RAHHH

backend/frontend/node_modules/webpack-cli/bin/cli.js

@@ -0,0 +1,17 @@
+#!/usr/bin/env node
+
+"use strict";
+
+const importLocal = require("import-local");
+const runCLI = require("../lib/bootstrap");
+
+if (!process.env.WEBPACK_CLI_SKIP_IMPORT_LOCAL) {
+  // Prefer the local installation of `webpack-cli`
+  if (importLocal(__filename)) {
+    return;
+  }
+}
+
+process.title = "webpack";
+
+runCLI(process.argv);

backend/frontend/node_modules/webpack-cli/lib/bootstrap.d.ts

@@ -0,0 +1 @@
+export {};

backend/frontend/node_modules/webpack-cli/lib/bootstrap.js

@@ -0,0 +1,16 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+// eslint-disable-next-line @typescript-eslint/no-var-requires
+const WebpackCLI = require("./webpack-cli");
+const runCLI = async (args) => {
+    // Create a new instance of the CLI object
+    const cli = new WebpackCLI();
+    try {
+        await cli.run(args);
+    }
+    catch (error) {
+        cli.logger.error(error);
+        process.exit(2);
+    }
+};
+module.exports = runCLI;

backend/frontend/node_modules/webpack-cli/lib/index.d.ts

@@ -0,0 +1 @@
+export type * from "./types";

backend/frontend/node_modules/webpack-cli/lib/index.js

@@ -0,0 +1,5 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+// eslint-disable-next-line @typescript-eslint/no-var-requires
+const CLI = require("./webpack-cli");
+module.exports = CLI;

backend/frontend/node_modules/webpack-cli/lib/plugins/cli-plugin.d.ts

@@ -0,0 +1,12 @@
+import { type Compiler } from "webpack";
+import { type CLIPluginOptions } from "../types";
+export declare class CLIPlugin {
+    #private;
+    logger: ReturnType<Compiler["getInfrastructureLogger"]>;
+    options: CLIPluginOptions;
+    constructor(options: CLIPluginOptions);
+    setupBundleAnalyzerPlugin(compiler: Compiler): Promise<void>;
+    setupProgressPlugin(compiler: Compiler): void;
+    setupHelpfulOutput(compiler: Compiler): void;
+    apply(compiler: Compiler): void;
+}

backend/frontend/node_modules/webpack-cli/lib/plugins/cli-plugin.js

@@ -0,0 +1,108 @@
+"use strict";
+var __classPrivateFieldGet = (this && this.__classPrivateFieldGet) || function (receiver, state, kind, f) {
+    if (kind === "a" && !f) throw new TypeError("Private accessor was defined without a getter");
+    if (typeof state === "function" ? receiver !== state || !f : !state.has(receiver)) throw new TypeError("Cannot read private member from an object whose class did not declare it");
+    return kind === "m" ? f : kind === "a" ? f.call(receiver) : f ? f.value : state.get(receiver);
+};
+var _a, _CLIPlugin_progressStates;
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.CLIPlugin = void 0;
+class CLIPlugin {
+    constructor(options) {
+        this.options = options;
+    }
+    async setupBundleAnalyzerPlugin(compiler) {
+        // eslint-disable-next-line node/no-extraneous-require,@typescript-eslint/no-var-requires
+        const { BundleAnalyzerPlugin } = require("webpack-bundle-analyzer");
+        const bundleAnalyzerPlugin = Boolean(compiler.options.plugins.find((plugin) => plugin instanceof BundleAnalyzerPlugin));
+        if (!bundleAnalyzerPlugin) {
+            new BundleAnalyzerPlugin().apply(compiler);
+        }
+    }
+    setupProgressPlugin(compiler) {
+        const { ProgressPlugin } = compiler.webpack || require("webpack");
+        const progressPlugin = Boolean(compiler.options.plugins.find((plugin) => plugin instanceof ProgressPlugin));
+        if (progressPlugin) {
+            return;
+        }
+        const isProfile = this.options.progress === "profile";
+        const options = {
+            profile: isProfile,
+        };
+        if (this.options.isMultiCompiler && ProgressPlugin.createDefaultHandler) {
+            const handler = ProgressPlugin.createDefaultHandler(isProfile, compiler.getInfrastructureLogger("webpack.Progress"));
+            const idx = __classPrivateFieldGet(CLIPlugin, _a, "f", _CLIPlugin_progressStates).length;
+            __classPrivateFieldGet(CLIPlugin, _a, "f", _CLIPlugin_progressStates)[idx] = [0];
+            options.handler = (p, msg, ...args) => {
+                __classPrivateFieldGet(CLIPlugin, _a, "f", _CLIPlugin_progressStates)[idx] = [p, msg, ...args];
+                let sum = 0;
+                for (const [p] of __classPrivateFieldGet(CLIPlugin, _a, "f", _CLIPlugin_progressStates)) {
+                    sum += p;
+                }
+                handler(sum / __classPrivateFieldGet(CLIPlugin, _a, "f", _CLIPlugin_progressStates).length, `[${compiler.name ? compiler.name : idx}] ${msg}`, ...args);
+            };
+        }
+        new ProgressPlugin(options).apply(compiler);
+    }
+    setupHelpfulOutput(compiler) {
+        const pluginName = "webpack-cli";
+        const getCompilationName = () => (compiler.name ? `'${compiler.name}'` : "");
+        const logCompilation = (message) => {
+            if (process.env.WEBPACK_CLI_START_FINISH_FORCE_LOG) {
+                process.stderr.write(message);
+            }
+            else {
+                this.logger.log(message);
+            }
+        };
+        const { configPath } = this.options;
+        compiler.hooks.run.tap(pluginName, () => {
+            const name = getCompilationName();
+            logCompilation(`Compiler${name ? ` ${name}` : ""} starting... `);
+            if (configPath) {
+                this.logger.log(`Compiler${name ? ` ${name}` : ""} is using config: ${configPath
+                    .map((path) => `'${path}'`)
+                    .join(", ")}`);
+            }
+        });
+        compiler.hooks.watchRun.tap(pluginName, (compiler) => {
+            const { bail, watch } = compiler.options;
+            if (bail && watch) {
+                this.logger.warn('You are using "bail" with "watch". "bail" will still exit webpack when the first error is found.');
+            }
+            const name = getCompilationName();
+            logCompilation(`Compiler${name ? ` ${name}` : ""} starting... `);
+            if (configPath) {
+                this.logger.log(`Compiler${name ? ` ${name}` : ""} is using config: '${configPath}'`);
+            }
+        });
+        compiler.hooks.invalid.tap(pluginName, (filename, changeTime) => {
+            const date = new Date(changeTime);
+            this.logger.log(`File '${filename}' was modified`);
+            this.logger.log(`Changed time is ${date} (timestamp is ${changeTime})`);
+        });
+        (compiler.webpack ? compiler.hooks.afterDone : compiler.hooks.done).tap(pluginName, () => {
+            const name = getCompilationName();
+            logCompilation(`Compiler${name ? ` ${name}` : ""} finished`);
+            process.nextTick(() => {
+                if (compiler.watchMode) {
+                    this.logger.log(`Compiler${name ? `${name}` : ""} is watching files for updates...`);
+                }
+            });
+        });
+    }
+    apply(compiler) {
+        this.logger = compiler.getInfrastructureLogger("webpack-cli");
+        if (this.options.progress) {
+            this.setupProgressPlugin(compiler);
+        }
+        if (this.options.analyze) {
+            this.setupBundleAnalyzerPlugin(compiler);
+        }
+        this.setupHelpfulOutput(compiler);
+    }
+}
+exports.CLIPlugin = CLIPlugin;
+_a = CLIPlugin;
+_CLIPlugin_progressStates = { value: [] };
+module.exports = CLIPlugin;

