.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 isCallable = require('../internals/is-callable');
   4 var create = require('../internals/object-create');
   5 var getPrototypeOf = require('../internals/object-get-prototype-of');
   6 var redefine = require('../internals/redefine');
   7 var wellKnownSymbol = require('../internals/well-known-symbol');
   8 var IS_PURE = require('../internals/is-pure');
   9
  10 var ITERATOR = wellKnownSymbol('iterator');
  11 var BUGGY_SAFARI_ITERATORS = false;
  12
  13 // `%IteratorPrototype%` object
  14 // https://tc39.es/ecma262/#sec-%iteratorprototype%-object
  15 var IteratorPrototype, PrototypeOfArrayIteratorPrototype, arrayIterator;
  16
  17 /* eslint-disable es/no-array-prototype-keys -- safe */
  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 else if (IS_PURE) IteratorPrototype = create(IteratorPrototype);
  36
  37 // `%IteratorPrototype%[@@iterator]()` method
  38 // https://tc39.es/ecma262/#sec-%iteratorprototype%-@@iterator
  39 if (!isCallable(IteratorPrototype[ITERATOR])) {
  40   redefine(IteratorPrototype, ITERATOR, function () {
  41     return this;
  42   });
  43 }
  44
  45 module.exports = {
  46   IteratorPrototype: IteratorPrototype,
  47   BUGGY_SAFARI_ITERATORS: BUGGY_SAFARI_ITERATORS
  48 };