.config/coc/extensions/node_modules/coc-prettier/node_modules/core-js/internals/iterators-core.js

   1 'use strict';
   2 var fails = require('../internals/fails');
   3 var getPrototypeOf = require('../internals/object-get-prototype-of');
   4 var createNonEnumerableProperty = require('../internals/create-non-enumerable-property');
   5 var has = require('../internals/has');
   6 var wellKnownSymbol = require('../internals/well-known-symbol');
   7 var IS_PURE = require('../internals/is-pure');
   8
   9 var ITERATOR = wellKnownSymbol('iterator');
  10 var BUGGY_SAFARI_ITERATORS = false;
  11
  12 var returnThis = function () { return this; };
  13
  14 // `%IteratorPrototype%` object
  15 // https://tc39.es/ecma262/#sec-%iteratorprototype%-object
  16 var IteratorPrototype, PrototypeOfArrayIteratorPrototype, arrayIterator;
  17
  18 if ([].keys) {
  19   arrayIterator = [].keys();
  20   // Safari 8 has buggy iterators w/o `next`
  21   if (!('next' in arrayIterator)) BUGGY_SAFARI_ITERATORS = true;
  22   else {
  23     PrototypeOfArrayIteratorPrototype = getPrototypeOf(getPrototypeOf(arrayIterator));
  24     if (PrototypeOfArrayIteratorPrototype !== Object.prototype) IteratorPrototype = PrototypeOfArrayIteratorPrototype;
  25   }
  26 }
  27
  28 var NEW_ITERATOR_PROTOTYPE = IteratorPrototype == undefined || fails(function () {
  29   var test = {};
  30   // FF44- legacy iterators case
  31   return IteratorPrototype[ITERATOR].call(test) !== test;
  32 });
  33
  34 if (NEW_ITERATOR_PROTOTYPE) IteratorPrototype = {};
  35
  36 // 25.1.2.1.1 %IteratorPrototype%[@@iterator]()
  37 if ((!IS_PURE || NEW_ITERATOR_PROTOTYPE) && !has(IteratorPrototype, ITERATOR)) {
  38   createNonEnumerableProperty(IteratorPrototype, ITERATOR, returnThis);
  39 }
  40
  41 module.exports = {
  42   IteratorPrototype: IteratorPrototype,
  43   BUGGY_SAFARI_ITERATORS: BUGGY_SAFARI_ITERATORS
  44 };