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rOACCT/node_modules/core-js/internals/async-iterator-create-proxy.js
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async-iterator-create-proxy.js
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			'use strict';
			var call = require('../internals/function-call');
			var perform = require('../internals/perform');
			var anObject = require('../internals/an-object');
			var create = require('../internals/object-create');
			var createNonEnumerableProperty = require('../internals/create-non-enumerable-property');
			var defineBuiltIns = require('../internals/define-built-ins');
			var wellKnownSymbol = require('../internals/well-known-symbol');
			var InternalStateModule = require('../internals/internal-state');
			var getBuiltIn = require('../internals/get-built-in');
			var getMethod = require('../internals/get-method');
			var AsyncIteratorPrototype = require('../internals/async-iterator-prototype');
			var createIterResultObject = require('../internals/create-iter-result-object');
			var iteratorClose = require('../internals/iterator-close');

			var Promise = getBuiltIn('Promise');

			var ASYNC_ITERATOR_HELPER = 'AsyncIteratorHelper';
			var WRAP_FOR_VALID_ASYNC_ITERATOR = 'WrapForValidAsyncIterator';
			var setInternalState = InternalStateModule.set;

			var TO_STRING_TAG = wellKnownSymbol('toStringTag');

			var createAsyncIteratorProxyPrototype = function (IS_ITERATOR) {
			var IS_GENERATOR = !IS_ITERATOR;
			var ASYNC_ITERATOR_PROXY = IS_ITERATOR ? WRAP_FOR_VALID_ASYNC_ITERATOR : ASYNC_ITERATOR_HELPER;

			var getInternalState = InternalStateModule.getterFor(ASYNC_ITERATOR_PROXY);

			var getStateOrEarlyExit = function (that) {
			var stateCompletion = perform(function () {
			return getInternalState(that);
			});

			var stateError = stateCompletion.error;
			var state = stateCompletion.value;

			if (stateError \|\| (IS_GENERATOR && state.done)) {
			return { exit: true, value: stateError ? Promise.reject(state) : Promise.resolve(createIterResultObject(undefined, true)) };
			} return { exit: false, value: state };
			};

			var enqueue = function (state, handler) {
			var task = function () {
			var promise = handler();
			if (IS_GENERATOR) {
			state.awaiting = promise;
			var clean = function () {
			if (state.awaiting === promise) state.awaiting = null;
			};
			promise.then(clean, clean);
			} return promise;
			};

			return state.awaiting ? state.awaiting = state.awaiting.then(task, task) : task();
			};

			var AsyncIteratorProxyPrototype = defineBuiltIns(create(AsyncIteratorPrototype), {
			next: function next() {
			var stateCompletion = getStateOrEarlyExit(this);
			var exit = stateCompletion.exit;
			var state = stateCompletion.value;

			return exit ? state : enqueue(state, function () {
			var handlerCompletion = perform(function () {
			return anObject(state.nextHandler(Promise));
			});
			var handlerError = handlerCompletion.error;
			var value = handlerCompletion.value;
			if (handlerError) state.done = true;
			return handlerError ? Promise.reject(value) : Promise.resolve(value);
			});
			},
			'return': function () {
			var stateCompletion = getStateOrEarlyExit(this);
			var exit = stateCompletion.exit;
			var state = stateCompletion.value;

			return exit ? state : enqueue(state, function () {
			state.done = true;
			var iterator = state.iterator;
			var returnMethod, result;
			var completion = perform(function () {
			if (state.inner) try {
			iteratorClose(state.inner.iterator, 'return');
			} catch (error) {
			return iteratorClose(iterator, 'throw', error);
			}
			return getMethod(iterator, 'return');
			});
			returnMethod = result = completion.value;
			if (completion.error) return Promise.reject(result);
			if (returnMethod === undefined) return Promise.resolve(createIterResultObject(undefined, true));
			completion = perform(function () {
			return call(returnMethod, iterator);
			});
			result = completion.value;
			if (completion.error) return Promise.reject(result);
			return IS_ITERATOR ? Promise.resolve(result) : Promise.resolve(result).then(function (resolved) {
			anObject(resolved);
			return createIterResultObject(undefined, true);
			});
			});
			}
			});

			if (IS_GENERATOR) {
			createNonEnumerableProperty(AsyncIteratorProxyPrototype, TO_STRING_TAG, 'Async Iterator Helper');
			}

			return AsyncIteratorProxyPrototype;
			};

			var AsyncIteratorHelperPrototype = createAsyncIteratorProxyPrototype(false);
			var WrapForValidAsyncIteratorPrototype = createAsyncIteratorProxyPrototype(true);

			module.exports = function (nextHandler, IS_ITERATOR) {
			var ASYNC_ITERATOR_PROXY = IS_ITERATOR ? WRAP_FOR_VALID_ASYNC_ITERATOR : ASYNC_ITERATOR_HELPER;

			var AsyncIteratorProxy = function AsyncIterator(record, state) {
			if (state) {
			state.iterator = record.iterator;
			state.next = record.next;
			} else state = record;
			state.type = ASYNC_ITERATOR_PROXY;
			state.nextHandler = nextHandler;
			state.counter = 0;
			state.done = false;
			state.awaiting = null;
			setInternalState(this, state);
			};

			AsyncIteratorProxy.prototype = IS_ITERATOR ? WrapForValidAsyncIteratorPrototype : AsyncIteratorHelperPrototype;

			return AsyncIteratorProxy;
			};