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- var global = require('../internals/global');
- var shared = require('../internals/shared');
- var hasOwn = require('../internals/has-own-property');
- 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 symbolFor = Symbol && Symbol['for'];
- var createWellKnownSymbol = USE_SYMBOL_AS_UID ? Symbol : Symbol && Symbol.withoutSetter || uid;
- module.exports = function (name) {
- if (!hasOwn(WellKnownSymbolsStore, name) || !(NATIVE_SYMBOL || typeof WellKnownSymbolsStore[name] == 'string')) {
- var description = 'Symbol.' + name;
- if (NATIVE_SYMBOL && hasOwn(Symbol, name)) {
- WellKnownSymbolsStore[name] = Symbol[name];
- } else if (USE_SYMBOL_AS_UID && symbolFor) {
- WellKnownSymbolsStore[name] = symbolFor(description);
- } else {
- WellKnownSymbolsStore[name] = createWellKnownSymbol(description);
- }
- } return WellKnownSymbolsStore[name];
- };
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