache = _getRequireWildcardCache(nodeInterop); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (key !== "default" && Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj["default"] = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { "default": obj }; }
+
+function _typeof(obj) { "@babel/helpers - typeof"; if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }
+
+function findLastSection(ast, forSection) {
+  var targetSectionId = _helperWasmBytecode["default"].sections[forSection]; // $FlowIgnore: metadata can not be empty
+
+  var moduleSections = ast.body[0].metadata.sections;
+  var lastSection;
+  var lastId = 0;
+
+  for (var i = 0, len = moduleSections.length; i < len; i++) {
+    var section = moduleSections[i]; // Ignore custom section since they can actually occur everywhere
+
+    if (section.section === "custom") {
+      continue;
+    }
+
+    var sectionId = _helperWasmBytecode["default"].sections[section.section];
+
+    if (targetSectionId > lastId && targetSectionId < sectionId) {
+      return lastSection;
+    }
+
+    lastId = sectionId;
+    lastSection = section;
+  }
+
+  return lastSection;
+}
+
+function createEmptySection(ast, uint8Buffer, section) {
+  // previous section after which we are going to insert our section
+  var lastSection = findLastSection(ast, section);
+  var start, end;
+  /**
+   * It's the first section
+   */
+
+  if (lastSection == null || lastSection.section === "custom") {
+    start = 8
+    /* wasm header size */
+    ;
+    end = start;
+  } else {
+    start = lastSection.startOffset + lastSection.size.value + 1;
+    end = start;
+  } // section id
+
+
+  start += 1;
+  var sizeStartLoc = {
+    line: -1,
+    column: start
+  };
+  var sizeEndLoc = {
+    line: -1,
+    column: start + 1
+  }; // 1 byte for the empty vector
+
+  var size = t.withLoc(t.numberLiteralFromRaw(1), sizeEndLoc, sizeStartLoc);
+  var vectorOfSizeStartLoc = {
+    line: -1,
+    column: sizeEndLoc.column
+  };
+  var vectorOfSizeEndLoc = {
+    line: -1,
+    column: sizeEndLoc.column + 1
+  };
+  var vectorOfSize = t.withLoc(t.numberLiteralFromRaw(0), vectorOfSizeEndLoc, vectorOfSizeStartLoc);
+  var sectionMetadata = t.sectionMetadata(section, start, size, vectorOfSize);
+  var sectionBytes = (0, _wasmGen.encodeNode)(sectionMetadata);
+  uint8Buffer = (0, _helperBuffer.overrideBytesInBuffer)(uint8Buffer, start - 1, end, sectionBytes); // Add section into the AST for later lookups
+
+  if (_typeof(ast.body[0].metadata) === "object") {
+    // $FlowIgnore: metadata can not be empty
+    ast.body[0].metadata.sections.push(sectionMetadata);
+    t.sortSectionMetadata(ast.body[0]);
+  }
+  /**
+   * Update AST
+   */
+  // Once we hit our section every that is after needs to be shifted by the delta
+
+
+  var deltaBytes = +sectionBytes.length;
+  var encounteredSection = false;
+  t.traverse(ast, {
+    SectionMetadata: function SectionMetadata(path) {
+      if (path.node.section === section) {
+        encounteredSection = true;
+        return;
+      }
+
+      if (encounteredSection === true) {
+        t.shiftSection(ast, path.node, deltaBytes);
+      }
+    }
+  });
+  return {
+    uint8Buffer: uint8Buffer,
+    sectionMetadata: sectionMetadata
+  };
+}

backend/frontend/node_modules/@webassemblyjs/helper-wasm-section/lib/index.js

@@ -0,0 +1,35 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+Object.defineProperty(exports, "resizeSectionByteSize", {
+  enumerable: true,
+  get: function get() {
+    return _resize.resizeSectionByteSize;
+  }
+});
+Object.defineProperty(exports, "resizeSectionVecSize", {
+  enumerable: true,
+  get: function get() {
+    return _resize.resizeSectionVecSize;
+  }
+});
+Object.defineProperty(exports, "createEmptySection", {
+  enumerable: true,
+  get: function get() {
+    return _create.createEmptySection;
+  }
+});
+Object.defineProperty(exports, "removeSections", {
+  enumerable: true,
+  get: function get() {
+    return _remove.removeSections;
+  }
+});
+
+var _resize = require("./resize");
+
+var _create = require("./create");
+
+var _remove = require("./remove");

backend/frontend/node_modules/@webassemblyjs/helper-wasm-section/lib/remove.js

@@ -0,0 +1,45 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.removeSections = removeSections;
+
+var _ast = require("@webassemblyjs/ast");
+
+var _helperBuffer = require("@webassemblyjs/helper-buffer");
+
+function removeSections(ast, uint8Buffer, section) {
+  var sectionMetadatas = (0, _ast.getSectionMetadatas)(ast, section);
+
+  if (sectionMetadatas.length === 0) {
+    throw new Error("Section metadata not found");
+  }
+
+  return sectionMetadatas.reverse().reduce(function (uint8Buffer, sectionMetadata) {
+    var startsIncludingId = sectionMetadata.startOffset - 1;
+    var ends = section === "start" ? sectionMetadata.size.loc.end.column + 1 : sectionMetadata.startOffset + sectionMetadata.size.value + 1;
+    var delta = -(ends - startsIncludingId);
+    /**
+     * update AST
+     */
+    // Once we hit our section every that is after needs to be shifted by the delta
+
+    var encounteredSection = false;
+    (0, _ast.traverse)(ast, {
+      SectionMetadata: function SectionMetadata(path) {
+        if (path.node.section === section) {
+          encounteredSection = true;
+          return path.remove();
+        }
+
+        if (encounteredSection === true) {
+          (0, _ast.shiftSection)(ast, path.node, delta);
+        }
+      }
+    }); // replacement is nothing
+
+    var replacement = [];
+    return (0, _helperBuffer.overrideBytesInBuffer)(uint8Buffer, startsIncludingId, ends, replacement);
+  }, uint8Buffer);
+}

backend/frontend/node_modules/@webassemblyjs/helper-wasm-section/lib/resize.js

@@ -0,0 +1,90 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.resizeSectionByteSize = resizeSectionByteSize;
+exports.resizeSectionVecSize = resizeSectionVecSize;
+
+var _wasmGen = require("@webassemblyjs/wasm-gen");
+
+var _ast = require("@webassemblyjs/ast");
+
+var _helperBuffer = require("@webassemblyjs/helper-buffer");
+
+function resizeSectionByteSize(ast, uint8Buffer, section, deltaBytes) {
+  var sectionMetadata = (0, _ast.getSectionMetadata)(ast, section);
+
+  if (typeof sectionMetadata === "undefined") {
+    throw new Error("Section metadata not found");
+  }
+
+  if (typeof sectionMetadata.size.loc === "undefined") {
+    throw new Error("SectionMetadata " + section + " has no loc");
+  } // keep old node location to be overriden
+
+
+  var start = sectionMetadata.size.loc.start.column;
+  var end = sectionMetadata.size.loc.end.column;
+  var newSectionSize = sectionMetadata.size.value + deltaBytes;
+  var newBytes = (0, _wasmGen.encodeU32)(newSectionSize);
+  /**
+   * update AST
+   */
+
+  sectionMetadata.size.value = newSectionSize;
+  var oldu32EncodedLen = end - start;
+  var newu32EncodedLen = newBytes.length; // the new u32 has a different encoded length
+
+  if (newu32EncodedLen !== oldu32EncodedLen) {
+    var deltaInSizeEncoding = newu32EncodedLen - oldu32EncodedLen;
+    sectionMetadata.size.loc.end.column = start + newu32EncodedLen;
+    deltaBytes += deltaInSizeEncoding; // move the vec size pointer size the section size is now smaller
+
+    sectionMetadata.vectorOfSize.loc.start.column += deltaInSizeEncoding;
+    sectionMetadata.vectorOfSize.loc.end.column += deltaInSizeEncoding;
+  } // Once we hit our section every that is after needs to be shifted by the delta
+
+
+  var encounteredSection = false;
+  (0, _ast.traverse)(ast, {
+    SectionMetadata: function SectionMetadata(path) {
+      if (path.node.section === section) {
+        encounteredSection = true;
+        return;
+      }
+
+      if (encounteredSection === true) {
+        (0, _ast.shiftSection)(ast, path.node, deltaBytes);
+      }
+    }
+  });
+  return (0, _helperBuffer.overrideBytesInBuffer)(uint8Buffer, start, end, newBytes);
+}
+
+function resizeSectionVecSize(ast, uint8Buffer, section, deltaElements) {
+  var sectionMetadata = (0, _ast.getSectionMetadata)(ast, section);
+
+  if (typeof sectionMetadata === "undefined") {
+    throw new Error("Section metadata not found");
+  }
+
+  if (typeof sectionMetadata.vectorOfSize.loc === "undefined") {
+    throw new Error("SectionMetadata " + section + " has no loc");
+  } // Section has no vector
+
+
+  if (sectionMetadata.vectorOfSize.value === -1) {
+    return uint8Buffer;
+  } // keep old node location to be overriden
+
+
+  var start = sectionMetadata.vectorOfSize.loc.start.column;
+  var end = sectionMetadata.vectorOfSize.loc.end.column;
+  var newValue = sectionMetadata.vectorOfSize.value + deltaElements;
+  var newBytes = (0, _wasmGen.encodeU32)(newValue); // Update AST
+
+  sectionMetadata.vectorOfSize.value = newValue;
+  sectionMetadata.vectorOfSize.loc.end.column = start + newBytes.length;
+  return (0, _helperBuffer.overrideBytesInBuffer)(uint8Buffer, start, end, newBytes);
+}

backend/frontend/node_modules/@webassemblyjs/ieee754/lib/index.js

@@ -0,0 +1,52 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.encodeF32 = encodeF32;
+exports.encodeF64 = encodeF64;
+exports.decodeF32 = decodeF32;
+exports.decodeF64 = decodeF64;
+exports.DOUBLE_PRECISION_MANTISSA = exports.SINGLE_PRECISION_MANTISSA = exports.NUMBER_OF_BYTE_F64 = exports.NUMBER_OF_BYTE_F32 = void 0;
+
+var _ieee = require("@xtuc/ieee754");
+
+/**
+ * According to https://webassembly.github.io/spec/binary/values.html#binary-float
+ * n = 32/8
+ */
+var NUMBER_OF_BYTE_F32 = 4;
+/**
+ * According to https://webassembly.github.io/spec/binary/values.html#binary-float
+ * n = 64/8
+ */
+
+exports.NUMBER_OF_BYTE_F32 = NUMBER_OF_BYTE_F32;
+var NUMBER_OF_BYTE_F64 = 8;
+exports.NUMBER_OF_BYTE_F64 = NUMBER_OF_BYTE_F64;
+var SINGLE_PRECISION_MANTISSA = 23;
+exports.SINGLE_PRECISION_MANTISSA = SINGLE_PRECISION_MANTISSA;
+var DOUBLE_PRECISION_MANTISSA = 52;
+exports.DOUBLE_PRECISION_MANTISSA = DOUBLE_PRECISION_MANTISSA;
+
+function encodeF32(v) {
+  var buffer = [];
+  (0, _ieee.write)(buffer, v, 0, true, SINGLE_PRECISION_MANTISSA, NUMBER_OF_BYTE_F32);
+  return buffer;
+}
+
+function encodeF64(v) {
+  var buffer = [];
+  (0, _ieee.write)(buffer, v, 0, true, DOUBLE_PRECISION_MANTISSA, NUMBER_OF_BYTE_F64);
+  return buffer;
+}
+
+function decodeF32(bytes) {
+  var buffer = new Uint8Array(bytes);
+  return (0, _ieee.read)(buffer, 0, true, SINGLE_PRECISION_MANTISSA, NUMBER_OF_BYTE_F32);
+}
+
+function decodeF64(bytes) {
+  var buffer = new Uint8Array(bytes);
+  return (0, _ieee.read)(buffer, 0, true, DOUBLE_PRECISION_MANTISSA, NUMBER_OF_BYTE_F64);
+}

