RAHHH

backend/frontend/node_modules/tcomb/lib/mixin.js

@@ -0,0 +1,18 @@
+var isNil = require('./isNil');
+var assert = require('./assert');
+
+// safe mixin, cannot override props unless specified
+module.exports = function mixin(target, source, overwrite) {
+  if (isNil(source)) { return target; }
+  for (var k in source) {
+    if (source.hasOwnProperty(k)) {
+      if (overwrite !== true) {
+        if (process.env.NODE_ENV !== 'production') {
+          assert(!target.hasOwnProperty(k) || target[k] === source[k], function () { return 'Invalid call to mixin(target, source, [overwrite]): cannot overwrite property "' + k + '" of target object'; });
+        }
+      }
+      target[k] = source[k];
+    }
+  }
+  return target;
+};