backend/frontend/node_modules/webpack-cli/lib/types.d.ts

@@ -0,0 +1,230 @@
+/// <reference types="node" />
+import type { EntryOptions, Stats, Configuration, WebpackError, StatsOptions, WebpackOptionsNormalized, Compiler, MultiCompiler, Problem, Argument, AssetEmittedInfo, FileCacheOptions } from "webpack";
+import type webpack from "webpack";
+import type { ClientConfiguration, Configuration as DevServerConfig } from "webpack-dev-server";
+import { type Colorette } from "colorette";
+import { type Command, type CommandOptions, type Option, type ParseOptions } from "commander";
+import { type prepare } from "rechoir";
+import { type stringifyStream } from "@discoveryjs/json-ext";
+/**
+ * Webpack CLI
+ */
+interface IWebpackCLI {
+    colors: WebpackCLIColors;
+    logger: WebpackCLILogger;
+    isColorSupportChanged: boolean | undefined;
+    webpack: typeof webpack;
+    builtInOptionsCache: WebpackCLIBuiltInOption[] | undefined;
+    program: WebpackCLICommand;
+    isMultipleCompiler(compiler: WebpackCompiler): compiler is MultiCompiler;
+    isPromise<T>(value: Promise<T>): value is Promise<T>;
+    isFunction(value: unknown): value is CallableFunction;
+    getLogger(): WebpackCLILogger;
+    createColors(useColors?: boolean): WebpackCLIColors;
+    toKebabCase: StringFormatter;
+    capitalizeFirstLetter: StringFormatter;
+    checkPackageExists(packageName: string): boolean;
+    getAvailablePackageManagers(): PackageManager[];
+    getDefaultPackageManager(): PackageManager | undefined;
+    doInstall(packageName: string, options?: PackageInstallOptions): Promise<string>;
+    loadJSONFile<T = unknown>(path: Path, handleError: boolean): Promise<T>;
+    tryRequireThenImport<T = unknown>(module: ModuleName, handleError: boolean): Promise<T>;
+    getInfoOptions(): WebpackCLIBuiltInOption[];
+    getInfoOutput(options: {
+        output: string;
+        additionalPackage: string[];
+    }): Promise<string>;
+    makeCommand(commandOptions: WebpackCLIOptions, options: WebpackCLICommandOptions, action: CommandAction): Promise<WebpackCLICommand | undefined>;
+    makeOption(command: WebpackCLICommand, option: WebpackCLIBuiltInOption): void;
+    run(args: Parameters<WebpackCLICommand["parseOptions"]>[0], parseOptions?: ParseOptions): Promise<void>;
+    getBuiltInOptions(): WebpackCLIBuiltInOption[];
+    loadWebpack(handleError?: boolean): Promise<typeof webpack>;
+    loadConfig(options: Partial<WebpackDevServerOptions>): Promise<WebpackCLIConfig>;
+    buildConfig(config: WebpackCLIConfig, options: WebpackDevServerOptions): Promise<WebpackCLIConfig>;
+    isValidationError(error: Error): error is WebpackError;
+    createCompiler(options: Partial<WebpackDevServerOptions>, callback?: Callback<[Error | undefined, WebpackCLIStats | undefined]>): Promise<WebpackCompiler>;
+    needWatchStdin(compiler: Compiler | MultiCompiler): boolean;
+    runWebpack(options: WebpackRunOptions, isWatchCommand: boolean): Promise<void>;
+}
+interface WebpackCLIColors extends Colorette {
+    isColorSupported: boolean;
+}
+interface WebpackCLILogger {
+    error: LogHandler;
+    warn: LogHandler;
+    info: LogHandler;
+    success: LogHandler;
+    log: LogHandler;
+    raw: LogHandler;
+}
+interface WebpackCLICommandOption extends CommanderOption {
+    helpLevel?: "minimum" | "verbose";
+}
+interface WebpackCLIConfig {
+    options: WebpackConfiguration | WebpackConfiguration[];
+    path: WeakMap<object, string[]>;
+}
+interface WebpackCLICommand extends Command {
+    pkg: string | undefined;
+    forHelp: boolean | undefined;
+    _args: WebpackCLICommandOption[];
+}
+interface WebpackCLIStats extends Stats {
+    presetToOptions?: (item: string | boolean) => StatsOptions;
+}
+type WebpackCLIMainOption = Pick<WebpackCLIBuiltInOption, "valueName" | "description" | "defaultValue" | "multiple"> & {
+    flags: string;
+    type: Set<BooleanConstructor | StringConstructor | NumberConstructor>;
+};
+interface WebpackCLIOptions extends CommandOptions {
+    name: string;
+    alias: string | string[];
+    description?: string;
+    usage?: string;
+    dependencies?: string[];
+    pkg?: string;
+    argsDescription?: {
+        [argName: string]: string;
+    };
+}
+type WebpackCLICommandOptions = WebpackCLIBuiltInOption[] | (() => Promise<WebpackCLIBuiltInOption[]>);
+interface WebpackCLIBuiltInFlag {
+    name: string;
+    alias?: string;
+    type?: (value: string, previous: Record<string, BasicPrimitive | object>) => Record<string, BasicPrimitive | object>;
+    configs?: Partial<FlagConfig>[];
+    negative?: boolean;
+    multiple?: boolean;
+    valueName?: string;
+    description: string;
+    describe?: string;
+    negatedDescription?: string;
+    defaultValue?: string;
+    helpLevel: "minimum" | "verbose";
+}
+interface WebpackCLIBuiltInOption extends WebpackCLIBuiltInFlag {
+    hidden?: boolean;
+    group?: "core";
+}
+type WebpackCLIExternalCommandInfo = Pick<WebpackCLIOptions, "name" | "alias" | "description"> & {
