is-native-implemented.js 275 B

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  1. // Exports true if environment provides native `WeakMap` implementation, whatever that is.
  2. 'use strict';
  3. module.exports = (function () {
  4. if (typeof WeakMap !== 'function') return false;
  5. return (Object.prototype.toString.call(new WeakMap()) === '[object WeakMap]');
  6. }());