backend/frontend/node_modules/@webassemblyjs/leb128/lib/bits.js

@@ -0,0 +1,156 @@
+// Copyright 2012 The Obvious Corporation.
+
+/*
+ * bits: Bitwise buffer utilities. The utilities here treat a buffer
+ * as a little-endian bigint, so the lowest-order bit is bit #0 of
+ * `buffer[0]`, and the highest-order bit is bit #7 of
+ * `buffer[buffer.length - 1]`.
+ */
+
+/*
+ * Modules used
+ */
+"use strict";
+/*
+ * Exported bindings
+ */
+
+/**
+ * Extracts the given number of bits from the buffer at the indicated
+ * index, returning a simple number as the result. If bits are requested
+ * that aren't covered by the buffer, the `defaultBit` is used as their
+ * value.
+ *
+ * The `bitLength` must be no more than 32. The `defaultBit` if not
+ * specified is taken to be `0`.
+ */
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.extract = extract;
+exports.inject = inject;
+exports.getSign = getSign;
+exports.highOrder = highOrder;
+
+function extract(buffer, bitIndex, bitLength, defaultBit) {
+  if (bitLength < 0 || bitLength > 32) {
+    throw new Error("Bad value for bitLength.");
+  }
+
+  if (defaultBit === undefined) {
+    defaultBit = 0;
+  } else if (defaultBit !== 0 && defaultBit !== 1) {
+    throw new Error("Bad value for defaultBit.");
+  }
+
+  var defaultByte = defaultBit * 0xff;
+  var result = 0; // All starts are inclusive. The {endByte, endBit} pair is exclusive, but
+  // if endBit !== 0, then endByte is inclusive.
+
+  var lastBit = bitIndex + bitLength;
+  var startByte = Math.floor(bitIndex / 8);
+  var startBit = bitIndex % 8;
+  var endByte = Math.floor(lastBit / 8);
+  var endBit = lastBit % 8;
+
+  if (endBit !== 0) {
+    // `(1 << endBit) - 1` is the mask of all bits up to but not including
+    // the endBit.
+    result = get(endByte) & (1 << endBit) - 1;
+  }
+
+  while (endByte > startByte) {
+    endByte--;
+    result = result << 8 | get(endByte);
+  }
+
+  result >>>= startBit;
+  return result;
+
+  function get(index) {
+    var result = buffer[index];
+    return result === undefined ? defaultByte : result;
+  }
+}
+/**
+ * Injects the given bits into the given buffer at the given index. Any
+ * bits in the value beyond the length to set are ignored.
+ */
+
+
+function inject(buffer, bitIndex, bitLength, value) {
+  if (bitLength < 0 || bitLength > 32) {
+    throw new Error("Bad value for bitLength.");
+  }
+
+  var lastByte = Math.floor((bitIndex + bitLength - 1) / 8);
+
+  if (bitIndex < 0 || lastByte >= buffer.length) {
+    throw new Error("Index out of range.");
+  } // Just keeping it simple, until / unless profiling shows that this
+  // is a problem.
+
+
+  var atByte = Math.floor(bitIndex / 8);
+  var atBit = bitIndex % 8;
+
+  while (bitLength > 0) {
+    if (value & 1) {
+      buffer[atByte] |= 1 << atBit;
+    } else {
+      buffer[atByte] &= ~(1 << atBit);
+    }
+
+    value >>= 1;
+    bitLength--;
+    atBit = (atBit + 1) % 8;
+
+    if (atBit === 0) {
+      atByte++;
+    }
+  }
+}
+/**
+ * Gets the sign bit of the given buffer.
+ */
+
+
+function getSign(buffer) {
+  return buffer[buffer.length - 1] >>> 7;
+}
+/**
+ * Gets the zero-based bit number of the highest-order bit with the
+ * given value in the given buffer.
+ *
+ * If the buffer consists entirely of the other bit value, then this returns
+ * `-1`.
+ */
+
+
+function highOrder(bit, buffer) {
+  var length = buffer.length;
+  var fullyWrongByte = (bit ^ 1) * 0xff; // the other-bit extended to a full byte
+
+  while (length > 0 && buffer[length - 1] === fullyWrongByte) {
+    length--;
+  }
+
+  if (length === 0) {
+    // Degenerate case. The buffer consists entirely of ~bit.
+    return -1;
+  }
+
+  var byteToCheck = buffer[length - 1];
+  var result = length * 8 - 1;
+
+  for (var i = 7; i > 0; i--) {
+    if ((byteToCheck >> i & 1) === bit) {
+      break;
+    }
+
+    result--;
+  }
+
+  return result;
+}

backend/frontend/node_modules/@webassemblyjs/leb128/lib/bufs.js

@@ -0,0 +1,246 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.alloc = alloc;
+exports.free = free;
+exports.resize = resize;
+exports.readInt = readInt;
+exports.readUInt = readUInt;
+exports.writeInt64 = writeInt64;
+exports.writeUInt64 = writeUInt64;
+// Copyright 2012 The Obvious Corporation.
+
+/*
+ * bufs: Buffer utilities.
+ */
+
+/*
+ * Module variables
+ */
+
+/** Pool of buffers, where `bufPool[x].length === x`. */
+var bufPool = [];
+/** Maximum length of kept temporary buffers. */
+
+var TEMP_BUF_MAXIMUM_LENGTH = 20;
+/** Minimum exactly-representable 64-bit int. */
+
+var MIN_EXACT_INT64 = -0x8000000000000000;
+/** Maximum exactly-representable 64-bit int. */
+
+var MAX_EXACT_INT64 = 0x7ffffffffffffc00;
+/** Maximum exactly-representable 64-bit uint. */
+
+var MAX_EXACT_UINT64 = 0xfffffffffffff800;
+/**
+ * The int value consisting just of a 1 in bit #32 (that is, one more
+ * than the maximum 32-bit unsigned value).
+ */
+
+var BIT_32 = 0x100000000;
+/**
+ * The int value consisting just of a 1 in bit #64 (that is, one more
+ * than the maximum 64-bit unsigned value).
+ */
+
+var BIT_64 = 0x10000000000000000;
+/*
+ * Helper functions
+ */
+
+/**
+ * Masks off all but the lowest bit set of the given number.
+ */
+
+function lowestBit(num) {
+  return num & -num;
+}
+/**
+ * Gets whether trying to add the second number to the first is lossy
+ * (inexact). The first number is meant to be an accumulated result.
+ */
+
+
+function isLossyToAdd(accum, num) {
+  if (num === 0) {
+    return false;
+  }
+
+  var lowBit = lowestBit(num);
+  var added = accum + lowBit;
+
+  if (added === accum) {
+    return true;
+  }
+
+  if (added - lowBit !== accum) {
+    return true;
+  }
+
+  return false;
+}
+/*
+ * Exported functions
+ */
+
+/**
+ * Allocates a buffer of the given length, which is initialized
+ * with all zeroes. This returns a buffer from the pool if it is
+ * available, or a freshly-allocated buffer if not.
+ */
+
+
+function alloc(length) {
+  var result = bufPool[length];
+
+  if (result) {
+    bufPool[length] = undefined;
+  } else {
+    result = new Uint8Array(length);
+  }
+
+  result.fill(0);
+  return result;
+}
+/**
+ * Releases a buffer back to the pool.
+ */
+
+
+function free(buffer) {
+  var length = buffer.length;
+
+  if (length < TEMP_BUF_MAXIMUM_LENGTH) {
+    bufPool[length] = buffer;
+  }
+}
+/**
+ * Resizes a buffer, returning a new buffer. Returns the argument if
+ * the length wouldn't actually change. This function is only safe to
+ * use if the given buffer was allocated within this module (since
+ * otherwise the buffer might possibly be shared externally).
+ */
+
+
+function resize(buffer, length) {
+  if (length === buffer.length) {
+    return buffer;
+  }
+
+  var newBuf = alloc(length);
+
+  for (var i = 0; i <= buffer.length; i++) {
+    newBuf[i] = buffer[i];
+  }
+
+  free(buffer);
+  return newBuf;
+}
+/**
+ * Reads an arbitrary signed int from a buffer.
+ */
+
+
+function readInt(buffer) {
+  var length = buffer.length;
+  var positive = buffer[length - 1] < 0x80;
+  var result = positive ? 0 : -1;
+  var lossy = false; // Note: We can't use bit manipulation here, since that stops
+  // working if the result won't fit in a 32-bit int.
+
+  if (length < 7) {
+    // Common case which can't possibly be lossy (because the result has
+    // no more than 48 bits, and loss only happens with 54 or more).
+    for (var i = length - 1; i >= 0; i--) {
+      result = result * 0x100 + buffer[i];
+    }
+  } else {
+    for (var _i = length - 1; _i >= 0; _i--) {
+      var one = buffer[_i];
+      result *= 0x100;
+
+      if (isLossyToAdd(result, one)) {
+        lossy = true;
+      }
+
+      result += one;
+    }
+  }
+
+  return {
+    value: result,
+    lossy: lossy
+  };
+}
+/**
+ * Reads an arbitrary unsigned int from a buffer.
+ */
+
+
+function readUInt(buffer) {
+  var length = buffer.length;
+  var result = 0;
+  var lossy = false; // Note: See above in re bit manipulation.
+
+  if (length < 7) {
+    // Common case which can't possibly be lossy (see above).
+    for (var i = length - 1; i >= 0; i--) {
+      result = result * 0x100 + buffer[i];
+    }
+  } else {
+    for (var _i2 = length - 1; _i2 >= 0; _i2--) {
+      var one = buffer[_i2];
+      result *= 0x100;
+
+      if (isLossyToAdd(result, one)) {
+        lossy = true;
+      }
+
+      result += one;
+    }
+  }
+
+  return {
+    value: result,
+    lossy: lossy
+  };
+}
+/**
+ * Writes a little-endian 64-bit signed int into a buffer.
+ */
+
+
+function writeInt64(value, buffer) {
+  if (value < MIN_EXACT_INT64 || value > MAX_EXACT_INT64) {
+    throw new Error("Value out of range.");
+  }
+
+  if (value < 0) {
+    value += BIT_64;
+  }
+
+  writeUInt64(value, buffer);
+}
+/**
+ * Writes a little-endian 64-bit unsigned int into a buffer.
+ */
+
+
+function writeUInt64(value, buffer) {
+  if (value < 0 || value > MAX_EXACT_UINT64) {
+    throw new Error("Value out of range.");
+  }
+
+  var lowWord = value % BIT_32;
+  var highWord = Math.floor(value / BIT_32);
+  buffer[0] = lowWord & 0xff;
+  buffer[1] = lowWord >> 8 & 0xff;
+  buffer[2] = lowWord >> 16 & 0xff;
+  buffer[3] = lowWord >> 24 & 0xff;
+  buffer[4] = highWord & 0xff;
+  buffer[5] = highWord >> 8 & 0xff;
+  buffer[6] = highWord >> 16 & 0xff;
+  buffer[7] = highWord >> 24 & 0xff;
+}

backend/frontend/node_modules/@webassemblyjs/leb128/lib/index.js

@@ -0,0 +1,59 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.decodeInt64 = decodeInt64;
+exports.decodeUInt64 = decodeUInt64;
+exports.decodeInt32 = decodeInt32;
+exports.decodeUInt32 = decodeUInt32;
+exports.encodeU32 = encodeU32;
+exports.encodeI32 = encodeI32;
+exports.encodeI64 = encodeI64;
+exports.MAX_NUMBER_OF_BYTE_U64 = exports.MAX_NUMBER_OF_BYTE_U32 = void 0;
+
+var _leb = _interopRequireDefault(require("./leb"));
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { "default": obj }; }
+
+/**
+ * According to https://webassembly.github.io/spec/core/binary/values.html#binary-int
+ * max = ceil(32/7)
+ */
+var MAX_NUMBER_OF_BYTE_U32 = 5;
+/**
+ * According to https://webassembly.github.io/spec/core/binary/values.html#binary-int
+ * max = ceil(64/7)
+ */
+
+exports.MAX_NUMBER_OF_BYTE_U32 = MAX_NUMBER_OF_BYTE_U32;
+var MAX_NUMBER_OF_BYTE_U64 = 10;
+exports.MAX_NUMBER_OF_BYTE_U64 = MAX_NUMBER_OF_BYTE_U64;
+
+function decodeInt64(encodedBuffer, index) {
+  return _leb["default"].decodeInt64(encodedBuffer, index);
+}
+
+function decodeUInt64(encodedBuffer, index) {
+  return _leb["default"].decodeUInt64(encodedBuffer, index);
+}
+
+function decodeInt32(encodedBuffer, index) {
+  return _leb["default"].decodeInt32(encodedBuffer, index);
+}
+
+function decodeUInt32(encodedBuffer, index) {
+  return _leb["default"].decodeUInt32(encodedBuffer, index);
+}
+
+function encodeU32(v) {
+  return _leb["default"].encodeUInt32(v);
+}
+
+function encodeI32(v) {
+  return _leb["default"].encodeInt32(v);
+}
+
+function encodeI64(v) {
+  return _leb["default"].encodeInt64(v);
+}

