文件操作 - well-known-symbol.js
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文件: /node_modules/core-js/internals/well-known-symbol.js
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var global = require('../internals/global'); var shared = require('../internals/shared'); var has = require('../internals/has'); var uid = require('../internals/uid'); var NATIVE_SYMBOL = require('../internals/native-symbol'); var USE_SYMBOL_AS_UID = require('../internals/use-symbol-as-uid'); var WellKnownSymbolsStore = shared('wks'); var Symbol = global.Symbol; var createWellKnownSymbol = USE_SYMBOL_AS_UID ? Symbol : Symbol && Symbol.withoutSetter || uid; module.exports = function (name) { if (!has(WellKnownSymbolsStore, name)) { if (NATIVE_SYMBOL && has(Symbol, name)) WellKnownSymbolsStore[name] = Symbol[name]; else WellKnownSymbolsStore[name] = createWellKnownSymbol('Symbol.' + name); } return WellKnownSymbolsStore[name]; };
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