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node_modules/copy-descriptor/index.js

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+/*!
+ * copy-descriptor <https://github.com/jonschlinkert/copy-descriptor>
+ *
+ * Copyright (c) 2015, Jon Schlinkert.
+ * Licensed under the MIT License.
+ */
+
+'use strict';
+
+/**
+ * Copy a descriptor from one object to another.
+ *
+ * ```js
+ * function App() {
+ *   this.cache = {};
+ * }
+ * App.prototype.set = function(key, val) {
+ *   this.cache[key] = val;
+ *   return this;
+ * };
+ * Object.defineProperty(App.prototype, 'count', {
+ *   get: function() {
+ *     return Object.keys(this.cache).length;
+ *   }
+ * });
+ *
+ * copy(App.prototype, 'count', 'len');
+ *
+ * // create an instance
+ * var app = new App();
+ *
+ * app.set('a', true);
+ * app.set('b', true);
+ * app.set('c', true);
+ *
+ * console.log(app.count);
+ * //=> 3
+ * console.log(app.len);
+ * //=> 3
+ * ```
+ * @name copy
+ * @param {Object} `receiver` The target object
+ * @param {Object} `provider` The provider object
+ * @param {String} `from` The key to copy on provider.
+ * @param {String} `to` Optionally specify a new key name to use.
+ * @return {Object}
+ * @api public
+ */
+
+module.exports = function copyDescriptor(receiver, provider, from, to) {
+  if (!isObject(provider) && typeof provider !== 'function') {
+    to = from;
+    from = provider;
+    provider = receiver;
+  }
+  if (!isObject(receiver) && typeof receiver !== 'function') {
+    throw new TypeError('expected the first argument to be an object');
+  }
+  if (!isObject(provider) && typeof provider !== 'function') {
+    throw new TypeError('expected provider to be an object');
+  }
+
+  if (typeof to !== 'string') {
+    to = from;
+  }
+  if (typeof from !== 'string') {
+    throw new TypeError('expected key to be a string');
+  }
+
+  if (!(from in provider)) {
+    throw new Error('property "' + from + '" does not exist');
+  }
+
+  var val = Object.getOwnPropertyDescriptor(provider, from);
+  if (val) Object.defineProperty(receiver, to, val);
+};
+
+function isObject(val) {
+  return {}.toString.call(val) === '[object Object]';
+}
+