backend/frontend/node_modules/@webassemblyjs/leb128/lib/leb.js

@@ -0,0 +1,347 @@
+// Copyright 2012 The Obvious Corporation.
+
+/*
+ * leb: LEB128 utilities.
+ */
+
+/*
+ * Modules used
+ */
+"use strict";
+
+function _typeof(obj) { "@babel/helpers - typeof"; if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports["default"] = void 0;
+
+var _long = _interopRequireDefault(require("@xtuc/long"));
+
+var bits = _interopRequireWildcard(require("./bits"));
+
+var bufs = _interopRequireWildcard(require("./bufs"));
+
+function _getRequireWildcardCache(nodeInterop) { if (typeof WeakMap !== "function") return null; var cacheBabelInterop = new WeakMap(); var cacheNodeInterop = new WeakMap(); return (_getRequireWildcardCache = function _getRequireWildcardCache(nodeInterop) { return nodeInterop ? cacheNodeInterop : cacheBabelInterop; })(nodeInterop); }
+
+function _interopRequireWildcard(obj, nodeInterop) { if (!nodeInterop && obj && obj.__esModule) { return obj; } if (obj === null || _typeof(obj) !== "object" && typeof obj !== "function") { return { "default": obj }; } var cache = _getRequireWildcardCache(nodeInterop); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (key !== "default" && Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj["default"] = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { "default": obj }; }
+
+/*
+ * Module variables
+ */
+
+/** The minimum possible 32-bit signed int. */
+var MIN_INT32 = -0x80000000;
+/** The maximum possible 32-bit signed int. */
+
+var MAX_INT32 = 0x7fffffff;
+/** The maximum possible 32-bit unsigned int. */
+
+var MAX_UINT32 = 0xffffffff;
+/** The minimum possible 64-bit signed int. */
+// const MIN_INT64 = -0x8000000000000000;
+
+/**
+ * The maximum possible 64-bit signed int that is representable as a
+ * JavaScript number.
+ */
+// const MAX_INT64 = 0x7ffffffffffffc00;
+
+/**
+ * The maximum possible 64-bit unsigned int that is representable as a
+ * JavaScript number.
+ */
+// const MAX_UINT64 = 0xfffffffffffff800;
+
+/*
+ * Helper functions
+ */
+
+/**
+ * Determines the number of bits required to encode the number
+ * represented in the given buffer as a signed value. The buffer is
+ * taken to represent a signed number in little-endian form.
+ *
+ * The number of bits to encode is the (zero-based) bit number of the
+ * highest-order non-sign-matching bit, plus two. For example:
+ *
+ *   11111011 01110101
+ *   high          low
+ *
+ * The sign bit here is 1 (that is, it's a negative number). The highest
+ * bit number that doesn't match the sign is bit #10 (where the lowest-order
+ * bit is bit #0). So, we have to encode at least 12 bits total.
+ *
+ * As a special degenerate case, the numbers 0 and -1 each require just one bit.
+ */
+
+function signedBitCount(buffer) {
+  return bits.highOrder(bits.getSign(buffer) ^ 1, buffer) + 2;
+}
+/**
+ * Determines the number of bits required to encode the number
+ * represented in the given buffer as an unsigned value. The buffer is
+ * taken to represent an unsigned number in little-endian form.
+ *
+ * The number of bits to encode is the (zero-based) bit number of the
+ * highest-order 1 bit, plus one. For example:
+ *
+ *   00011000 01010011
+ *   high          low
+ *
+ * The highest-order 1 bit here is bit #12 (where the lowest-order bit
+ * is bit #0). So, we have to encode at least 13 bits total.
+ *
+ * As a special degenerate case, the number 0 requires 1 bit.
+ */
+
+
+function unsignedBitCount(buffer) {
+  var result = bits.highOrder(1, buffer) + 1;
+  return result ? result : 1;
+}
+/**
+ * Common encoder for both signed and unsigned ints. This takes a
+ * bigint-ish buffer, returning an LEB128-encoded buffer.
+ */
+
+
+function encodeBufferCommon(buffer, signed) {
+  var signBit;
+  var bitCount;
+
+  if (signed) {
+    signBit = bits.getSign(buffer);
+    bitCount = signedBitCount(buffer);
+  } else {
+    signBit = 0;
+    bitCount = unsignedBitCount(buffer);
+  }
+
+  var byteCount = Math.ceil(bitCount / 7);
+  var result = bufs.alloc(byteCount);
+
+  for (var i = 0; i < byteCount; i++) {
+    var payload = bits.extract(buffer, i * 7, 7, signBit);
+    result[i] = payload | 0x80;
+  } // Mask off the top bit of the last byte, to indicate the end of the
+  // encoding.
+
+
+  result[byteCount - 1] &= 0x7f;
+  return result;
+}
+/**
+ * Gets the byte-length of the value encoded in the given buffer at
+ * the given index.
+ */
+
+
+function encodedLength(encodedBuffer, index) {
+  var result = 0;
+
+  while (encodedBuffer[index + result] >= 0x80) {
+    result++;
+  }
+
+  result++; // to account for the last byte
+
+  if (index + result > encodedBuffer.length) {// FIXME(sven): seems to cause false positives
+    // throw new Error("integer representation too long");
+  }
+
+  return result;
+}
+/**
+ * Common decoder for both signed and unsigned ints. This takes an
+ * LEB128-encoded buffer, returning a bigint-ish buffer.
+ */
+
+
+function decodeBufferCommon(encodedBuffer, index, signed) {
+  index = index === undefined ? 0 : index;
+  var length = encodedLength(encodedBuffer, index);
+  var bitLength = length * 7;
+  var byteLength = Math.ceil(bitLength / 8);
+  var result = bufs.alloc(byteLength);
+  var outIndex = 0;
+
+  while (length > 0) {
+    bits.inject(result, outIndex, 7, encodedBuffer[index]);
+    outIndex += 7;
+    index++;
+    length--;
+  }
+
+  var signBit;
+  var signByte;
+
+  if (signed) {
+    // Sign-extend the last byte.
+    var lastByte = result[byteLength - 1];
+    var endBit = outIndex % 8;
+
+    if (endBit !== 0) {
+      var shift = 32 - endBit; // 32 because JS bit ops work on 32-bit ints.
+
+      lastByte = result[byteLength - 1] = lastByte << shift >> shift & 0xff;
+    }
+
+    signBit = lastByte >> 7;
+    signByte = signBit * 0xff;
+  } else {
+    signBit = 0;
+    signByte = 0;
+  } // Slice off any superfluous bytes, that is, ones that add no meaningful
+  // bits (because the value would be the same if they were removed).
+
+
+  while (byteLength > 1 && result[byteLength - 1] === signByte && (!signed || result[byteLength - 2] >> 7 === signBit)) {
+    byteLength--;
+  }
+
+  result = bufs.resize(result, byteLength);
+  return {
+    value: result,
+    nextIndex: index
+  };
+}
+/*
+ * Exported bindings
+ */
+
+
+function encodeIntBuffer(buffer) {
+  return encodeBufferCommon(buffer, true);
+}
+
+function decodeIntBuffer(encodedBuffer, index) {
+  return decodeBufferCommon(encodedBuffer, index, true);
+}
+
+function encodeInt32(num) {
+  var buf = new Uint8Array(4);
+  buf[0] = num & 0xff;
+  buf[1] = num >> 8 & 0xff;
+  buf[2] = num >> 16 & 0xff;
+  buf[3] = num >> 24 & 0xff;
+  var result = encodeIntBuffer(buf);
+  return result;
+}
+
+function decodeInt32(encodedBuffer, index) {
+  var result = decodeIntBuffer(encodedBuffer, index);
+  var parsed = bufs.readInt(result.value);
+  var value = parsed.value;
+  bufs.free(result.value);
+
+  if (value < MIN_INT32 || value > MAX_INT32) {
+    throw new Error("integer too large");
+  }
+
+  return {
+    value: value,
+    nextIndex: result.nextIndex
+  };
+}
+
+function encodeInt64(num) {
+  var buf = bufs.alloc(8);
+  bufs.writeInt64(num, buf);
+  var result = encodeIntBuffer(buf);
+  bufs.free(buf);
+  return result;
+}
+
+function decodeInt64(encodedBuffer, index) {
+  var result = decodeIntBuffer(encodedBuffer, index); // sign-extend if necessary
+
+  var length = result.value.length;
+
+  if (result.value[length - 1] >> 7) {
+    result.value = bufs.resize(result.value, 8);
+    result.value.fill(255, length);
+  }
+
+  var value = _long["default"].fromBytesLE(result.value, false);
+
+  bufs.free(result.value);
+  return {
+    value: value,
+    nextIndex: result.nextIndex,
+    lossy: false
+  };
+}
+
+function encodeUIntBuffer(buffer) {
+  return encodeBufferCommon(buffer, false);
+}
+
+function decodeUIntBuffer(encodedBuffer, index) {
+  return decodeBufferCommon(encodedBuffer, index, false);
+}
+
+function encodeUInt32(num) {
+  var buf = new Uint8Array(4);
+  buf[0] = num & 0xff;
+  buf[1] = num >> 8 & 0xff;
+  buf[2] = num >> 16 & 0xff;
+  buf[3] = num >> 24 & 0xff;
+  var result = encodeUIntBuffer(buf);
+  return result;
+}
+
+function decodeUInt32(encodedBuffer, index) {
+  var result = decodeUIntBuffer(encodedBuffer, index);
+  var parsed = bufs.readUInt(result.value);
+  var value = parsed.value;
+  bufs.free(result.value);
+
+  if (value > MAX_UINT32) {
+    throw new Error("integer too large");
+  }
+
+  return {
+    value: value,
+    nextIndex: result.nextIndex
+  };
+}
+
+function encodeUInt64(num) {
+  var buf = bufs.alloc(8);
+  bufs.writeUInt64(num, buf);
+  var result = encodeUIntBuffer(buf);
+  bufs.free(buf);
+  return result;
+}
+
+function decodeUInt64(encodedBuffer, index) {
+  var result = decodeUIntBuffer(encodedBuffer, index);
+
+  var value = _long["default"].fromBytesLE(result.value, true);
+
+  bufs.free(result.value);
+  return {
+    value: value,
+    nextIndex: result.nextIndex,
+    lossy: false
+  };
+}
+
+var _default = {
+  decodeInt32: decodeInt32,
+  decodeInt64: decodeInt64,
+  decodeIntBuffer: decodeIntBuffer,
+  decodeUInt32: decodeUInt32,
+  decodeUInt64: decodeUInt64,
+  decodeUIntBuffer: decodeUIntBuffer,
+  encodeInt32: encodeInt32,
+  encodeInt64: encodeInt64,
+  encodeIntBuffer: encodeIntBuffer,
+  encodeUInt32: encodeUInt32,
+  encodeUInt64: encodeUInt64,
+  encodeUIntBuffer: encodeUIntBuffer
+};
+exports["default"] = _default;

backend/frontend/node_modules/@webassemblyjs/utf8/lib/decoder.js

@@ -0,0 +1,74 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.decode = decode;
+
+function con(b) {
+  if ((b & 0xc0) === 0x80) {
+    return b & 0x3f;
+  } else {
+    throw new Error("invalid UTF-8 encoding");
+  }
+}
+
+function code(min, n) {
+  if (n < min || 0xd800 <= n && n < 0xe000 || n >= 0x10000) {
+    throw new Error("invalid UTF-8 encoding");
+  } else {
+    return n;
+  }
+}
+
+function decode(bytes) {
+  return _decode(bytes).map(function (x) {
+    return String.fromCharCode(x);
+  }).join("");
+}
+
+function _decode(bytes) {
+  var result = [];
+
+  while (bytes.length > 0) {
+    var b1 = bytes[0];
+
+    if (b1 < 0x80) {
+      result.push(code(0x0, b1));
+      bytes = bytes.slice(1);
+      continue;
+    }
+
+    if (b1 < 0xc0) {
+      throw new Error("invalid UTF-8 encoding");
+    }
+
+    var b2 = bytes[1];
+
+    if (b1 < 0xe0) {
+      result.push(code(0x80, ((b1 & 0x1f) << 6) + con(b2)));
+      bytes = bytes.slice(2);
+      continue;
+    }
+
+    var b3 = bytes[2];
+
+    if (b1 < 0xf0) {
+      result.push(code(0x800, ((b1 & 0x0f) << 12) + (con(b2) << 6) + con(b3)));
+      bytes = bytes.slice(3);
+      continue;
+    }
+
+    var b4 = bytes[3];
+
+    if (b1 < 0xf8) {
+      result.push(code(0x10000, (((b1 & 0x07) << 18) + con(b2) << 12) + (con(b3) << 6) + con(b4)));
+      bytes = bytes.slice(4);
+      continue;
+    }
+
+    throw new Error("invalid UTF-8 encoding");
+  }
+
+  return result;
+}

backend/frontend/node_modules/@webassemblyjs/utf8/lib/encoder.js

@@ -0,0 +1,67 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.encode = encode;
+
+function _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _unsupportedIterableToArray(arr) || _nonIterableSpread(); }
+
+function _nonIterableSpread() { throw new TypeError("Invalid attempt to spread non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); }
+
+function _arrayWithoutHoles(arr) { if (Array.isArray(arr)) return _arrayLikeToArray(arr); }
+
+function _toArray(arr) { return _arrayWithHoles(arr) || _iterableToArray(arr) || _unsupportedIterableToArray(arr) || _nonIterableRest(); }
+
+function _nonIterableRest() { throw new TypeError("Invalid attempt to destructure non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); }
+
+function _unsupportedIterableToArray(o, minLen) { if (!o) return; if (typeof o === "string") return _arrayLikeToArray(o, minLen); var n = Object.prototype.toString.call(o).slice(8, -1); if (n === "Object" && o.constructor) n = o.constructor.name; if (n === "Map" || n === "Set") return Array.from(o); if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen); }
+
+function _arrayLikeToArray(arr, len) { if (len == null || len > arr.length) len = arr.length; for (var i = 0, arr2 = new Array(len); i < len; i++) { arr2[i] = arr[i]; } return arr2; }
+
+function _iterableToArray(iter) { if (typeof Symbol !== "undefined" && iter[Symbol.iterator] != null || iter["@@iterator"] != null) return Array.from(iter); }
+
+function _arrayWithHoles(arr) { if (Array.isArray(arr)) return arr; }
+
+function con(n) {
+  return 0x80 | n & 0x3f;
+}
+
+function encode(str) {
+  var arr = str.split("").map(function (x) {
+    return x.charCodeAt(0);
+  });
+  return _encode(arr);
+}
+
+function _encode(arr) {
+  if (arr.length === 0) {
+    return [];
+  }
+
+  var _arr = _toArray(arr),
+      n = _arr[0],
+      ns = _arr.slice(1);
+
+  if (n < 0) {
+    throw new Error("utf8");
+  }
+
+  if (n < 0x80) {
+    return [n].concat(_toConsumableArray(_encode(ns)));
+  }
+
+  if (n < 0x800) {
+    return [0xc0 | n >>> 6, con(n)].concat(_toConsumableArray(_encode(ns)));
+  }
+
+  if (n < 0x10000) {
+    return [0xe0 | n >>> 12, con(n >>> 6), con(n)].concat(_toConsumableArray(_encode(ns)));
+  }
+
+  if (n < 0x110000) {
+    return [0xf0 | n >>> 18, con(n >>> 12), con(n >>> 6), con(n)].concat(_toConsumableArray(_encode(ns)));
+  }
+
+  throw new Error("utf8");
+}

backend/frontend/node_modules/@webassemblyjs/utf8/lib/index.js

@@ -0,0 +1,21 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+Object.defineProperty(exports, "decode", {
+  enumerable: true,
+  get: function get() {
+    return _decoder.decode;
+  }
+});
+Object.defineProperty(exports, "encode", {
+  enumerable: true,
+  get: function get() {
+    return _encoder.encode;
+  }
+});
+
+var _decoder = require("./decoder");
+
+var _encoder = require("./encoder");