+    pkg: string;
+};
+/**
+ * Webpack dev server
+ */
+type WebpackDevServerOptions = DevServerConfig & WebpackConfiguration & ClientConfiguration & AssetEmittedInfo & WebpackOptionsNormalized & FileCacheOptions & Argv & {
+    nodeEnv?: "string";
+    watchOptionsStdin?: boolean;
+    progress?: boolean | "profile" | undefined;
+    analyze?: boolean;
+    prefetch?: string;
+    json?: boolean;
+    entry: EntryOptions;
+    merge?: boolean;
+    config: string[];
+    configName?: string[];
+    disableInterpret?: boolean;
+    extends?: string[];
+    argv: Argv;
+};
+type Callback<T extends unknown[]> = (...args: T) => void;
+/**
+ * Webpack
+ */
+type WebpackConfiguration = Configuration;
+type ConfigOptions = PotentialPromise<WebpackConfiguration | CallableOption>;
+type CallableOption = (env: Env | undefined, argv: Argv) => WebpackConfiguration;
+type WebpackCompiler = Compiler | MultiCompiler;
+type FlagType = boolean | "enum" | "string" | "path" | "number" | "boolean" | "RegExp" | "reset";
+type FlagConfig = {
+    negatedDescription: string;
+    type: FlagType;
+    values: FlagType[];
+};
+type FileSystemCacheOptions = WebpackConfiguration & {
+    cache: FileCacheOptions & {
+        defaultConfig: string[];
+    };
+};
+type ProcessedArguments = Record<string, BasicPrimitive | RegExp | (BasicPrimitive | RegExp)[]>;
+type CommandAction = Parameters<WebpackCLICommand["action"]>[0];
+interface WebpackRunOptions extends WebpackOptionsNormalized {
+    progress?: boolean | "profile";
+    json?: boolean;
+    argv?: Argv;
+    env: Env;
+    failOnWarnings?: boolean;
+    isWatchingLikeCommand?: boolean;
+}
+/**
+ * Package management
+ */
+type PackageManager = "pnpm" | "yarn" | "npm";
+interface PackageInstallOptions {
+    preMessage?: () => void;
+}
+interface BasicPackageJsonContent {
+    name: string;
+    version: string;
+    description: string;
+    license: string;
+}
+/**
+ * Plugins and util types
+ */
+interface CLIPluginOptions {
+    isMultiCompiler?: boolean;
+    configPath?: string[];
+    helpfulOutput: boolean;
+    hot?: boolean | "only";
+    progress?: boolean | "profile";
+    prefetch?: string;
+    analyze?: boolean;
+}
+type BasicPrimitive = string | boolean | number;
+type Instantiable<InstanceType = unknown, ConstructorParameters extends unknown[] = unknown[]> = {
+    new (...args: ConstructorParameters): InstanceType;
+};
+type PotentialPromise<T> = T | Promise<T>;
+type ModuleName = string;
+type Path = string;
+type LogHandler = (value: any) => void;
+type StringFormatter = (value: string) => string;
+interface Argv extends Record<string, any> {
+    env?: Env;
+}
+interface Env {
+    WEBPACK_BUNDLE?: boolean;
+    WEBPACK_BUILD?: boolean;
+    WEBPACK_WATCH?: boolean;
+    WEBPACK_SERVE?: boolean;
+    WEBPACK_PACKAGE?: string;
+    WEBPACK_DEV_SERVER_PACKAGE?: string;
+}
+type DynamicImport<T> = (url: string) => Promise<{
+    default: T;
+}>;
+interface ImportLoaderError extends Error {
+    code?: string;
+}
+/**
+ * External libraries types
+ */
+type OptionConstructor = new (flags: string, description?: string) => Option;
+type CommanderOption = InstanceType<OptionConstructor>;
+interface Rechoir {
+    prepare: typeof prepare;
+}
+interface JsonExt {
+    stringifyStream: typeof stringifyStream;
+}
+interface RechoirError extends Error {
+    failures: RechoirError[];
+    error: Error;
+}
+interface PromptOptions {
+    message: string;
+    defaultResponse: string;
+    stream: NodeJS.WritableStream;
+}
+export { IWebpackCLI, WebpackCLICommandOption, WebpackCLIBuiltInOption, WebpackCLIBuiltInFlag, WebpackCLIColors, WebpackCLIStats, WebpackCLIConfig, WebpackCLIExternalCommandInfo, WebpackCLIOptions, WebpackCLICommand, WebpackCLICommandOptions, WebpackCLIMainOption, WebpackCLILogger, WebpackDevServerOptions, WebpackRunOptions, WebpackCompiler, WebpackConfiguration, Argv, Argument, BasicPrimitive, BasicPackageJsonContent, CallableOption, Callback, CLIPluginOptions, CommandAction, CommanderOption, CommandOptions, ConfigOptions, DynamicImport, FileSystemCacheOptions, FlagConfig, ImportLoaderError, Instantiable, JsonExt, ModuleName, PackageInstallOptions, PackageManager, Path, ProcessedArguments, PromptOptions, Problem, PotentialPromise, Rechoir, RechoirError, };

backend/frontend/node_modules/webpack-cli/lib/types.js

@@ -0,0 +1,2 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });

backend/frontend/node_modules/webpack-cli/lib/utils/dynamic-import-loader.d.ts

@@ -0,0 +1 @@
+export {};

backend/frontend/node_modules/webpack-cli/lib/utils/dynamic-import-loader.js

@@ -0,0 +1,13 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+function dynamicImportLoader() {
+    let importESM;
+    try {
+        importESM = new Function("id", "return import(id);");
+    }
+    catch (e) {
+        importESM = null;
+    }
+    return importESM;
+}
+module.exports = dynamicImportLoader;

backend/frontend/node_modules/webpack-cli/lib/webpack-cli.d.ts

@@ -0,0 +1 @@
+export {};

