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• well-known-symbol.js

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package.internals.well-known-symbol.js Maven / Gradle / Ivy

'use strict';
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/symbol-constructor-detection');
var USE_SYMBOL_AS_UID = require('../internals/use-symbol-as-uid');

var Symbol = global.Symbol;
var WellKnownSymbolsStore = shared('wks');
var createWellKnownSymbol = USE_SYMBOL_AS_UID ? Symbol['for'] || Symbol : Symbol && Symbol.withoutSetter || uid;

module.exports = function (name) {
  if (!hasOwn(WellKnownSymbolsStore, name)) {
    WellKnownSymbolsStore[name] = NATIVE_SYMBOL && hasOwn(Symbol, name)
      ? Symbol[name]
      : createWellKnownSymbol('Symbol.' + name);
  } return WellKnownSymbolsStore[name];
};