backend/frontend/node_modules/@webassemblyjs/wasm-edit/lib/apply.js

@@ -0,0 +1,318 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.applyOperations = applyOperations;
+
+var _wasmGen = require("@webassemblyjs/wasm-gen");
+
+var _encoder = require("@webassemblyjs/wasm-gen/lib/encoder");
+
+var _ast = require("@webassemblyjs/ast");
+
+var _helperWasmSection = require("@webassemblyjs/helper-wasm-section");
+
+var _helperBuffer = require("@webassemblyjs/helper-buffer");
+
+var _helperWasmBytecode = require("@webassemblyjs/helper-wasm-bytecode");
+
+function _slicedToArray(arr, i) { return _arrayWithHoles(arr) || _iterableToArrayLimit(arr, i) || _unsupportedIterableToArray(arr, i) || _nonIterableRest(); }
+
+function _nonIterableRest() { throw new TypeError("Invalid attempt to destructure non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); }
+
+function _unsupportedIterableToArray(o, minLen) { if (!o) return; if (typeof o === "string") return _arrayLikeToArray(o, minLen); var n = Object.prototype.toString.call(o).slice(8, -1); if (n === "Object" && o.constructor) n = o.constructor.name; if (n === "Map" || n === "Set") return Array.from(o); if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen); }
+
+function _arrayLikeToArray(arr, len) { if (len == null || len > arr.length) len = arr.length; for (var i = 0, arr2 = new Array(len); i < len; i++) { arr2[i] = arr[i]; } return arr2; }
+
+function _iterableToArrayLimit(arr, i) { var _i = arr == null ? null : typeof Symbol !== "undefined" && arr[Symbol.iterator] || arr["@@iterator"]; if (_i == null) return; var _arr = []; var _n = true; var _d = false; var _s, _e; try { for (_i = _i.call(arr); !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i["return"] != null) _i["return"](); } finally { if (_d) throw _e; } } return _arr; }
+
+function _arrayWithHoles(arr) { if (Array.isArray(arr)) return arr; }
+
+function shiftLocNodeByDelta(node, delta) {
+  (0, _ast.assertHasLoc)(node); // $FlowIgnore: assertHasLoc ensures that
+
+  node.loc.start.column += delta; // $FlowIgnore: assertHasLoc ensures that
+
+  node.loc.end.column += delta;
+}
+
+function applyUpdate(ast, uint8Buffer, _ref) {
+  var _ref2 = _slicedToArray(_ref, 2),
+      oldNode = _ref2[0],
+      newNode = _ref2[1];
+
+  var deltaElements = 0;
+  (0, _ast.assertHasLoc)(oldNode);
+  var sectionName = (0, _helperWasmBytecode.getSectionForNode)(newNode);
+  var replacementByteArray = (0, _wasmGen.encodeNode)(newNode);
+  /**
+   * Replace new node as bytes
+   */
+
+  uint8Buffer = (0, _helperBuffer.overrideBytesInBuffer)(uint8Buffer, // $FlowIgnore: assertHasLoc ensures that
+  oldNode.loc.start.column, // $FlowIgnore: assertHasLoc ensures that
+  oldNode.loc.end.column, replacementByteArray);
+  /**
+   * Update function body size if needed
+   */
+
+  if (sectionName === "code") {
+    // Find the parent func
+    (0, _ast.traverse)(ast, {
+      Func: function Func(_ref3) {
+        var node = _ref3.node;
+        var funcHasThisIntr = node.body.find(function (n) {
+          return n === newNode;
+        }) !== undefined; // Update func's body size if needed
+
+        if (funcHasThisIntr === true) {
+          // These are the old functions locations informations
+          (0, _ast.assertHasLoc)(node);
+          var oldNodeSize = (0, _wasmGen.encodeNode)(oldNode).length;
+          var bodySizeDeltaBytes = replacementByteArray.length - oldNodeSize;
+
+          if (bodySizeDeltaBytes !== 0) {
+            var newValue = node.metadata.bodySize + bodySizeDeltaBytes;
+            var newByteArray = (0, _encoder.encodeU32)(newValue); // function body size byte
+            // FIXME(sven): only handles one byte u32
+
+            var start = node.loc.start.column;
+            var end = start + 1;
+            uint8Buffer = (0, _helperBuffer.overrideBytesInBuffer)(uint8Buffer, start, end, newByteArray);
+          }
+        }
+      }
+    });
+  }
+  /**
+   * Update section size
+   */
+
+
+  var deltaBytes = replacementByteArray.length - (oldNode.loc.end.column - oldNode.loc.start.column); // Init location informations
+
+  newNode.loc = {
+    start: {
+      line: -1,
+      column: -1
+    },
+    end: {
+      line: -1,
+      column: -1
+    }
+  }; // Update new node end position
+  // $FlowIgnore: assertHasLoc ensures that
+
+  newNode.loc.start.column = oldNode.loc.start.column; // $FlowIgnore: assertHasLoc ensures that
+
+  newNode.loc.end.column = // $FlowIgnore: assertHasLoc ensures that
+  oldNode.loc.start.column + replacementByteArray.length;
+  return {
+    uint8Buffer: uint8Buffer,
+    deltaBytes: deltaBytes,
+    deltaElements: deltaElements
+  };
+}
+
+function applyDelete(ast, uint8Buffer, node) {
+  var deltaElements = -1; // since we removed an element
+
+  (0, _ast.assertHasLoc)(node);
+  var sectionName = (0, _helperWasmBytecode.getSectionForNode)(node);
+
+  if (sectionName === "start") {
+    var sectionMetadata = (0, _ast.getSectionMetadata)(ast, "start");
+    /**
+     * The start section only contains one element,
+     * we need to remove the whole section
+     */
+
+    uint8Buffer = (0, _helperWasmSection.removeSections)(ast, uint8Buffer, "start");
+
+    var _deltaBytes = -(sectionMetadata.size.value + 1);
+    /* section id */
+
+
+    return {
+      uint8Buffer: uint8Buffer,
+      deltaBytes: _deltaBytes,
+      deltaElements: deltaElements
+    };
+  } // replacement is nothing
+
+
+  var replacement = [];
+  uint8Buffer = (0, _helperBuffer.overrideBytesInBuffer)(uint8Buffer, // $FlowIgnore: assertHasLoc ensures that
+  node.loc.start.column, // $FlowIgnore: assertHasLoc ensures that
+  node.loc.end.column, replacement);
+  /**
+   * Update section
+   */
+  // $FlowIgnore: assertHasLoc ensures that
+
+  var deltaBytes = -(node.loc.end.column - node.loc.start.column);
+  return {
+    uint8Buffer: uint8Buffer,
+    deltaBytes: deltaBytes,
+    deltaElements: deltaElements
+  };
+}
+
+function applyAdd(ast, uint8Buffer, node) {
+  var deltaElements = +1; // since we added an element
+
+  var sectionName = (0, _helperWasmBytecode.getSectionForNode)(node);
+  var sectionMetadata = (0, _ast.getSectionMetadata)(ast, sectionName); // Section doesn't exists, we create an empty one
+
+  if (typeof sectionMetadata === "undefined") {
+    var res = (0, _helperWasmSection.createEmptySection)(ast, uint8Buffer, sectionName);
+    uint8Buffer = res.uint8Buffer;
+    sectionMetadata = res.sectionMetadata;
+  }
+  /**
+   * check that the expressions were ended
+   */
+
+
+  if ((0, _ast.isFunc)(node)) {
+    // $FlowIgnore
+    var body = node.body;
+
+    if (body.length === 0 || body[body.length - 1].id !== "end") {
+      throw new Error("expressions must be ended");
+    }
+  }
+
+  if ((0, _ast.isGlobal)(node)) {
+    // $FlowIgnore
+    var body = node.init;
+
+    if (body.length === 0 || body[body.length - 1].id !== "end") {
+      throw new Error("expressions must be ended");
+    }
+  }
+  /**
+   * Add nodes
+   */
+
+
+  var newByteArray = (0, _wasmGen.encodeNode)(node); // The size of the section doesn't include the storage of the size itself
+  // we need to manually add it here
+
+  var start = (0, _ast.getEndOfSection)(sectionMetadata);
+  var end = start;
+  /**
+   * Update section
+   */
+
+  var deltaBytes = newByteArray.length;
+  uint8Buffer = (0, _helperBuffer.overrideBytesInBuffer)(uint8Buffer, start, end, newByteArray);
+  node.loc = {
+    start: {
+      line: -1,
+      column: start
+    },
+    end: {
+      line: -1,
+      column: start + deltaBytes
+    }
+  }; // for func add the additional metadata in the AST
+
+  if (node.type === "Func") {
+    // the size is the first byte
+    // FIXME(sven): handle LEB128 correctly here
+    var bodySize = newByteArray[0];
+    node.metadata = {
+      bodySize: bodySize
+    };
+  }
+
+  if (node.type !== "IndexInFuncSection") {
+    (0, _ast.orderedInsertNode)(ast.body[0], node);
+  }
+
+  return {
+    uint8Buffer: uint8Buffer,
+    deltaBytes: deltaBytes,
+    deltaElements: deltaElements
+  };
+}
+
+function applyOperations(ast, uint8Buffer, ops) {
+  ops.forEach(function (op) {
+    var state;
+    var sectionName;
+
+    switch (op.kind) {
+      case "update":
+        state = applyUpdate(ast, uint8Buffer, [op.oldNode, op.node]);
+        sectionName = (0, _helperWasmBytecode.getSectionForNode)(op.node);
+        break;
+
+      case "delete":
+        state = applyDelete(ast, uint8Buffer, op.node);
+        sectionName = (0, _helperWasmBytecode.getSectionForNode)(op.node);
+        break;
+
+      case "add":
+        state = applyAdd(ast, uint8Buffer, op.node);
+        sectionName = (0, _helperWasmBytecode.getSectionForNode)(op.node);
+        break;
+
+      default:
+        throw new Error("Unknown operation");
+    }
+    /**
+     * Resize section vec size.
+     * If the length of the LEB-encoded size changes, this can change
+     * the byte length of the section and the offset for nodes in the
+     * section. So we do this first before resizing section byte size
+     * or shifting following operations' nodes.
+     */
+
+
+    if (state.deltaElements !== 0 && sectionName !== "start") {
+      var oldBufferLength = state.uint8Buffer.length;
+      state.uint8Buffer = (0, _helperWasmSection.resizeSectionVecSize)(ast, state.uint8Buffer, sectionName, state.deltaElements); // Infer bytes added/removed by comparing buffer lengths
+
+      state.deltaBytes += state.uint8Buffer.length - oldBufferLength;
+    }
+    /**
+     * Resize section byte size.
+     * If the length of the LEB-encoded size changes, this can change
+     * the offset for nodes in the section. So we do this before
+     * shifting following operations' nodes.
+     */
+
+
+    if (state.deltaBytes !== 0 && sectionName !== "start") {
+      var _oldBufferLength = state.uint8Buffer.length;
+      state.uint8Buffer = (0, _helperWasmSection.resizeSectionByteSize)(ast, state.uint8Buffer, sectionName, state.deltaBytes); // Infer bytes added/removed by comparing buffer lengths
+
+      state.deltaBytes += state.uint8Buffer.length - _oldBufferLength;
+    }
+    /**
+     * Shift following operation's nodes
+     */
+
+
+    if (state.deltaBytes !== 0) {
+      ops.forEach(function (op) {
+        // We don't need to handle add ops, they are positioning independent
+        switch (op.kind) {
+          case "update":
+            shiftLocNodeByDelta(op.oldNode, state.deltaBytes);
+            break;
+
+          case "delete":
+            shiftLocNodeByDelta(op.node, state.deltaBytes);
+            break;
+        }
+      });
+    }
+
+    uint8Buffer = state.uint8Buffer;
+  });
+  return uint8Buffer;
+}

