зеркало из https://github.com/mozilla/gecko-dev.git
50 строки
1.5 KiB
JavaScript
50 строки
1.5 KiB
JavaScript
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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"use strict";
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this.EXPORTED_SYMBOLS = ["FxAccountsUtils"];
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this.FxAccountsUtils = Object.freeze({
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/**
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* Copies properties from a given object to another object.
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*
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* @param from (object)
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* The object we read property descriptors from.
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* @param to (object)
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* The object that we set property descriptors on.
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* @param options (object) (optional)
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* {keys: [...]}
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* Lets the caller pass the names of all properties they want to be
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* copied. Will copy all properties of the given source object by
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* default.
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* {bind: object}
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* Lets the caller specify the object that will be used to .bind()
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* all function properties we find to. Will bind to the given target
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* object by default.
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*/
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copyObjectProperties: function (from, to, opts = {}) {
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let keys = (opts && opts.keys) || Object.keys(from);
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let thisArg = (opts && opts.bind) || to;
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for (let prop of keys) {
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let desc = Object.getOwnPropertyDescriptor(from, prop);
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if (typeof(desc.value) == "function") {
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desc.value = desc.value.bind(thisArg);
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}
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if (desc.get) {
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desc.get = desc.get.bind(thisArg);
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}
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if (desc.set) {
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desc.set = desc.set.bind(thisArg);
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}
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Object.defineProperty(to, prop, desc);
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}
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}
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});
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