backend/frontend/node_modules/webpack-cli/node_modules/commander/lib/argument.js

@@ -0,0 +1,147 @@
+const { InvalidArgumentError } = require('./error.js');
+
+// @ts-check
+
+class Argument {
+  /**
+   * Initialize a new command argument with the given name and description.
+   * The default is that the argument is required, and you can explicitly
+   * indicate this with <> around the name. Put [] around the name for an optional argument.
+   *
+   * @param {string} name
+   * @param {string} [description]
+   */
+
+  constructor(name, description) {
+    this.description = description || '';
+    this.variadic = false;
+    this.parseArg = undefined;
+    this.defaultValue = undefined;
+    this.defaultValueDescription = undefined;
+    this.argChoices = undefined;
+
+    switch (name[0]) {
+      case '<': // e.g. <required>
+        this.required = true;
+        this._name = name.slice(1, -1);
+        break;
+      case '[': // e.g. [optional]
+        this.required = false;
+        this._name = name.slice(1, -1);
+        break;
+      default:
+        this.required = true;
+        this._name = name;
+        break;
+    }
+
+    if (this._name.length > 3 && this._name.slice(-3) === '...') {
+      this.variadic = true;
+      this._name = this._name.slice(0, -3);
+    }
+  }
+
+  /**
+   * Return argument name.
+   *
+   * @return {string}
+   */
+
+  name() {
+    return this._name;
+  }
+
+  /**
+   * @api private
+   */
+
+  _concatValue(value, previous) {
+    if (previous === this.defaultValue || !Array.isArray(previous)) {
+      return [value];
+    }
+
+    return previous.concat(value);
+  }
+
+  /**
+   * Set the default value, and optionally supply the description to be displayed in the help.
+   *
+   * @param {any} value
+   * @param {string} [description]
+   * @return {Argument}
+   */
+
+  default(value, description) {
+    this.defaultValue = value;
+    this.defaultValueDescription = description;
+    return this;
+  }
+
+  /**
+   * Set the custom handler for processing CLI command arguments into argument values.
+   *
+   * @param {Function} [fn]
+   * @return {Argument}
+   */
+
+  argParser(fn) {
+    this.parseArg = fn;
+    return this;
+  }
+
+  /**
+   * Only allow argument value to be one of choices.
+   *
+   * @param {string[]} values
+   * @return {Argument}
+   */
+
+  choices(values) {
+    this.argChoices = values.slice();
+    this.parseArg = (arg, previous) => {
+      if (!this.argChoices.includes(arg)) {
+        throw new InvalidArgumentError(`Allowed choices are ${this.argChoices.join(', ')}.`);
+      }
+      if (this.variadic) {
+        return this._concatValue(arg, previous);
+      }
+      return arg;
+    };
+    return this;
+  }
+
+  /**
+   * Make argument required.
+   */
+  argRequired() {
+    this.required = true;
+    return this;
+  }
+
+  /**
+   * Make argument optional.
+   */
+  argOptional() {
+    this.required = false;
+    return this;
+  }
+}
+
+/**
+ * Takes an argument and returns its human readable equivalent for help usage.
+ *
+ * @param {Argument} arg
+ * @return {string}
+ * @api private
+ */
+
+function humanReadableArgName(arg) {
+  const nameOutput = arg.name() + (arg.variadic === true ? '...' : '');
+
+  return arg.required
+    ? '<' + nameOutput + '>'
+    : '[' + nameOutput + ']';
+}
+
+exports.Argument = Argument;
+exports.humanReadableArgName = humanReadableArgName;

backend/frontend/node_modules/webpack-cli/node_modules/commander/lib/error.js

@@ -0,0 +1,45 @@
+// @ts-check
+
+/**
+ * CommanderError class
+ * @class
+ */
+class CommanderError extends Error {
+  /**
+   * Constructs the CommanderError class
+   * @param {number} exitCode suggested exit code which could be used with process.exit
+   * @param {string} code an id string representing the error
+   * @param {string} message human-readable description of the error
+   * @constructor
+   */
+  constructor(exitCode, code, message) {
+    super(message);
+    // properly capture stack trace in Node.js
+    Error.captureStackTrace(this, this.constructor);
+    this.name = this.constructor.name;
+    this.code = code;
+    this.exitCode = exitCode;
+    this.nestedError = undefined;
+  }
+}
+
+/**
+ * InvalidArgumentError class
+ * @class
+ */
+class InvalidArgumentError extends CommanderError {
+  /**
+   * Constructs the InvalidArgumentError class
+   * @param {string} [message] explanation of why argument is invalid
+   * @constructor
+   */
+  constructor(message) {
+    super(1, 'commander.invalidArgument', message);
+    // properly capture stack trace in Node.js
+    Error.captureStackTrace(this, this.constructor);
+    this.name = this.constructor.name;
+  }
+}
+
+exports.CommanderError = CommanderError;
+exports.InvalidArgumentError = InvalidArgumentError;

