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'use strict';
var aFunction = require('../internals/a-function');
var anObject = require('../internals/an-object');
var create = require('../internals/object-create');
var createNonEnumerableProperty = require('../internals/create-non-enumerable-property');
var redefineAll = require('../internals/redefine-all');
var wellKnownSymbol = require('../internals/well-known-symbol');
var InternalStateModule = require('../internals/internal-state');
var getBuiltIn = require('../internals/get-built-in');
var AsyncIteratorPrototype = require('../internals/async-iterator-prototype');

var Promise = getBuiltIn('Promise');

var setInternalState = InternalStateModule.set;
var getInternalState = InternalStateModule.get;

var TO_STRING_TAG = wellKnownSymbol('toStringTag');

module.exports = function (nextHandler, IS_ITERATOR) {
  var AsyncIteratorProxy = function AsyncIterator(state) {
    state.next = aFunction(state.iterator.next);
    state.done = false;
    state.ignoreArgument = !IS_ITERATOR;
    setInternalState(this, state);
  };

  AsyncIteratorProxy.prototype = redefineAll(create(AsyncIteratorPrototype), {
    next: function next(arg) {
      var that = this;
      var hasArgument = !!arguments.length;
      return new Promise(function (resolve) {
        var state = getInternalState(that);
        var args = hasArgument ? [state.ignoreArgument ? undefined : arg] : IS_ITERATOR ? [] : [undefined];
        state.ignoreArgument = false;
        resolve(state.done ? { done: true, value: undefined } : anObject(nextHandler.call(state, Promise, args)));
      });
    },
    'return': function (value) {
      var that = this;
      return new Promise(function (resolve, reject) {
        var state = getInternalState(that);
        var iterator = state.iterator;
        state.done = true;
        var $$return = iterator['return'];
        if ($$return === undefined) return resolve({ done: true, value: value });
        Promise.resolve($$return.call(iterator, value)).then(function (result) {
          anObject(result);
          resolve({ done: true, value: value });
        }, reject);
      });
    },
    'throw': function (value) {
      var that = this;
      return new Promise(function (resolve, reject) {
        var state = getInternalState(that);
        var iterator = state.iterator;
        state.done = true;
        var $$throw = iterator['throw'];
        if ($$throw === undefined) return reject(value);
        resolve($$throw.call(iterator, value));
      });
    }
  });

  if (!IS_ITERATOR) {
    createNonEnumerableProperty(AsyncIteratorProxy.prototype, TO_STRING_TAG, 'Generator');
  }

  return AsyncIteratorProxy;
};