backend/frontend/node_modules/@webassemblyjs/wasm-edit/lib/index.js

@@ -0,0 +1,134 @@
+"use strict";
+
+function _typeof(obj) { "@babel/helpers - typeof"; if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.edit = edit;
+exports.editWithAST = editWithAST;
+exports.add = add;
+exports.addWithAST = addWithAST;
+
+var _wasmParser = require("@webassemblyjs/wasm-parser");
+
+var _ast = require("@webassemblyjs/ast");
+
+var _clone = require("@webassemblyjs/ast/lib/clone");
+
+var _wasmOpt = require("@webassemblyjs/wasm-opt");
+
+var _helperWasmBytecode = _interopRequireWildcard(require("@webassemblyjs/helper-wasm-bytecode"));
+
+var _apply = require("./apply");
+
+function _getRequireWildcardCache(nodeInterop) { if (typeof WeakMap !== "function") return null; var cacheBabelInterop = new WeakMap(); var cacheNodeInterop = new WeakMap(); return (_getRequireWildcardCache = function _getRequireWildcardCache(nodeInterop) { return nodeInterop ? cacheNodeInterop : cacheBabelInterop; })(nodeInterop); }
+
+function _interopRequireWildcard(obj, nodeInterop) { if (!nodeInterop && obj && obj.__esModule) { return obj; } if (obj === null || _typeof(obj) !== "object" && typeof obj !== "function") { return { "default": obj }; } var cache = _getRequireWildcardCache(nodeInterop); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (key !== "default" && Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj["default"] = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
+
+function _createForOfIteratorHelper(o, allowArrayLike) { var it = typeof Symbol !== "undefined" && o[Symbol.iterator] || o["@@iterator"]; if (!it) { if (Array.isArray(o) || (it = _unsupportedIterableToArray(o)) || allowArrayLike && o && typeof o.length === "number") { if (it) o = it; var i = 0; var F = function F() {}; return { s: F, n: function n() { if (i >= o.length) return { done: true }; return { done: false, value: o[i++] }; }, e: function e(_e) { throw _e; }, f: F }; } throw new TypeError("Invalid attempt to iterate non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); } var normalCompletion = true, didErr = false, err; return { s: function s() { it = it.call(o); }, n: function n() { var step = it.next(); normalCompletion = step.done; return step; }, e: function e(_e2) { didErr = true; err = _e2; }, f: function f() { try { if (!normalCompletion && it["return"] != null) it["return"](); } finally { if (didErr) throw err; } } }; }
+
+function _unsupportedIterableToArray(o, minLen) { if (!o) return; if (typeof o === "string") return _arrayLikeToArray(o, minLen); var n = Object.prototype.toString.call(o).slice(8, -1); if (n === "Object" && o.constructor) n = o.constructor.name; if (n === "Map" || n === "Set") return Array.from(o); if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen); }
+
+function _arrayLikeToArray(arr, len) { if (len == null || len > arr.length) len = arr.length; for (var i = 0, arr2 = new Array(len); i < len; i++) { arr2[i] = arr[i]; } return arr2; }
+
+function hashNode(node) {
+  return JSON.stringify(node);
+}
+
+function preprocess(ab) {
+  var optBin = (0, _wasmOpt.shrinkPaddedLEB128)(new Uint8Array(ab));
+  return optBin.buffer;
+}
+
+function sortBySectionOrder(nodes) {
+  var originalOrder = new Map();
+
+  var _iterator = _createForOfIteratorHelper(nodes),
+      _step;
+
+  try {
+    for (_iterator.s(); !(_step = _iterator.n()).done;) {
+      var node = _step.value;
+      originalOrder.set(node, originalOrder.size);
+    }
+  } catch (err) {
+    _iterator.e(err);
+  } finally {
+    _iterator.f();
+  }
+
+  nodes.sort(function (a, b) {
+    var sectionA = (0, _helperWasmBytecode.getSectionForNode)(a);
+    var sectionB = (0, _helperWasmBytecode.getSectionForNode)(b);
+    var aId = _helperWasmBytecode["default"].sections[sectionA];
+    var bId = _helperWasmBytecode["default"].sections[sectionB];
+
+    if (typeof aId !== "number" || typeof bId !== "number") {
+      throw new Error("Section id not found");
+    }
+
+    if (aId === bId) {
+      // $FlowIgnore originalOrder is filled for all nodes
+      return originalOrder.get(a) - originalOrder.get(b);
+    }
+
+    return aId - bId;
+  });
+}
+
+function edit(ab, visitors) {
+  ab = preprocess(ab);
+  var ast = (0, _wasmParser.decode)(ab);
+  return editWithAST(ast, ab, visitors);
+}
+
+function editWithAST(ast, ab, visitors) {
+  var operations = [];
+  var uint8Buffer = new Uint8Array(ab);
+  var nodeBefore;
+
+  function before(type, path) {
+    nodeBefore = (0, _clone.cloneNode)(path.node);
+  }
+
+  function after(type, path) {
+    if (path.node._deleted === true) {
+      operations.push({
+        kind: "delete",
+        node: path.node
+      }); // $FlowIgnore
+    } else if (hashNode(nodeBefore) !== hashNode(path.node)) {
+      operations.push({
+        kind: "update",
+        oldNode: nodeBefore,
+        node: path.node
+      });
+    }
+  }
+
+  (0, _ast.traverse)(ast, visitors, before, after);
+  uint8Buffer = (0, _apply.applyOperations)(ast, uint8Buffer, operations);
+  return uint8Buffer.buffer;
+}
+
+function add(ab, newNodes) {
+  ab = preprocess(ab);
+  var ast = (0, _wasmParser.decode)(ab);
+  return addWithAST(ast, ab, newNodes);
+}
+
+function addWithAST(ast, ab, newNodes) {
+  // Sort nodes by insertion order
+  sortBySectionOrder(newNodes);
+  var uint8Buffer = new Uint8Array(ab); // Map node into operations
+
+  var operations = newNodes.map(function (n) {
+    return {
+      kind: "add",
+      node: n
+    };
+  });
+  uint8Buffer = (0, _apply.applyOperations)(ast, uint8Buffer, operations);
+  return uint8Buffer.buffer;
+}

backend/frontend/node_modules/@webassemblyjs/wasm-gen/lib/encoder/index.js

@@ -0,0 +1,372 @@
+"use strict";
+
+function _typeof(obj) { "@babel/helpers - typeof"; if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.encodeVersion = encodeVersion;
+exports.encodeHeader = encodeHeader;
+exports.encodeU32 = encodeU32;
+exports.encodeI32 = encodeI32;
+exports.encodeI64 = encodeI64;
+exports.encodeVec = encodeVec;
+exports.encodeValtype = encodeValtype;
+exports.encodeMutability = encodeMutability;
+exports.encodeUTF8Vec = encodeUTF8Vec;
+exports.encodeLimits = encodeLimits;
+exports.encodeModuleImport = encodeModuleImport;
+exports.encodeSectionMetadata = encodeSectionMetadata;
+exports.encodeCallInstruction = encodeCallInstruction;
+exports.encodeCallIndirectInstruction = encodeCallIndirectInstruction;
+exports.encodeModuleExport = encodeModuleExport;
+exports.encodeTypeInstruction = encodeTypeInstruction;
+exports.encodeInstr = encodeInstr;
+exports.encodeStringLiteral = encodeStringLiteral;
+exports.encodeGlobal = encodeGlobal;
+exports.encodeFuncBody = encodeFuncBody;
+exports.encodeIndexInFuncSection = encodeIndexInFuncSection;
+exports.encodeElem = encodeElem;
+
+var leb = _interopRequireWildcard(require("@webassemblyjs/leb128"));
+
+var ieee754 = _interopRequireWildcard(require("@webassemblyjs/ieee754"));
+
+var utf8 = _interopRequireWildcard(require("@webassemblyjs/utf8"));
+
+var _helperWasmBytecode = _interopRequireDefault(require("@webassemblyjs/helper-wasm-bytecode"));
+
+var _index = require("../index");
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { "default": obj }; }
+
+function _getRequireWildcardCache(nodeInterop) { if (typeof WeakMap !== "function") return null; var cacheBabelInterop = new WeakMap(); var cacheNodeInterop = new WeakMap(); return (_getRequireWildcardCache = function _getRequireWildcardCache(nodeInterop) { return nodeInterop ? cacheNodeInterop : cacheBabelInterop; })(nodeInterop); }
+
+function _interopRequireWildcard(obj, nodeInterop) { if (!nodeInterop && obj && obj.__esModule) { return obj; } if (obj === null || _typeof(obj) !== "object" && typeof obj !== "function") { return { "default": obj }; } var cache = _getRequireWildcardCache(nodeInterop); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (key !== "default" && Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj["default"] = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
+
+function _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _unsupportedIterableToArray(arr) || _nonIterableSpread(); }
+
+function _nonIterableSpread() { throw new TypeError("Invalid attempt to spread non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); }
+
+function _unsupportedIterableToArray(o, minLen) { if (!o) return; if (typeof o === "string") return _arrayLikeToArray(o, minLen); var n = Object.prototype.toString.call(o).slice(8, -1); if (n === "Object" && o.constructor) n = o.constructor.name; if (n === "Map" || n === "Set") return Array.from(o); if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen); }
+
+function _iterableToArray(iter) { if (typeof Symbol !== "undefined" && iter[Symbol.iterator] != null || iter["@@iterator"] != null) return Array.from(iter); }
+
+function _arrayWithoutHoles(arr) { if (Array.isArray(arr)) return _arrayLikeToArray(arr); }
+
+function _arrayLikeToArray(arr, len) { if (len == null || len > arr.length) len = arr.length; for (var i = 0, arr2 = new Array(len); i < len; i++) { arr2[i] = arr[i]; } return arr2; }
+
+function assertNotIdentifierNode(n) {
+  if (n.type === "Identifier") {
+    throw new Error("Unsupported node Identifier");
+  }
+}
+
+function encodeVersion(v) {
+  var bytes = _helperWasmBytecode["default"].moduleVersion;
+  bytes[0] = v;
+  return bytes;
+}
+
+function encodeHeader() {
+  return _helperWasmBytecode["default"].magicModuleHeader;
+}
+
+function encodeU32(v) {
+  var uint8view = new Uint8Array(leb.encodeU32(v));
+
+  var array = _toConsumableArray(uint8view);
+
+  return array;
+}
+
+function encodeI32(v) {
+  var uint8view = new Uint8Array(leb.encodeI32(v));
+
+  var array = _toConsumableArray(uint8view);
+
+  return array;
+}
+
+function encodeI64(v) {
+  var uint8view = new Uint8Array(leb.encodeI64(v));
+
+  var array = _toConsumableArray(uint8view);
+
+  return array;
+}
+
+function encodeVec(elements) {
+  var size = encodeU32(elements.length);
+  return [].concat(_toConsumableArray(size), _toConsumableArray(elements));
+}
+
+function encodeValtype(v) {
+  var _byte = _helperWasmBytecode["default"].valtypesByString[v];
+
+  if (typeof _byte === "undefined") {
+    throw new Error("Unknown valtype: " + v);
+  }
+
+  return parseInt(_byte, 10);
+}
+
+function encodeMutability(v) {
+  var _byte2 = _helperWasmBytecode["default"].globalTypesByString[v];
+
+  if (typeof _byte2 === "undefined") {
+    throw new Error("Unknown mutability: " + v);
+  }
+
+  return parseInt(_byte2, 10);
+}
+
+function encodeUTF8Vec(str) {
+  return encodeVec(utf8.encode(str));
+}
+
+function encodeLimits(n) {
+  var out = [];
+
+  if (typeof n.max === "number") {
+    out.push(0x01);
+    out.push.apply(out, _toConsumableArray(encodeU32(n.min))); // $FlowIgnore: ensured by the typeof
+
+    out.push.apply(out, _toConsumableArray(encodeU32(n.max)));
+  } else {
+    out.push(0x00);
+    out.push.apply(out, _toConsumableArray(encodeU32(n.min)));
+  }
+
+  return out;
+}
+
+function encodeModuleImport(n) {
+  var out = [];
+  out.push.apply(out, _toConsumableArray(encodeUTF8Vec(n.module)));
+  out.push.apply(out, _toConsumableArray(encodeUTF8Vec(n.name)));
+
+  switch (n.descr.type) {
+    case "GlobalType":
+      {
+        out.push(0x03); // $FlowIgnore: GlobalType ensure that these props exists
+
+        out.push(encodeValtype(n.descr.valtype)); // $FlowIgnore: GlobalType ensure that these props exists
+
+        out.push(encodeMutability(n.descr.mutability));
+        break;
+      }
+
+    case "Memory":
+      {
+        out.push(0x02); // $FlowIgnore
+
+        out.push.apply(out, _toConsumableArray(encodeLimits(n.descr.limits)));
+        break;
+      }
+
+    case "Table":
+      {
+        out.push(0x01);
+        out.push(0x70); // element type
+        // $FlowIgnore
+
+        out.push.apply(out, _toConsumableArray(encodeLimits(n.descr.limits)));
+        break;
+      }
+
+    case "FuncImportDescr":
+      {
+        out.push(0x00); // $FlowIgnore
+
+        assertNotIdentifierNode(n.descr.id); // $FlowIgnore
+
+        out.push.apply(out, _toConsumableArray(encodeU32(n.descr.id.value)));
+        break;
+      }
+
+    default:
+      throw new Error("Unsupport operation: encode module import of type: " + n.descr.type);
+  }
+
+  return out;
+}
+
+function encodeSectionMetadata(n) {
+  var out = [];
+  var sectionId = _helperWasmBytecode["default"].sections[n.section];
+
+  if (typeof sectionId === "undefined") {
+    throw new Error("Unknown section: " + n.section);
+  }
+
+  if (n.section === "start") {
+    /**
+     * This is not implemented yet because it's a special case which
+     * doesn't have a vector in its section.
+     */
+    throw new Error("Unsupported section encoding of type start");
+  }
+
+  out.push(sectionId);
+  out.push.apply(out, _toConsumableArray(encodeU32(n.size.value)));
+  out.push.apply(out, _toConsumableArray(encodeU32(n.vectorOfSize.value)));
+  return out;
+}
+
+function encodeCallInstruction(n) {
+  var out = [];
+  assertNotIdentifierNode(n.index);
+  out.push(0x10); // $FlowIgnore
+
+  out.push.apply(out, _toConsumableArray(encodeU32(n.index.value)));
+  return out;
+}
+
+function encodeCallIndirectInstruction(n) {
+  var out = []; // $FlowIgnore
+
+  assertNotIdentifierNode(n.index);
+  out.push(0x11); // $FlowIgnore
+
+  out.push.apply(out, _toConsumableArray(encodeU32(n.index.value))); // add a reserved byte
+
+  out.push(0x00);
+  return out;
+}
+
+function encodeModuleExport(n) {
+  var out = [];
+  assertNotIdentifierNode(n.descr.id);
+  var exportTypeByteString = _helperWasmBytecode["default"].exportTypesByName[n.descr.exportType];
+
+  if (typeof exportTypeByteString === "undefined") {
+    throw new Error("Unknown export of type: " + n.descr.exportType);
+  }
+
+  var exportTypeByte = parseInt(exportTypeByteString, 10);
+  out.push.apply(out, _toConsumableArray(encodeUTF8Vec(n.name)));
+  out.push(exportTypeByte); // $FlowIgnore
+
+  out.push.apply(out, _toConsumableArray(encodeU32(n.descr.id.value)));
+  return out;
+}
+
+function encodeTypeInstruction(n) {
+  var out = [0x60];
+  var params = n.functype.params.map(function (x) {
+    return x.valtype;
+  }).map(encodeValtype);
+  var results = n.functype.results.map(encodeValtype);
+  out.push.apply(out, _toConsumableArray(encodeVec(params)));
+  out.push.apply(out, _toConsumableArray(encodeVec(results)));
+  return out;
+}
+
+function encodeInstr(n) {
+  var out = [];
+  var instructionName = n.id;
+
+  if (typeof n.object === "string") {
+    instructionName = "".concat(n.object, ".").concat(String(n.id));
+  }
+
+  var byteString = _helperWasmBytecode["default"].symbolsByName[instructionName];
+
+  if (typeof byteString === "undefined") {
+    throw new Error("encodeInstr: unknown instruction " + JSON.stringify(instructionName));
+  }
+
+  var _byte3 = parseInt(byteString, 10);
+
+  out.push(_byte3);
+
+  if (n.args) {
+    n.args.forEach(function (arg) {
+      var encoder = encodeU32; // find correct encoder
+
+      if (n.object === "i32") {
+        encoder = encodeI32;
+      }
+
+      if (n.object === "i64") {
+        encoder = encodeI64;
+      }
+
+      if (n.object === "f32") {
+        encoder = ieee754.encodeF32;
+      }
+
+      if (n.object === "f64") {
+        encoder = ieee754.encodeF64;
+      }
+
+      if (arg.type === "NumberLiteral" || arg.type === "FloatLiteral" || arg.type === "LongNumberLiteral") {
+        // $FlowIgnore
+        out.push.apply(out, _toConsumableArray(encoder(arg.value)));
+      } else {
+        throw new Error("Unsupported instruction argument encoding " + JSON.stringify(arg.type));
+      }
+    });
+  }
+
+  return out;
+}
+
+function encodeExpr(instrs) {
+  var out = [];
+  instrs.forEach(function (instr) {
+    // $FlowIgnore
+    var n = (0, _index.encodeNode)(instr);
+    out.push.apply(out, _toConsumableArray(n));
+  });
+  return out;
+}
+
+function encodeStringLiteral(n) {
+  return encodeUTF8Vec(n.value);
+}
+
+function encodeGlobal(n) {
+  var out = [];
+  var _n$globalType = n.globalType,
+      valtype = _n$globalType.valtype,
+      mutability = _n$globalType.mutability;
+  out.push(encodeValtype(valtype));
+  out.push(encodeMutability(mutability));
+  out.push.apply(out, _toConsumableArray(encodeExpr(n.init)));
+  return out;
+}
+
+function encodeFuncBody(n) {
+  var out = [];
+  out.push(-1); // temporary function body size
+  // FIXME(sven): get the func locals?
+
+  var localBytes = encodeVec([]);
+  out.push.apply(out, _toConsumableArray(localBytes));
+  var funcBodyBytes = encodeExpr(n.body);
+  out[0] = funcBodyBytes.length + localBytes.length;
+  out.push.apply(out, _toConsumableArray(funcBodyBytes));
+  return out;
+}
+
+function encodeIndexInFuncSection(n) {
+  assertNotIdentifierNode(n.index); // $FlowIgnore
+
+  return encodeU32(n.index.value);
+}
+
+function encodeElem(n) {
+  var out = [];
+  assertNotIdentifierNode(n.table); // $FlowIgnore
+
+  out.push.apply(out, _toConsumableArray(encodeU32(n.table.value)));
+  out.push.apply(out, _toConsumableArray(encodeExpr(n.offset))); // $FlowIgnore
+
+  var funcs = n.funcs.reduce(function (acc, x) {
+    return [].concat(_toConsumableArray(acc), _toConsumableArray(encodeU32(x.value)));
+  }, []);
+  out.push.apply(out, _toConsumableArray(encodeVec(funcs)));
+  return out;
+}