backend/frontend/node_modules/webpack-cli/node_modules/commander/lib/help.js

@@ -0,0 +1,464 @@
+const { humanReadableArgName } = require('./argument.js');
+
+/**
+ * TypeScript import types for JSDoc, used by Visual Studio Code IntelliSense and `npm run typescript-checkJS`
+ * https://www.typescriptlang.org/docs/handbook/jsdoc-supported-types.html#import-types
+ * @typedef { import("./argument.js").Argument } Argument
+ * @typedef { import("./command.js").Command } Command
+ * @typedef { import("./option.js").Option } Option
+ */
+
+// @ts-check
+
+// Although this is a class, methods are static in style to allow override using subclass or just functions.
+class Help {
+  constructor() {
+    this.helpWidth = undefined;
+    this.sortSubcommands = false;
+    this.sortOptions = false;
+    this.showGlobalOptions = false;
+  }
+
+  /**
+   * Get an array of the visible subcommands. Includes a placeholder for the implicit help command, if there is one.
+   *
+   * @param {Command} cmd
+   * @returns {Command[]}
+   */
+
+  visibleCommands(cmd) {
+    const visibleCommands = cmd.commands.filter(cmd => !cmd._hidden);
+    if (cmd._hasImplicitHelpCommand()) {
+      // Create a command matching the implicit help command.
+      const [, helpName, helpArgs] = cmd._helpCommandnameAndArgs.match(/([^ ]+) *(.*)/);
+      const helpCommand = cmd.createCommand(helpName)
+        .helpOption(false);
+      helpCommand.description(cmd._helpCommandDescription);
+      if (helpArgs) helpCommand.arguments(helpArgs);
+      visibleCommands.push(helpCommand);
+    }
+    if (this.sortSubcommands) {
+      visibleCommands.sort((a, b) => {
+        // @ts-ignore: overloaded return type
+        return a.name().localeCompare(b.name());
+      });
+    }
+    return visibleCommands;
+  }
+
+  /**
+   * Compare options for sort.
+   *
+   * @param {Option} a
+   * @param {Option} b
+   * @returns number
+   */
+  compareOptions(a, b) {
+    const getSortKey = (option) => {
+      // WYSIWYG for order displayed in help. Short used for comparison if present. No special handling for negated.
+      return option.short ? option.short.replace(/^-/, '') : option.long.replace(/^--/, '');
+    };
+    return getSortKey(a).localeCompare(getSortKey(b));
+  }
+
+  /**
+   * Get an array of the visible options. Includes a placeholder for the implicit help option, if there is one.
+   *
+   * @param {Command} cmd
+   * @returns {Option[]}
+   */
+
+  visibleOptions(cmd) {
+    const visibleOptions = cmd.options.filter((option) => !option.hidden);
+    // Implicit help
+    const showShortHelpFlag = cmd._hasHelpOption && cmd._helpShortFlag && !cmd._findOption(cmd._helpShortFlag);
+    const showLongHelpFlag = cmd._hasHelpOption && !cmd._findOption(cmd._helpLongFlag);
+    if (showShortHelpFlag || showLongHelpFlag) {
+      let helpOption;
+      if (!showShortHelpFlag) {
+        helpOption = cmd.createOption(cmd._helpLongFlag, cmd._helpDescription);
+      } else if (!showLongHelpFlag) {
+        helpOption = cmd.createOption(cmd._helpShortFlag, cmd._helpDescription);
+      } else {
+        helpOption = cmd.createOption(cmd._helpFlags, cmd._helpDescription);
+      }
+      visibleOptions.push(helpOption);
+    }
+    if (this.sortOptions) {
+      visibleOptions.sort(this.compareOptions);
+    }
+    return visibleOptions;
+  }
+
+  /**
+   * Get an array of the visible global options. (Not including help.)
+   *
+   * @param {Command} cmd
+   * @returns {Option[]}
+   */
+
+  visibleGlobalOptions(cmd) {
+    if (!this.showGlobalOptions) return [];
+
+    const globalOptions = [];
+    for (let parentCmd = cmd.parent; parentCmd; parentCmd = parentCmd.parent) {
+      const visibleOptions = parentCmd.options.filter((option) => !option.hidden);
+      globalOptions.push(...visibleOptions);
+    }
+    if (this.sortOptions) {
+      globalOptions.sort(this.compareOptions);
+    }
+    return globalOptions;
+  }
+
+  /**
+   * Get an array of the arguments if any have a description.
+   *
+   * @param {Command} cmd
+   * @returns {Argument[]}
+   */
+
+  visibleArguments(cmd) {
+    // Side effect! Apply the legacy descriptions before the arguments are displayed.
+    if (cmd._argsDescription) {
+      cmd._args.forEach(argument => {
+        argument.description = argument.description || cmd._argsDescription[argument.name()] || '';
+      });
+    }
+
+    // If there are any arguments with a description then return all the arguments.
+    if (cmd._args.find(argument => argument.description)) {
+      return cmd._args;
+    }
+    return [];
+  }
+
+  /**
+   * Get the command term to show in the list of subcommands.
+   *
+   * @param {Command} cmd
+   * @returns {string}
+   */
+
+  subcommandTerm(cmd) {
+    // Legacy. Ignores custom usage string, and nested commands.
+    const args = cmd._args.map(arg => humanReadableArgName(arg)).join(' ');
+    return cmd._name +
+      (cmd._aliases[0] ? '|' + cmd._aliases[0] : '') +
+      (cmd.options.length ? ' [options]' : '') + // simplistic check for non-help option
+      (args ? ' ' + args : '');
+  }
+
+  /**
+   * Get the option term to show in the list of options.
+   *
+   * @param {Option} option
+   * @returns {string}
+   */
+
+  optionTerm(option) {
+    return option.flags;
+  }
+
+  /**
+   * Get the argument term to show in the list of arguments.
+   *
+   * @param {Argument} argument
+   * @returns {string}
+   */
+
+  argumentTerm(argument) {
+    return argument.name();
+  }
+
+  /**
+   * Get the longest command term length.
+   *
+   * @param {Command} cmd
+   * @param {Help} helper
+   * @returns {number}
+   */
+
+  longestSubcommandTermLength(cmd, helper) {
+    return helper.visibleCommands(cmd).reduce((max, command) => {
+      return Math.max(max, helper.subcommandTerm(command).length);
+    }, 0);
+  }
+
+  /**
+   * Get the longest option term length.
+   *
+   * @param {Command} cmd
+   * @param {Help} helper
+   * @returns {number}
+   */
+
+  longestOptionTermLength(cmd, helper) {
+    return helper.visibleOptions(cmd).reduce((max, option) => {
+      return Math.max(max, helper.optionTerm(option).length);
+    }, 0);
+  }
+
+  /**
+   * Get the longest global option term length.
+   *
+   * @param {Command} cmd
+   * @param {Help} helper
+   * @returns {number}
+   */
+
+  longestGlobalOptionTermLength(cmd, helper) {
+    return helper.visibleGlobalOptions(cmd).reduce((max, option) => {
+      return Math.max(max, helper.optionTerm(option).length);
+    }, 0);
+  }
+
+  /**
+   * Get the longest argument term length.
+   *
+   * @param {Command} cmd
+   * @param {Help} helper
+   * @returns {number}
+   */
+
+  longestArgumentTermLength(cmd, helper) {
+    return helper.visibleArguments(cmd).reduce((max, argument) => {
+      return Math.max(max, helper.argumentTerm(argument).length);
+    }, 0);
+  }
+
+  /**
+   * Get the command usage to be displayed at the top of the built-in help.
+   *
+   * @param {Command} cmd
+   * @returns {string}
+   */
+
+  commandUsage(cmd) {
+    // Usage
+    let cmdName = cmd._name;
+    if (cmd._aliases[0]) {
+      cmdName = cmdName + '|' + cmd._aliases[0];
+    }
+    let parentCmdNames = '';
+    for (let parentCmd = cmd.parent; parentCmd; parentCmd = parentCmd.parent) {
+      parentCmdNames = parentCmd.name() + ' ' + parentCmdNames;
+    }
+    return parentCmdNames + cmdName + ' ' + cmd.usage();
+  }
