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

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