文件操作 - add-to-unscopables.js
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文件: /usr/share/nodejs/core-js/internals/add-to-unscopables.js
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var wellKnownSymbol = require('../internals/well-known-symbol'); var create = require('../internals/object-create'); var defineProperty = require('../internals/object-define-property').f; var UNSCOPABLES = wellKnownSymbol('unscopables'); var ArrayPrototype = Array.prototype; // Array.prototype[@@unscopables] // https://tc39.es/ecma262/#sec-array.prototype-@@unscopables if (ArrayPrototype[UNSCOPABLES] == undefined) { defineProperty(ArrayPrototype, UNSCOPABLES, { configurable: true, value: create(null) }); } // add a key to Array.prototype[@@unscopables] module.exports = function (key) { ArrayPrototype[UNSCOPABLES][key] = true; };
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