+
+  /**
+   * Get the description for the command.
+   *
+   * @param {Command} cmd
+   * @returns {string}
+   */
+
+  commandDescription(cmd) {
+    // @ts-ignore: overloaded return type
+    return cmd.description();
+  }
+
+  /**
+   * Get the subcommand summary to show in the list of subcommands.
+   * (Fallback to description for backwards compatibility.)
+   *
+   * @param {Command} cmd
+   * @returns {string}
+   */
+
+  subcommandDescription(cmd) {
+    // @ts-ignore: overloaded return type
+    return cmd.summary() || cmd.description();
+  }
+
+  /**
+   * Get the option description to show in the list of options.
+   *
+   * @param {Option} option
+   * @return {string}
+   */
+
+  optionDescription(option) {
+    const extraInfo = [];
+
+    if (option.argChoices) {
+      extraInfo.push(
+        // use stringify to match the display of the default value
+        `choices: ${option.argChoices.map((choice) => JSON.stringify(choice)).join(', ')}`);
+    }
+    if (option.defaultValue !== undefined) {
+      // default for boolean and negated more for programmer than end user,
+      // but show true/false for boolean option as may be for hand-rolled env or config processing.
+      const showDefault = option.required || option.optional ||
+        (option.isBoolean() && typeof option.defaultValue === 'boolean');
+      if (showDefault) {
+        extraInfo.push(`default: ${option.defaultValueDescription || JSON.stringify(option.defaultValue)}`);
+      }
+    }
+    // preset for boolean and negated are more for programmer than end user
+    if (option.presetArg !== undefined && option.optional) {
+      extraInfo.push(`preset: ${JSON.stringify(option.presetArg)}`);
+    }
+    if (option.envVar !== undefined) {
+      extraInfo.push(`env: ${option.envVar}`);
+    }
+    if (extraInfo.length > 0) {
+      return `${option.description} (${extraInfo.join(', ')})`;
+    }
+
+    return option.description;
+  }
+
+  /**
+   * Get the argument description to show in the list of arguments.
+   *
+   * @param {Argument} argument
+   * @return {string}
+   */
+
+  argumentDescription(argument) {
+    const extraInfo = [];
+    if (argument.argChoices) {
+      extraInfo.push(
+        // use stringify to match the display of the default value
+        `choices: ${argument.argChoices.map((choice) => JSON.stringify(choice)).join(', ')}`);
+    }
+    if (argument.defaultValue !== undefined) {
+      extraInfo.push(`default: ${argument.defaultValueDescription || JSON.stringify(argument.defaultValue)}`);
+    }
+    if (extraInfo.length > 0) {
+      const extraDescripton = `(${extraInfo.join(', ')})`;
+      if (argument.description) {
+        return `${argument.description} ${extraDescripton}`;
+      }
+      return extraDescripton;
+    }
+    return argument.description;
+  }
+
+  /**
+   * Generate the built-in help text.
+   *
+   * @param {Command} cmd
+   * @param {Help} helper
+   * @returns {string}
+   */
+
+  formatHelp(cmd, helper) {
+    const termWidth = helper.padWidth(cmd, helper);
+    const helpWidth = helper.helpWidth || 80;
+    const itemIndentWidth = 2;
+    const itemSeparatorWidth = 2; // between term and description
+    function formatItem(term, description) {
+      if (description) {
+        const fullText = `${term.padEnd(termWidth + itemSeparatorWidth)}${description}`;
+        return helper.wrap(fullText, helpWidth - itemIndentWidth, termWidth + itemSeparatorWidth);
+      }
+      return term;
+    }
+    function formatList(textArray) {
+      return textArray.join('\n').replace(/^/gm, ' '.repeat(itemIndentWidth));
+    }
+
+    // Usage
+    let output = [`Usage: ${helper.commandUsage(cmd)}`, ''];
+
+    // Description
+    const commandDescription = helper.commandDescription(cmd);
+    if (commandDescription.length > 0) {
+      output = output.concat([helper.wrap(commandDescription, helpWidth, 0), '']);
+    }
+
+    // Arguments
+    const argumentList = helper.visibleArguments(cmd).map((argument) => {
+      return formatItem(helper.argumentTerm(argument), helper.argumentDescription(argument));
+    });
+    if (argumentList.length > 0) {
+      output = output.concat(['Arguments:', formatList(argumentList), '']);
+    }
+
+    // Options
+    const optionList = helper.visibleOptions(cmd).map((option) => {
+      return formatItem(helper.optionTerm(option), helper.optionDescription(option));
+    });
+    if (optionList.length > 0) {
+      output = output.concat(['Options:', formatList(optionList), '']);
+    }
+
+    if (this.showGlobalOptions) {
+      const globalOptionList = helper.visibleGlobalOptions(cmd).map((option) => {
+        return formatItem(helper.optionTerm(option), helper.optionDescription(option));
+      });
+      if (globalOptionList.length > 0) {
+        output = output.concat(['Global Options:', formatList(globalOptionList), '']);
+      }
+    }
+
+    // Commands
+    const commandList = helper.visibleCommands(cmd).map((cmd) => {
+      return formatItem(helper.subcommandTerm(cmd), helper.subcommandDescription(cmd));
+    });
+    if (commandList.length > 0) {
+      output = output.concat(['Commands:', formatList(commandList), '']);
+    }
+
+    return output.join('\n');
+  }
+
+  /**
+   * Calculate the pad width from the maximum term length.
+   *
+   * @param {Command} cmd
+   * @param {Help} helper
+   * @returns {number}
+   */
+
+  padWidth(cmd, helper) {
+    return Math.max(
+      helper.longestOptionTermLength(cmd, helper),
+      helper.longestGlobalOptionTermLength(cmd, helper),
+      helper.longestSubcommandTermLength(cmd, helper),
+      helper.longestArgumentTermLength(cmd, helper)
+    );
+  }
+
+  /**
+   * Wrap the given string to width characters per line, with lines after the first indented.
+   * Do not wrap if insufficient room for wrapping (minColumnWidth), or string is manually formatted.
+   *
+   * @param {string} str
+   * @param {number} width
+   * @param {number} indent
+   * @param {number} [minColumnWidth=40]
+   * @return {string}
+   *
+   */
+
+  wrap(str, width, indent, minColumnWidth = 40) {
+    // Full \s characters, minus the linefeeds.
+    const indents = ' \\f\\t\\v\u00a0\u1680\u2000-\u200a\u202f\u205f\u3000\ufeff';
+    // Detect manually wrapped and indented strings by searching for line break followed by spaces.
+    const manualIndent = new RegExp(`[\\n][${indents}]+`);
+    if (str.match(manualIndent)) return str;
+    // Do not wrap if not enough room for a wrapped column of text (as could end up with a word per line).
+    const columnWidth = width - indent;
+    if (columnWidth < minColumnWidth) return str;
+
+    const leadingStr = str.slice(0, indent);
+    const columnText = str.slice(indent).replace('\r\n', '\n');
+    const indentString = ' '.repeat(indent);
+    const zeroWidthSpace = '\u200B';
+    const breaks = `\\s${zeroWidthSpace}`;
+    // Match line end (so empty lines don't collapse),
+    // or as much text as will fit in column, or excess text up to first break.
+    const regex = new RegExp(`\n|.{1,${columnWidth - 1}}([${breaks}]|$)|[^${breaks}]+?([${breaks}]|$)`, 'g');
+    const lines = columnText.match(regex) || [];
+    return leadingStr + lines.map((line, i) => {
+      if (line === '\n') return ''; // preserve empty lines
+      return ((i > 0) ? indentString : '') + line.trimEnd();
+    }).join('\n');
+  }
+}
+
+exports.Help = Help;

