.config/coc/extensions/node_modules/coc-prettier/node_modules/core-js/modules/esnext.async-iterator.from.js

   1 // https://github.com/tc39/proposal-iterator-helpers
   2 var $ = require('../internals/export');
   3 var apply = require('../internals/function-apply');
   4 var anObject = require('../internals/an-object');
   5 var toObject = require('../internals/to-object');
   6 var isPrototypeOf = require('../internals/object-is-prototype-of');
   7 var AsyncIteratorPrototype = require('../internals/async-iterator-prototype');
   8 var createAsyncIteratorProxy = require('../internals/async-iterator-create-proxy');
   9 var getAsyncIterator = require('../internals/get-async-iterator');
  10 var getIterator = require('../internals/get-iterator');
  11 var getIteratorMethod = require('../internals/get-iterator-method');
  12 var getMethod = require('../internals/get-method');
  13 var wellKnownSymbol = require('../internals/well-known-symbol');
  14 var AsyncFromSyncIterator = require('../internals/async-from-sync-iterator');
  15
  16 var ASYNC_ITERATOR = wellKnownSymbol('asyncIterator');
  17
  18 var AsyncIteratorProxy = createAsyncIteratorProxy(function (Promise, args) {
  19   return anObject(apply(this.next, this.iterator, args));
  20 }, true);
  21
  22 $({ target: 'AsyncIterator', stat: true }, {
  23   from: function from(O) {
  24     var object = toObject(O);
  25     var usingIterator = getMethod(object, ASYNC_ITERATOR);
  26     var iterator;
  27     if (usingIterator) {
  28       iterator = getAsyncIterator(object, usingIterator);
  29       if (isPrototypeOf(AsyncIteratorPrototype, iterator)) return iterator;
  30     }
  31     if (iterator === undefined) {
  32       usingIterator = getIteratorMethod(object);
  33       if (usingIterator) return new AsyncFromSyncIterator(getIterator(object, usingIterator));
  34     }
  35     return new AsyncIteratorProxy({ iterator: iterator !== undefined ? iterator : object });
  36   }
  37 });