backend/frontend/node_modules/@webassemblyjs/wasm-gen/lib/index.js

@@ -0,0 +1,68 @@
+"use strict";
+
+function _typeof(obj) { "@babel/helpers - typeof"; if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.encodeNode = encodeNode;
+exports.encodeU32 = void 0;
+
+var encoder = _interopRequireWildcard(require("./encoder"));
+
+function _getRequireWildcardCache(nodeInterop) { if (typeof WeakMap !== "function") return null; var cacheBabelInterop = new WeakMap(); var cacheNodeInterop = new WeakMap(); return (_getRequireWildcardCache = function _getRequireWildcardCache(nodeInterop) { return nodeInterop ? cacheNodeInterop : cacheBabelInterop; })(nodeInterop); }
+
+function _interopRequireWildcard(obj, nodeInterop) { if (!nodeInterop && obj && obj.__esModule) { return obj; } if (obj === null || _typeof(obj) !== "object" && typeof obj !== "function") { return { "default": obj }; } var cache = _getRequireWildcardCache(nodeInterop); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (key !== "default" && Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj["default"] = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
+
+function encodeNode(n) {
+  switch (n.type) {
+    case "ModuleImport":
+      // $FlowIgnore: ModuleImport ensure that the node is well formated
+      return encoder.encodeModuleImport(n);
+
+    case "SectionMetadata":
+      // $FlowIgnore: SectionMetadata ensure that the node is well formated
+      return encoder.encodeSectionMetadata(n);
+
+    case "CallInstruction":
+      // $FlowIgnore: SectionMetadata ensure that the node is well formated
+      return encoder.encodeCallInstruction(n);
+
+    case "CallIndirectInstruction":
+      // $FlowIgnore: SectionMetadata ensure that the node is well formated
+      return encoder.encodeCallIndirectInstruction(n);
+
+    case "TypeInstruction":
+      return encoder.encodeTypeInstruction(n);
+
+    case "Instr":
+      // $FlowIgnore
+      return encoder.encodeInstr(n);
+
+    case "ModuleExport":
+      // $FlowIgnore: SectionMetadata ensure that the node is well formated
+      return encoder.encodeModuleExport(n);
+
+    case "Global":
+      // $FlowIgnore
+      return encoder.encodeGlobal(n);
+
+    case "Func":
+      return encoder.encodeFuncBody(n);
+
+    case "IndexInFuncSection":
+      return encoder.encodeIndexInFuncSection(n);
+
+    case "StringLiteral":
+      return encoder.encodeStringLiteral(n);
+
+    case "Elem":
+      return encoder.encodeElem(n);
+
+    default:
+      throw new Error("Unsupported encoding for node of type: " + JSON.stringify(n.type));
+  }
+}
+
+var encodeU32 = encoder.encodeU32;
+exports.encodeU32 = encodeU32;

backend/frontend/node_modules/@webassemblyjs/wasm-opt/lib/index.js

@@ -0,0 +1,66 @@
+"use strict";
+
+function _typeof(obj) { "@babel/helpers - typeof"; if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.shrinkPaddedLEB128 = shrinkPaddedLEB128;
+
+var _wasmParser = require("@webassemblyjs/wasm-parser");
+
+var _leb = require("./leb128.js");
+
+function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
+
+function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }
+
+function _createSuper(Derived) { var hasNativeReflectConstruct = _isNativeReflectConstruct(); return function _createSuperInternal() { var Super = _getPrototypeOf(Derived), result; if (hasNativeReflectConstruct) { var NewTarget = _getPrototypeOf(this).constructor; result = Reflect.construct(Super, arguments, NewTarget); } else { result = Super.apply(this, arguments); } return _possibleConstructorReturn(this, result); }; }
+
+function _possibleConstructorReturn(self, call) { if (call && (_typeof(call) === "object" || typeof call === "function")) { return call; } else if (call !== void 0) { throw new TypeError("Derived constructors may only return object or undefined"); } return _assertThisInitialized(self); }
+
+function _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return self; }
+
+function _wrapNativeSuper(Class) { var _cache = typeof Map === "function" ? new Map() : undefined; _wrapNativeSuper = function _wrapNativeSuper(Class) { if (Class === null || !_isNativeFunction(Class)) return Class; if (typeof Class !== "function") { throw new TypeError("Super expression must either be null or a function"); } if (typeof _cache !== "undefined") { if (_cache.has(Class)) return _cache.get(Class); _cache.set(Class, Wrapper); } function Wrapper() { return _construct(Class, arguments, _getPrototypeOf(this).constructor); } Wrapper.prototype = Object.create(Class.prototype, { constructor: { value: Wrapper, enumerable: false, writable: true, configurable: true } }); return _setPrototypeOf(Wrapper, Class); }; return _wrapNativeSuper(Class); }
+
+function _construct(Parent, args, Class) { if (_isNativeReflectConstruct()) { _construct = Reflect.construct; } else { _construct = function _construct(Parent, args, Class) { var a = [null]; a.push.apply(a, args); var Constructor = Function.bind.apply(Parent, a); var instance = new Constructor(); if (Class) _setPrototypeOf(instance, Class.prototype); return instance; }; } return _construct.apply(null, arguments); }
+
+function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct) return false; if (Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { Boolean.prototype.valueOf.call(Reflect.construct(Boolean, [], function () {})); return true; } catch (e) { return false; } }
+
+function _isNativeFunction(fn) { return Function.toString.call(fn).indexOf("[native code]") !== -1; }
+
+function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+
+function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }
+
+var OptimizerError = /*#__PURE__*/function (_Error) {
+  _inherits(OptimizerError, _Error);
+
+  var _super = _createSuper(OptimizerError);
+
+  function OptimizerError(name, initalError) {
+    var _this;
+
+    _classCallCheck(this, OptimizerError);
+
+    _this = _super.call(this, "Error while optimizing: " + name + ": " + initalError.message);
+    _this.stack = initalError.stack;
+    return _this;
+  }
+
+  return OptimizerError;
+}( /*#__PURE__*/_wrapNativeSuper(Error));
+
+var decoderOpts = {
+  ignoreCodeSection: true,
+  ignoreDataSection: true
+};
+
+function shrinkPaddedLEB128(uint8Buffer) {
+  try {
+    var ast = (0, _wasmParser.decode)(uint8Buffer.buffer, decoderOpts);
+    return (0, _leb.shrinkPaddedLEB128)(ast, uint8Buffer);
+  } catch (e) {
+    throw new OptimizerError("shrinkPaddedLEB128", e);
+  }
+}

backend/frontend/node_modules/@webassemblyjs/wasm-opt/lib/leb128.js

@@ -0,0 +1,56 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.shrinkPaddedLEB128 = shrinkPaddedLEB128;
+
+var _ast = require("@webassemblyjs/ast");
+
+var _encoder = require("@webassemblyjs/wasm-gen/lib/encoder");
+
+var _helperBuffer = require("@webassemblyjs/helper-buffer");
+
+function shiftFollowingSections(ast, _ref, deltaInSizeEncoding) {
+  var section = _ref.section;
+  // Once we hit our section every that is after needs to be shifted by the delta
+  var encounteredSection = false;
+  (0, _ast.traverse)(ast, {
+    SectionMetadata: function SectionMetadata(path) {
+      if (path.node.section === section) {
+        encounteredSection = true;
+        return;
+      }
+
+      if (encounteredSection === true) {
+        (0, _ast.shiftSection)(ast, path.node, deltaInSizeEncoding);
+      }
+    }
+  });
+}
+
+function shrinkPaddedLEB128(ast, uint8Buffer) {
+  (0, _ast.traverse)(ast, {
+    SectionMetadata: function SectionMetadata(_ref2) {
+      var node = _ref2.node;
+
+      /**
+       * Section size
+       */
+      {
+        var newu32Encoded = (0, _encoder.encodeU32)(node.size.value);
+        var newu32EncodedLen = newu32Encoded.length;
+        var start = node.size.loc.start.column;
+        var end = node.size.loc.end.column;
+        var oldu32EncodedLen = end - start;
+
+        if (newu32EncodedLen !== oldu32EncodedLen) {
+          var deltaInSizeEncoding = oldu32EncodedLen - newu32EncodedLen;
+          uint8Buffer = (0, _helperBuffer.overrideBytesInBuffer)(uint8Buffer, start, end, newu32Encoded);
+          shiftFollowingSections(ast, node, -deltaInSizeEncoding);
+        }
+      }
+    }
+  });
+  return uint8Buffer;
+}