backend/frontend/node_modules/webpack-cli/node_modules/commander/lib/option.js

@@ -0,0 +1,331 @@
+const { InvalidArgumentError } = require('./error.js');
+
+// @ts-check
+
+class Option {
+  /**
+   * Initialize a new `Option` with the given `flags` and `description`.
+   *
+   * @param {string} flags
+   * @param {string} [description]
+   */
+
+  constructor(flags, description) {
+    this.flags = flags;
+    this.description = description || '';
+
+    this.required = flags.includes('<'); // A value must be supplied when the option is specified.
+    this.optional = flags.includes('['); // A value is optional when the option is specified.
+    // variadic test ignores <value,...> et al which might be used to describe custom splitting of single argument
+    this.variadic = /\w\.\.\.[>\]]$/.test(flags); // The option can take multiple values.
+    this.mandatory = false; // The option must have a value after parsing, which usually means it must be specified on command line.
+    const optionFlags = splitOptionFlags(flags);
+    this.short = optionFlags.shortFlag;
+    this.long = optionFlags.longFlag;
+    this.negate = false;
+    if (this.long) {
+      this.negate = this.long.startsWith('--no-');
+    }
+    this.defaultValue = undefined;
+    this.defaultValueDescription = undefined;
+    this.presetArg = undefined;
+    this.envVar = undefined;
+    this.parseArg = undefined;
+    this.hidden = false;
+    this.argChoices = undefined;
+    this.conflictsWith = [];
+    this.implied = undefined;
+  }
+
+  /**
+   * Set the default value, and optionally supply the description to be displayed in the help.
+   *
+   * @param {any} value
+   * @param {string} [description]
+   * @return {Option}
+   */
+
+  default(value, description) {
+    this.defaultValue = value;
+    this.defaultValueDescription = description;
+    return this;
+  }
+
+  /**
+   * Preset to use when option used without option-argument, especially optional but also boolean and negated.
+   * The custom processing (parseArg) is called.
+   *
+   * @example
+   * new Option('--color').default('GREYSCALE').preset('RGB');
+   * new Option('--donate [amount]').preset('20').argParser(parseFloat);
+   *
+   * @param {any} arg
+   * @return {Option}
+   */
+
+  preset(arg) {
+    this.presetArg = arg;
+    return this;
+  }
+
+  /**
+   * Add option name(s) that conflict with this option.
+   * An error will be displayed if conflicting options are found during parsing.
+   *
+   * @example
+   * new Option('--rgb').conflicts('cmyk');
+   * new Option('--js').conflicts(['ts', 'jsx']);
+   *
+   * @param {string | string[]} names
+   * @return {Option}
+   */
+
+  conflicts(names) {
+    this.conflictsWith = this.conflictsWith.concat(names);
+    return this;
+  }
+
+  /**
+   * Specify implied option values for when this option is set and the implied options are not.
+   *
+   * The custom processing (parseArg) is not called on the implied values.
+   *
+   * @example
+   * program
+   *   .addOption(new Option('--log', 'write logging information to file'))
+   *   .addOption(new Option('--trace', 'log extra details').implies({ log: 'trace.txt' }));
+   *
+   * @param {Object} impliedOptionValues
+   * @return {Option}
+   */
+  implies(impliedOptionValues) {
+    let newImplied = impliedOptionValues;
+    if (typeof impliedOptionValues === 'string') {
+      // string is not documented, but easy mistake and we can do what user probably intended.
+      newImplied = { [impliedOptionValues]: true };
+    }
+    this.implied = Object.assign(this.implied || {}, newImplied);
+    return this;
+  }
+
+  /**
+   * Set environment variable to check for option value.
+   *
+   * An environment variable is only used if when processed the current option value is
+   * undefined, or the source of the current value is 'default' or 'config' or 'env'.
+   *
+   * @param {string} name
+   * @return {Option}
+   */
+
+  env(name) {
+    this.envVar = name;
+    return this;
+  }
+
+  /**
+   * Set the custom handler for processing CLI option arguments into option values.
+   *
+   * @param {Function} [fn]
+   * @return {Option}
+   */
+
+  argParser(fn) {
+    this.parseArg = fn;
+    return this;
+  }
+
+  /**
+   * Whether the option is mandatory and must have a value after parsing.
+   *
+   * @param {boolean} [mandatory=true]
+   * @return {Option}
+   */
+
+  makeOptionMandatory(mandatory = true) {
+    this.mandatory = !!mandatory;
+    return this;
+  }
+
+  /**
+   * Hide option in help.
+   *
+   * @param {boolean} [hide=true]
+   * @return {Option}
+   */
+
+  hideHelp(hide = true) {
+    this.hidden = !!hide;
+    return this;
+  }
+
+  /**
+   * @api private
+   */
+
+  _concatValue(value, previous) {
+    if (previous === this.defaultValue || !Array.isArray(previous)) {
+      return [value];
+    }
+
+    return previous.concat(value);
+  }
+
+  /**
+   * Only allow option value to be one of choices.
+   *
+   * @param {string[]} values
+   * @return {Option}
+   */
+
+  choices(values) {
+    this.argChoices = values.slice();
+    this.parseArg = (arg, previous) => {
+      if (!this.argChoices.includes(arg)) {
+        throw new InvalidArgumentError(`Allowed choices are ${this.argChoices.join(', ')}.`);
+      }
+      if (this.variadic) {
+        return this._concatValue(arg, previous);
+      }
+      return arg;
+    };
+    return this;
+  }
+
+  /**
+   * Return option name.
+   *
+   * @return {string}
+   */
+
+  name() {
+    if (this.long) {
+      return this.long.replace(/^--/, '');
+    }
+    return this.short.replace(/^-/, '');
+  }
+
+  /**
+   * Return option name, in a camelcase format that can be used
+   * as a object attribute key.
+   *
+   * @return {string}
+   * @api private
+   */
+
+  attributeName() {
+    return camelcase(this.name().replace(/^no-/, ''));
+  }
+
+  /**
+   * Check if `arg` matches the short or long flag.
+   *
+   * @param {string} arg
+   * @return {boolean}
+   * @api private
+   */
+
+  is(arg) {
+    return this.short === arg || this.long === arg;
+  }
+
+  /**
+   * Return whether a boolean option.
+   *
+   * Options are one of boolean, negated, required argument, or optional argument.
+   *
+   * @return {boolean}
+   * @api private
+   */
+
+  isBoolean() {
+    return !this.required && !this.optional && !this.negate;
+  }
+}
+
+/**
+ * This class is to make it easier to work with dual options, without changing the existing
+ * implementation. We support separate dual options for separate positive and negative options,
+ * like `--build` and `--no-build`, which share a single option value. This works nicely for some
+ * use cases, but is tricky for others where we want separate behaviours despite
+ * the single shared option value.
+ */
+class DualOptions {
+  /**
+   * @param {Option[]} options
+   */
+  constructor(options) {
+    this.positiveOptions = new Map();
+    this.negativeOptions = new Map();
+    this.dualOptions = new Set();
+    options.forEach(option => {
+      if (option.negate) {
+        this.negativeOptions.set(option.attributeName(), option);
+      } else {
+        this.positiveOptions.set(option.attributeName(), option);
+      }
+    });
+    this.negativeOptions.forEach((value, key) => {
+      if (this.positiveOptions.has(key)) {
+        this.dualOptions.add(key);
+      }
+    });
+  }
+
+  /**
+   * Did the value come from the option, and not from possible matching dual option?
+   *
+   * @param {any} value
+   * @param {Option} option
+   * @returns {boolean}
+   */
+  valueFromOption(value, option) {
+    const optionKey = option.attributeName();
+    if (!this.dualOptions.has(optionKey)) return true;
+
+    // Use the value to deduce if (probably) came from the option.
+    const preset = this.negativeOptions.get(optionKey).presetArg;
+    const negativeValue = (preset !== undefined) ? preset : false;
+    return option.negate === (negativeValue === value);
+  }
+}
+
+/**
+ * Convert string from kebab-case to camelCase.
+ *
+ * @param {string} str
+ * @return {string}
+ * @api private
+ */
+
+function camelcase(str) {
+  return str.split('-').reduce((str, word) => {
+    return str + word[0].toUpperCase() + word.slice(1);
+  });
+}
+
+/**
+ * Split the short and long flag out of something like '-m,--mixed <value>'
+ *
+ * @api private
+ */
+
+function splitOptionFlags(flags) {
+  let shortFlag;
+  let longFlag;
+  // Use original very loose parsing to maintain backwards compatibility for now,
+  // which allowed for example unintended `-sw, --short-word` [sic].
+  const flagParts = flags.split(/[ |,]+/);
+  if (flagParts.length > 1 && !/^[[<]/.test(flagParts[1])) shortFlag = flagParts.shift();
+  longFlag = flagParts.shift();
+  // Add support for lone short flag without significantly changing parsing!
+  if (!shortFlag && /^-[^-]$/.test(longFlag)) {
+    shortFlag = longFlag;
+    longFlag = undefined;
+  }
+  return { shortFlag, longFlag };
+}
+
+exports.Option = Option;
+exports.splitOptionFlags = splitOptionFlags;
+exports.DualOptions = DualOptions;

