PrivateFieldAccessor

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PrivateFieldAccessor

object with initialValue storing a weak reference to create private fields

当前为 2019-10-26 提交的版本，查看最新版本。

此脚本不应直接安装。它是供其他脚本使用的外部库，要使用该库请加入元指令 // @require https://update.greasyfork.icu/scripts/391608/744027/PrivateFieldAccessor.js

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换行

// ==UserScript==
// @name         PrivateFieldAccessor
// @namespace    hoehleg.userscripts.private
// @version      0.1
// @description  object with initialValue storing a weak reference to create private fields
// @author       Gerrit Höhle
// @grant        none
// ==/UserScript==

/* jshint esversion: 6 */
const PrivateFieldAccessor = (() => {

    'use strict';
    return class PrivateFieldAccessor {

        constructor(initialValue) {
            this._privateData = new WeakMap();
            this._initialValue = initialValue;
        }

        init(object, initialValue = this._initialValue) {
            this._initialValue = (typeof initialValue === "function") ? initialValue() : initialValue;
            this.set(object, this._initialValue);
            return this._initialValue;
        }

        get(object) {
            const p = this._privateData.get(object);
            return p ? p.value : this.init(object);
        }

        set(object, value) {
            this._privateData.set(object, { value: this._initialValue });
        }
    };
})();