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Viewing file:     _shouldPolyfillES6Collection.js (1.29 KB)      -rw-r--r--

"use strict";

/**
 * Copyright (c) 2013-present, Facebook, Inc.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 * @preventMunge
 * 
 */

/**
 * Checks whether a collection name (e.g. "Map" or "Set") has a native polyfill
 * that is safe to be used.
 */
function shouldPolyfillES6Collection(collectionName) {
  var Collection = global[collectionName];

  if (Collection == null) {
    return true;
  } // The iterator protocol depends on `Symbol.iterator`. If a collection is
  // implemented, but `Symbol` is not, it's going to break iteration because
  // we'll be using custom "@@iterator" instead, which is not implemented on
  // native collections.


  if (typeof global.Symbol !== 'function') {
    return true;
  }

  var proto = Collection.prototype; // These checks are adapted from es6-shim: https://fburl.com/34437854
  // NOTE: `isCallableWithoutNew` and `!supportsSubclassing` are not checked
  // because they make debugging with "break on exceptions" difficult.

  return Collection == null || typeof Collection !== 'function' || typeof proto.clear !== 'function' || new Collection().size !== 0 || typeof proto.keys !== 'function' || typeof proto.forEach !== 'function';
}

module.exports = shouldPolyfillES6Collection;