backend/frontend/node_modules/webpack-cli/node_modules/commander/lib/suggestSimilar.js

@@ -0,0 +1,100 @@
+const maxDistance = 3;
+
+function editDistance(a, b) {
+  // https://en.wikipedia.org/wiki/Damerau–Levenshtein_distance
+  // Calculating optimal string alignment distance, no substring is edited more than once.
+  // (Simple implementation.)
+
+  // Quick early exit, return worst case.
+  if (Math.abs(a.length - b.length) > maxDistance) return Math.max(a.length, b.length);
+
+  // distance between prefix substrings of a and b
+  const d = [];
+
+  // pure deletions turn a into empty string
+  for (let i = 0; i <= a.length; i++) {
+    d[i] = [i];
+  }
+  // pure insertions turn empty string into b
+  for (let j = 0; j <= b.length; j++) {
+    d[0][j] = j;
+  }
+
+  // fill matrix
+  for (let j = 1; j <= b.length; j++) {
+    for (let i = 1; i <= a.length; i++) {
+      let cost = 1;
+      if (a[i - 1] === b[j - 1]) {
+        cost = 0;
+      } else {
+        cost = 1;
+      }
+      d[i][j] = Math.min(
+        d[i - 1][j] + 1, // deletion
+        d[i][j - 1] + 1, // insertion
+        d[i - 1][j - 1] + cost // substitution
+      );
+      // transposition
+      if (i > 1 && j > 1 && a[i - 1] === b[j - 2] && a[i - 2] === b[j - 1]) {
+        d[i][j] = Math.min(d[i][j], d[i - 2][j - 2] + 1);
+      }
+    }
+  }
+
+  return d[a.length][b.length];
+}
+
+/**
+ * Find close matches, restricted to same number of edits.
+ *
+ * @param {string} word
+ * @param {string[]} candidates
+ * @returns {string}
+ */
+
+function suggestSimilar(word, candidates) {
+  if (!candidates || candidates.length === 0) return '';
+  // remove possible duplicates
+  candidates = Array.from(new Set(candidates));
+
+  const searchingOptions = word.startsWith('--');
+  if (searchingOptions) {
+    word = word.slice(2);
+    candidates = candidates.map(candidate => candidate.slice(2));
+  }
+
+  let similar = [];
+  let bestDistance = maxDistance;
+  const minSimilarity = 0.4;
+  candidates.forEach((candidate) => {
+    if (candidate.length <= 1) return; // no one character guesses
+
+    const distance = editDistance(word, candidate);
+    const length = Math.max(word.length, candidate.length);
+    const similarity = (length - distance) / length;
+    if (similarity > minSimilarity) {
+      if (distance < bestDistance) {
+        // better edit distance, throw away previous worse matches
+        bestDistance = distance;
+        similar = [candidate];
+      } else if (distance === bestDistance) {
+        similar.push(candidate);
+      }
+    }
+  });
+
+  similar.sort((a, b) => a.localeCompare(b));
+  if (searchingOptions) {
+    similar = similar.map(candidate => `--${candidate}`);
+  }
+
+  if (similar.length > 1) {
+    return `\n(Did you mean one of ${similar.join(', ')}?)`;
+  }
+  if (similar.length === 1) {
+    return `\n(Did you mean ${similar[0]}?)`;
+  }
+  return '';
+}
+
+exports.suggestSimilar = suggestSimilar;