backend/frontend/node_modules/@webassemblyjs/wasm-parser/lib/index.js

@@ -0,0 +1,262 @@
+"use strict";
+
+function _typeof(obj) { "@babel/helpers - typeof"; if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.decode = decode;
+
+var decoder = _interopRequireWildcard(require("./decoder"));
+
+var t = _interopRequireWildcard(require("@webassemblyjs/ast"));
+
+function _getRequireWildcardCache(nodeInterop) { if (typeof WeakMap !== "function") return null; var cacheBabelInterop = new WeakMap(); var cacheNodeInterop = new WeakMap(); return (_getRequireWildcardCache = function _getRequireWildcardCache(nodeInterop) { return nodeInterop ? cacheNodeInterop : cacheBabelInterop; })(nodeInterop); }
+
+function _interopRequireWildcard(obj, nodeInterop) { if (!nodeInterop && obj && obj.__esModule) { return obj; } if (obj === null || _typeof(obj) !== "object" && typeof obj !== "function") { return { "default": obj }; } var cache = _getRequireWildcardCache(nodeInterop); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (key !== "default" && Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj["default"] = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
+
+/**
+ * TODO(sven): I added initial props, but we should rather fix
+ * https://github.com/xtuc/webassemblyjs/issues/405
+ */
+var defaultDecoderOpts = {
+  dump: false,
+  ignoreCodeSection: false,
+  ignoreDataSection: false,
+  ignoreCustomNameSection: false
+}; // traverses the AST, locating function name metadata, which is then
+// used to update index-based identifiers with function names
+
+function restoreFunctionNames(ast) {
+  var functionNames = [];
+  t.traverse(ast, {
+    FunctionNameMetadata: function FunctionNameMetadata(_ref) {
+      var node = _ref.node;
+      functionNames.push({
+        name: node.value,
+        index: node.index
+      });
+    }
+  });
+
+  if (functionNames.length === 0) {
+    return;
+  }
+
+  t.traverse(ast, {
+    Func: function (_Func) {
+      function Func(_x) {
+        return _Func.apply(this, arguments);
+      }
+
+      Func.toString = function () {
+        return _Func.toString();
+      };
+
+      return Func;
+    }(function (_ref2) {
+      var node = _ref2.node;
+      // $FlowIgnore
+      var nodeName = node.name;
+      var indexBasedFunctionName = nodeName.value;
+      var index = Number(indexBasedFunctionName.replace("func_", ""));
+      var functionName = functionNames.find(function (f) {
+        return f.index === index;
+      });
+
+      if (functionName) {
+        var oldValue = nodeName.value;
+        nodeName.value = functionName.name; // $FlowIgnore
+
+        nodeName.numeric = oldValue; // $FlowIgnore
+
+        delete nodeName.raw;
+      }
+    }),
+    // Also update the reference in the export
+    ModuleExport: function (_ModuleExport) {
+      function ModuleExport(_x2) {
+        return _ModuleExport.apply(this, arguments);
+      }
+
+      ModuleExport.toString = function () {
+        return _ModuleExport.toString();
+      };
+
+      return ModuleExport;
+    }(function (_ref3) {
+      var node = _ref3.node;
+
+      if (node.descr.exportType === "Func") {
+        // $FlowIgnore
+        var nodeName = node.descr.id;
+        var index = nodeName.value;
+        var functionName = functionNames.find(function (f) {
+          return f.index === index;
+        });
+
+        if (functionName) {
+          node.descr.id = t.identifier(functionName.name);
+        }
+      }
+    }),
+    ModuleImport: function (_ModuleImport) {
+      function ModuleImport(_x3) {
+        return _ModuleImport.apply(this, arguments);
+      }
+
+      ModuleImport.toString = function () {
+        return _ModuleImport.toString();
+      };
+
+      return ModuleImport;
+    }(function (_ref4) {
+      var node = _ref4.node;
+
+      if (node.descr.type === "FuncImportDescr") {
+        // $FlowIgnore
+        var indexBasedFunctionName = node.descr.id;
+        var index = Number(indexBasedFunctionName.replace("func_", ""));
+        var functionName = functionNames.find(function (f) {
+          return f.index === index;
+        });
+
+        if (functionName) {
+          // $FlowIgnore
+          node.descr.id = t.identifier(functionName.name);
+        }
+      }
+    }),
+    CallInstruction: function (_CallInstruction) {
+      function CallInstruction(_x4) {
+        return _CallInstruction.apply(this, arguments);
+      }
+
+      CallInstruction.toString = function () {
+        return _CallInstruction.toString();
+      };
+
+      return CallInstruction;
+    }(function (nodePath) {
+      var node = nodePath.node;
+      var index = node.index.value;
+      var functionName = functionNames.find(function (f) {
+        return f.index === index;
+      });
+
+      if (functionName) {
+        var oldValue = node.index;
+        node.index = t.identifier(functionName.name);
+        node.numeric = oldValue; // $FlowIgnore
+
+        delete node.raw;
+      }
+    })
+  });
+}
+
+function restoreLocalNames(ast) {
+  var localNames = [];
+  t.traverse(ast, {
+    LocalNameMetadata: function LocalNameMetadata(_ref5) {
+      var node = _ref5.node;
+      localNames.push({
+        name: node.value,
+        localIndex: node.localIndex,
+        functionIndex: node.functionIndex
+      });
+    }
+  });
+
+  if (localNames.length === 0) {
+    return;
+  }
+
+  t.traverse(ast, {
+    Func: function (_Func2) {
+      function Func(_x5) {
+        return _Func2.apply(this, arguments);
+      }
+
+      Func.toString = function () {
+        return _Func2.toString();
+      };
+
+      return Func;
+    }(function (_ref6) {
+      var node = _ref6.node;
+      var signature = node.signature;
+
+      if (signature.type !== "Signature") {
+        return;
+      } // $FlowIgnore
+
+
+      var nodeName = node.name;
+      var indexBasedFunctionName = nodeName.value;
+      var functionIndex = Number(indexBasedFunctionName.replace("func_", ""));
+      signature.params.forEach(function (param, paramIndex) {
+        var paramName = localNames.find(function (f) {
+          return f.localIndex === paramIndex && f.functionIndex === functionIndex;
+        });
+
+        if (paramName && paramName.name !== "") {
+          param.id = paramName.name;
+        }
+      });
+    })
+  });
+}
+
+function restoreModuleName(ast) {
+  t.traverse(ast, {
+    ModuleNameMetadata: function (_ModuleNameMetadata) {
+      function ModuleNameMetadata(_x6) {
+        return _ModuleNameMetadata.apply(this, arguments);
+      }
+
+      ModuleNameMetadata.toString = function () {
+        return _ModuleNameMetadata.toString();
+      };
+
+      return ModuleNameMetadata;
+    }(function (moduleNameMetadataPath) {
+      // update module
+      t.traverse(ast, {
+        Module: function (_Module) {
+          function Module(_x7) {
+            return _Module.apply(this, arguments);
+          }
+
+          Module.toString = function () {
+            return _Module.toString();
+          };
+
+          return Module;
+        }(function (_ref7) {
+          var node = _ref7.node;
+          var name = moduleNameMetadataPath.node.value; // compatiblity with wast-parser
+
+          if (name === "") {
+            name = null;
+          }
+
+          node.id = name;
+        })
+      });
+    })
+  });
+}
+
+function decode(buf, customOpts) {
+  var opts = Object.assign({}, defaultDecoderOpts, customOpts);
+  var ast = decoder.decode(buf, opts);
+
+  if (opts.ignoreCustomNameSection === false) {
+    restoreFunctionNames(ast);
+    restoreLocalNames(ast);
+    restoreModuleName(ast);
+  }
+
+  return ast;
+}

backend/frontend/node_modules/@webassemblyjs/wasm-parser/lib/types/decoder.js

@@ -0,0 +1 @@
+"use strict";

