文件操作 - symbol-constructor-detection.js
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文件: /usr/share/nodejs/core-js/internals/symbol-constructor-detection.js
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/* eslint-disable es/no-symbol -- required for testing */ var V8_VERSION = require('../internals/engine-v8-version'); var fails = require('../internals/fails'); // eslint-disable-next-line es/no-object-getownpropertysymbols -- required for testing module.exports = !!Object.getOwnPropertySymbols && !fails(function () { var symbol = Symbol(); // Chrome 38 Symbol has incorrect toString conversion // `get-own-property-symbols` polyfill symbols converted to object are not Symbol instances return !String(symbol) || !(Object(symbol) instanceof Symbol) || // Chrome 38-40 symbols are not inherited from DOM collections prototypes to instances !Symbol.sham && V8_VERSION && V8_VERSION < 41; });
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