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Move Add-on SDK source to toolkit/jetpack

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NTD 2018-02-09 06:46:43 -05:00 • committed by Roy Tam
commit 23b67db438
993 changed files with 484 additions and 100663 deletions
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29
addon-sdk/source/lib/sdk/core/reference.js
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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
"use strict";
module.metadata = {
"stability": "experimental"
};
const method = require("../../method/core");
const { Class } = require("./heritage");
// Object that inherit or mix WeakRefence inn will register
// weak observes for system notifications.
const WeakReference = Class({});
exports.WeakReference = WeakReference;
// If `isWeak(object)` is `true` observer installed
// for such `object` will be weak, meaning that it will
// be GC-ed if nothing else but observer is observing it.
// By default everything except `WeakReference` will return
// `false`.
const isWeak = method("reference/weak?");
exports.isWeak = isWeak;
isWeak.define(Object, _ => false);
isWeak.define(WeakReference, _ => true);