backend/frontend/node_modules/@webassemblyjs/wast-printer/lib/index.js

@@ -0,0 +1,931 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.print = print;
+
+var _ast = require("@webassemblyjs/ast");
+
+var _long = _interopRequireDefault(require("@xtuc/long"));
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { "default": obj }; }
+
+function _typeof(obj) { "@babel/helpers - typeof"; if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }
+
+function _slicedToArray(arr, i) { return _arrayWithHoles(arr) || _iterableToArrayLimit(arr, i) || _unsupportedIterableToArray(arr, i) || _nonIterableRest(); }
+
+function _nonIterableRest() { throw new TypeError("Invalid attempt to destructure non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); }
+
+function _unsupportedIterableToArray(o, minLen) { if (!o) return; if (typeof o === "string") return _arrayLikeToArray(o, minLen); var n = Object.prototype.toString.call(o).slice(8, -1); if (n === "Object" && o.constructor) n = o.constructor.name; if (n === "Map" || n === "Set") return Array.from(o); if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen); }
+
+function _arrayLikeToArray(arr, len) { if (len == null || len > arr.length) len = arr.length; for (var i = 0, arr2 = new Array(len); i < len; i++) { arr2[i] = arr[i]; } return arr2; }
+
+function _iterableToArrayLimit(arr, i) { var _i = arr == null ? null : typeof Symbol !== "undefined" && arr[Symbol.iterator] || arr["@@iterator"]; if (_i == null) return; var _arr = []; var _n = true; var _d = false; var _s, _e; try { for (_i = _i.call(arr); !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i["return"] != null) _i["return"](); } finally { if (_d) throw _e; } } return _arr; }
+
+function _arrayWithHoles(arr) { if (Array.isArray(arr)) return arr; }
+
+var compact = false;
+var space = " ";
+
+var quote = function quote(str) {
+  return "\"".concat(str, "\"");
+};
+
+function indent(nb) {
+  return Array(nb).fill(space + space).join("");
+} // TODO(sven): allow arbitrary ast nodes
+
+
+function print(n) {
+  if (n.type === "Program") {
+    return printProgram(n, 0);
+  } else {
+    throw new Error("Unsupported node in print of type: " + String(n.type));
+  }
+}
+
+function printProgram(n, depth) {
+  return n.body.reduce(function (acc, child) {
+    if (child.type === "Module") {
+      acc += printModule(child, depth + 1);
+    }
+
+    if (child.type === "Func") {
+      acc += printFunc(child, depth + 1);
+    }
+
+    if (child.type === "BlockComment") {
+      acc += printBlockComment(child);
+    }
+
+    if (child.type === "LeadingComment") {
+      acc += printLeadingComment(child);
+    }
+
+    if (compact === false) {
+      acc += "\n";
+    }
+
+    return acc;
+  }, "");
+}
+
+function printTypeInstruction(n) {
+  var out = "";
+  out += "(";
+  out += "type";
+  out += space;
+
+  if (n.id != null) {
+    out += printIndex(n.id);
+    out += space;
+  }
+
+  out += "(";
+  out += "func";
+  n.functype.params.forEach(function (param) {
+    out += space;
+    out += "(";
+    out += "param";
+    out += space;
+    out += printFuncParam(param);
+    out += ")";
+  });
+  n.functype.results.forEach(function (result) {
+    out += space;
+    out += "(";
+    out += "result";
+    out += space;
+    out += result;
+    out += ")";
+  });
+  out += ")"; // func
+
+  out += ")";
+  return out;
+}
+
+function printModule(n, depth) {
+  var out = "(";
+  out += "module";
+
+  if (typeof n.id === "string") {
+    out += space;
+    out += n.id;
+  }
+
+  if (compact === false) {
+    out += "\n";
+  } else {
+    out += space;
+  }
+
+  n.fields.forEach(function (field) {
+    if (compact === false) {
+      out += indent(depth);
+    }
+
+    switch (field.type) {
+      case "Func":
+        {
+          out += printFunc(field, depth + 1);
+          break;
+        }
+
+      case "TypeInstruction":
+        {
+          out += printTypeInstruction(field);
+          break;
+        }
+
+      case "Table":
+        {
+          out += printTable(field);
+          break;
+        }
+
+      case "Global":
+        {
+          out += printGlobal(field, depth + 1);
+          break;
+        }
+
+      case "ModuleExport":
+        {
+          out += printModuleExport(field);
+          break;
+        }
+
+      case "ModuleImport":
+        {
+          out += printModuleImport(field);
+          break;
+        }
+
+      case "Memory":
+        {
+          out += printMemory(field);
+          break;
+        }
+
+      case "BlockComment":
+        {
+          out += printBlockComment(field);
+          break;
+        }
+
+      case "LeadingComment":
+        {
+          out += printLeadingComment(field);
+          break;
+        }
+
+      case "Start":
+        {
+          out += printStart(field);
+          break;
+        }
+
+      case "Elem":
+        {
+          out += printElem(field, depth);
+          break;
+        }
+
+      case "Data":
+        {
+          out += printData(field, depth);
+          break;
+        }
+
+      default:
+        throw new Error("Unsupported node in printModule: " + String(field.type));
+    }
+
+    if (compact === false) {
+      out += "\n";
+    }
+  });
+  out += ")";
+  return out;
+}
+
+function printData(n, depth) {
+  var out = "";
+  out += "(";
+  out += "data";
+  out += space;
+  out += printIndex(n.memoryIndex);
+  out += space;
+  out += printInstruction(n.offset, depth);
+  out += space;
+  out += '"';
+  n.init.values.forEach(function (_byte) {
+    // Avoid non-displayable characters
+    if (_byte <= 31 || _byte == 34 || _byte == 92 || _byte >= 127) {
+      out += "\\";
+      out += ("00" + _byte.toString(16)).substr(-2);
+    } else if (_byte > 255) {
+      throw new Error("Unsupported byte in data segment: " + _byte);
+    } else {
+      out += String.fromCharCode(_byte);
+    }
+  });
+  out += '"';
+  out += ")";
+  return out;
+}
+
+function printElem(n, depth) {
+  var out = "";
+  out += "(";
+  out += "elem";
+  out += space;
+  out += printIndex(n.table);
+
+  var _n$offset = _slicedToArray(n.offset, 1),
+      firstOffset = _n$offset[0];
+
+  out += space;
+  out += "(";
+  out += "offset";
+  out += space;
+  out += printInstruction(firstOffset, depth);
+  out += ")";
+  n.funcs.forEach(function (func) {
+    out += space;
+    out += printIndex(func);
+  });
+  out += ")";
+  return out;
+}
+
+function printStart(n) {
+  var out = "";
+  out += "(";
+  out += "start";
+  out += space;
+  out += printIndex(n.index);
+  out += ")";
+  return out;
+}
+
+function printLeadingComment(n) {
+  // Don't print leading comments in compact mode
+  if (compact === true) {
+    return "";
+  }
+
+  var out = "";
+  out += ";;";
+  out += n.value;
+  out += "\n";
+  return out;
+}
+
+function printBlockComment(n) {
+  // Don't print block comments in compact mode
+  if (compact === true) {
+    return "";
+  }
+
+  var out = "";
+  out += "(;";
+  out += n.value;
+  out += ";)";
+  out += "\n";
+  return out;
+}
+
+function printSignature(n) {
+  var out = "";
+  n.params.forEach(function (param) {
+    out += space;
+    out += "(";
+    out += "param";
+    out += space;
+    out += printFuncParam(param);
+    out += ")";
+  });
+  n.results.forEach(function (result) {
+    out += space;
+    out += "(";
+    out += "result";
+    out += space;
+    out += result;
+    out += ")";
+  });
+  return out;
+}
+
+function printModuleImportDescr(n) {
+  var out = "";
+
+  if (n.type === "FuncImportDescr") {
+    out += "(";
+    out += "func";
+
+    if ((0, _ast.isAnonymous)(n.id) === false) {
+      out += space;
+      out += printIdentifier(n.id);
+    }
+
+    out += printSignature(n.signature);
+    out += ")";
+  }
+
+  if (n.type === "GlobalType") {
+    out += "(";
+    out += "global";
+    out += space;
+    out += printGlobalType(n);
+    out += ")";
+  }
+
+  if (n.type === "Table") {
+    out += printTable(n);
+  }
+
+  return out;
+}
+
+function printModuleImport(n) {
+  var out = "";
+  out += "(";
+  out += "import";
+  out += space;
+  out += quote(n.module);
+  out += space;
+  out += quote(n.name);
+  out += space;
+  out += printModuleImportDescr(n.descr);
+  out += ")";
+  return out;
+}
+
+function printGlobalType(n) {
+  var out = "";
+
+  if (n.mutability === "var") {
+    out += "(";
+    out += "mut";
+    out += space;
+    out += n.valtype;
+    out += ")";
+  } else {
+    out += n.valtype;
+  }
+
+  return out;
+}
+
+function printGlobal(n, depth) {
+  var out = "";
+  out += "(";
+  out += "global";
+  out += space;
+
+  if (n.name != null && (0, _ast.isAnonymous)(n.name) === false) {
+    out += printIdentifier(n.name);
+    out += space;
+  }
+
+  out += printGlobalType(n.globalType);
+  out += space;
+  n.init.forEach(function (i) {
+    out += printInstruction(i, depth + 1);
+  });
+  out += ")";
+  return out;
+}
+
+function printTable(n) {
+  var out = "";
+  out += "(";
+  out += "table";
+  out += space;
+
+  if (n.name != null && (0, _ast.isAnonymous)(n.name) === false) {
+    out += printIdentifier(n.name);
+    out += space;
+  }
+
+  out += printLimit(n.limits);
+  out += space;
+  out += n.elementType;
+  out += ")";
+  return out;
+}
+
+function printFuncParam(n) {
+  var out = "";
+
+  if (typeof n.id === "string") {
+    out += "$" + n.id;
+    out += space;
+  }
+
+  out += n.valtype;
+  return out;
+}
+
+function printFunc(n, depth) {
+  var out = "";
+  out += "(";
+  out += "func";
+
+  if (n.name != null) {
+    if (n.name.type === "Identifier" && (0, _ast.isAnonymous)(n.name) === false) {
+      out += space;
+      out += printIdentifier(n.name);
+    }
+  }
+
+  if (n.signature.type === "Signature") {
+    out += printSignature(n.signature);
+  } else {
+    var index = n.signature;
+    out += space;
+    out += "(";
+    out += "type";
+    out += space;
+    out += printIndex(index);
+    out += ")";
+  }
+
+  if (n.body.length > 0) {
+    // func is empty since we ignore the default end instruction
+    if (n.body.length === 1 && n.body[0].id === "end") {
+      out += ")";
+      return out;
+    }
+
+    if (compact === false) {
+      out += "\n";
+    }
+
+    n.body.forEach(function (i) {
+      if (i.id !== "end") {
+        out += indent(depth);
+        out += printInstruction(i, depth);
+
+        if (compact === false) {
+          out += "\n";
+        }
+      }
+    });
+    out += indent(depth - 1) + ")";
+  } else {
+    out += ")";
+  }
+
+  return out;
+}
+
+function printInstruction(n, depth) {
+  switch (n.type) {
+    case "Instr":
+      // $FlowIgnore
+      return printGenericInstruction(n, depth + 1);
+
+    case "BlockInstruction":
+      // $FlowIgnore
+      return printBlockInstruction(n, depth + 1);
+
+    case "IfInstruction":
+      // $FlowIgnore
+      return printIfInstruction(n, depth + 1);
+
+    case "CallInstruction":
+      // $FlowIgnore
+      return printCallInstruction(n, depth + 1);
+
+    case "CallIndirectInstruction":
+      // $FlowIgnore
+      return printCallIndirectIntruction(n, depth + 1);
+
+    case "LoopInstruction":
+      // $FlowIgnore
+      return printLoopInstruction(n, depth + 1);
+
+    default:
+      throw new Error("Unsupported instruction: " + JSON.stringify(n.type));
+  }
+}
+
+function printCallIndirectIntruction(n, depth) {
+  var out = "";
+  out += "(";
+  out += "call_indirect";
+
+  if (n.signature.type === "Signature") {
+    out += printSignature(n.signature);
+  } else if (n.signature.type === "Identifier") {
+    out += space;
+    out += "(";
+    out += "type";
+    out += space;
+    out += printIdentifier(n.signature);
+    out += ")";
+  } else {
+    throw new Error("CallIndirectInstruction: unsupported signature " + JSON.stringify(n.signature.type));
+  }
+
+  out += space;
+
+  if (n.intrs != null) {
+    // $FlowIgnore
+    n.intrs.forEach(function (i, index) {
+      // $FlowIgnore
+      out += printInstruction(i, depth + 1); // $FlowIgnore
+
+      if (index !== n.intrs.length - 1) {
+        out += space;
+      }
+    });
+  }
+
+  out += ")";
+  return out;
+}
+
+function printLoopInstruction(n, depth) {
+  var out = "";
+  out += "(";
+  out += "loop";
+
+  if (n.label != null && (0, _ast.isAnonymous)(n.label) === false) {
+    out += space;
+    out += printIdentifier(n.label);
+  }
+
+  if (typeof n.resulttype === "string") {
+    out += space;
+    out += "(";
+    out += "result";
+    out += space;
+    out += n.resulttype;
+    out += ")";
+  }
+
+  if (n.instr.length > 0) {
+    n.instr.forEach(function (e) {
+      if (compact === false) {
+        out += "\n";
+      }
+
+      out += indent(depth);
+      out += printInstruction(e, depth + 1);
+    });
+
+    if (compact === false) {
+      out += "\n";
+      out += indent(depth - 1);
+    }
+  }
+
+  out += ")";
+  return out;
+}
+
+function printCallInstruction(n, depth) {
+  var out = "";
+  out += "(";
+  out += "call";
+  out += space;
+  out += printIndex(n.index);
+
+  if (_typeof(n.instrArgs) === "object") {
+    // $FlowIgnore
+    n.instrArgs.forEach(function (arg) {
+      out += space;
+      out += printFuncInstructionArg(arg, depth + 1);
+    });
+  }
+
+  out += ")";
+  return out;
+}
+
+function printIfInstruction(n, depth) {
+  var out = "";
+  out += "(";
+  out += "if";
+
+  if (n.testLabel != null && (0, _ast.isAnonymous)(n.testLabel) === false) {
+    out += space;
+    out += printIdentifier(n.testLabel);
+  }
+
+  if (typeof n.result === "string") {
+    out += space;
+    out += "(";
+    out += "result";
+    out += space;
+    out += n.result;
+    out += ")";
+  }
+
+  if (n.test.length > 0) {
+    out += space;
+    n.test.forEach(function (i) {
+      out += printInstruction(i, depth + 1);
+    });
+  }
+
+  if (n.consequent.length > 0) {
+    if (compact === false) {
+      out += "\n";
+    }
+
+    out += indent(depth);
+    out += "(";
+    out += "then";
+    depth++;
+    n.consequent.forEach(function (i) {
+      if (compact === false) {
+        out += "\n";
+      }
+
+      out += indent(depth);
+      out += printInstruction(i, depth + 1);
+    });
+    depth--;
+
+    if (compact === false) {
+      out += "\n";
+      out += indent(depth);
+    }
+
+    out += ")";
+  } else {
+    if (compact === false) {
+      out += "\n";
+      out += indent(depth);
+    }
+
+    out += "(";
+    out += "then";
+    out += ")";
+  }
+
+  if (n.alternate.length > 0) {
+    if (compact === false) {
+      out += "\n";
+    }
+
+    out += indent(depth);
+    out += "(";
+    out += "else";
+    depth++;
+    n.alternate.forEach(function (i) {
+      if (compact === false) {
+        out += "\n";
+      }
+
+      out += indent(depth);
+      out += printInstruction(i, depth + 1);
+    });
+    depth--;
+
+    if (compact === false) {
+      out += "\n";
+      out += indent(depth);
+    }
+
+    out += ")";
+  } else {
+    if (compact === false) {
+      out += "\n";
+      out += indent(depth);
+    }
+
+    out += "(";
+    out += "else";
+    out += ")";
+  }
+
+  if (compact === false) {
+    out += "\n";
+    out += indent(depth - 1);
+  }
+
+  out += ")";
+  return out;
+}
+
+function printBlockInstruction(n, depth) {
+  var out = "";
+  out += "(";
+  out += "block";
+
+  if (n.label != null && (0, _ast.isAnonymous)(n.label) === false) {
+    out += space;
+    out += printIdentifier(n.label);
+  }
+
+  if (typeof n.result === "string") {
+    out += space;
+    out += "(";
+    out += "result";
+    out += space;
+    out += n.result;
+    out += ")";
+  }
+
+  if (n.instr.length > 0) {
+    n.instr.forEach(function (i) {
+      if (compact === false) {
+        out += "\n";
+      }
+
+      out += indent(depth);
+      out += printInstruction(i, depth + 1);
+    });
+
+    if (compact === false) {
+      out += "\n";
+    }
+
+    out += indent(depth - 1);
+    out += ")";
+  } else {
+    out += ")";
+  }
+
+  return out;
+}
+
+function printGenericInstruction(n, depth) {
+  var out = "";
+  out += "(";
+
+  if (typeof n.object === "string") {
+    out += n.object;
+    out += ".";
+  }
+
+  out += n.id;
+  n.args.forEach(function (arg) {
+    out += space;
+    out += printFuncInstructionArg(arg, depth + 1);
+  });
+
+  if (n.namedArgs !== undefined) {
+    for (var key in n.namedArgs) {
+      out += space + key + "=";
+      out += printFuncInstructionArg(n.namedArgs[key], depth + 1);
+    }
+  }
+
+  out += ")";
+  return out;
+}
+
+function printLongNumberLiteral(n) {
+  if (typeof n.raw === "string") {
+    return n.raw;
+  }
+
+  var _n$value = n.value,
+      low = _n$value.low,
+      high = _n$value.high;
+  var v = new _long["default"](low, high);
+  return v.toString();
+}
+
+function printFloatLiteral(n) {
+  if (typeof n.raw === "string") {
+    return n.raw;
+  }
+
+  return String(n.value);
+}
+
+function printFuncInstructionArg(n, depth) {
+  var out = "";
+
+  if (n.type === "NumberLiteral") {
+    out += printNumberLiteral(n);
+  }
+
+  if (n.type === "LongNumberLiteral") {
+    out += printLongNumberLiteral(n);
+  }
+
+  if (n.type === "Identifier" && (0, _ast.isAnonymous)(n) === false) {
+    out += printIdentifier(n);
+  }
+
+  if (n.type === "ValtypeLiteral") {
+    out += n.name;
+  }
+
+  if (n.type === "FloatLiteral") {
+    out += printFloatLiteral(n);
+  }
+
+  if ((0, _ast.isInstruction)(n)) {
+    out += printInstruction(n, depth + 1);
+  }
+
+  return out;
+}
+
+function printNumberLiteral(n) {
+  if (typeof n.raw === "string") {
+    return n.raw;
+  }
+
+  return String(n.value);
+}
+
+function printModuleExport(n) {
+  var out = "";
+  out += "(";
+  out += "export";
+  out += space;
+  out += quote(n.name);
+
+  if (n.descr.exportType === "Func") {
+    out += space;
+    out += "(";
+    out += "func";
+    out += space;
+    out += printIndex(n.descr.id);
+    out += ")";
+  } else if (n.descr.exportType === "Global") {
+    out += space;
+    out += "(";
+    out += "global";
+    out += space;
+    out += printIndex(n.descr.id);
+    out += ")";
+  } else if (n.descr.exportType === "Memory") {
+    out += space;
+    out += "(";
+    out += "memory";
+    out += space;
+    out += printIndex(n.descr.id);
+    out += ")";
+  } else if (n.descr.exportType === "Table") {
+    out += space;
+    out += "(";
+    out += "table";
+    out += space;
+    out += printIndex(n.descr.id);
+    out += ")";
+  } else {
+    throw new Error("printModuleExport: unknown type: " + n.descr.exportType);
+  }
+
+  out += ")";
+  return out;
+}
+
+function printIdentifier(n) {
+  return "$" + n.value;
+}
+
+function printIndex(n) {
+  if (n.type === "Identifier") {
+    return printIdentifier(n);
+  } else if (n.type === "NumberLiteral") {
+    return printNumberLiteral(n);
+  } else {
+    throw new Error("Unsupported index: " + n.type);
+  }
+}
+
+function printMemory(n) {
+  var out = "";
+  out += "(";
+  out += "memory";
+
+  if (n.id != null) {
+    out += space;
+    out += printIndex(n.id);
+    out += space;
+  }
+
+  out += printLimit(n.limits);
+  out += ")";
+  return out;
+}
+
+function printLimit(n) {
+  var out = "";
+  out += n.min + "";
+
+  if (n.max != null) {
+    out += space;
+    out += String(n.max);
+
+    if (n.shared === true) {
+      out += " shared";
+    }
+  }
+
+  return out;
+}