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rOACCT/node_modules/core-js/modules/esnext.async-iterator.reduce.js
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esnext.async-iterator.reduce.js
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			'use strict';
			var $ = require('../internals/export');
			var call = require('../internals/function-call');
			var aCallable = require('../internals/a-callable');
			var anObject = require('../internals/an-object');
			var isObject = require('../internals/is-object');
			var getBuiltIn = require('../internals/get-built-in');
			var getIteratorDirect = require('../internals/get-iterator-direct');
			var closeAsyncIteration = require('../internals/async-iterator-close');

			var Promise = getBuiltIn('Promise');
			var $TypeError = TypeError;

			// `AsyncIterator.prototype.reduce` method
			// https://github.com/tc39/proposal-iterator-helpers
			$({ target: 'AsyncIterator', proto: true, real: true }, {
			reduce: function reduce(reducer /* , initialValue */) {
			var record = getIteratorDirect(this);
			var iterator = record.iterator;
			var next = record.next;
			var noInitial = arguments.length < 2;
			var accumulator = noInitial ? undefined : arguments[1];
			var counter = 0;
			aCallable(reducer);

			return new Promise(function (resolve, reject) {
			var ifAbruptCloseAsyncIterator = function (error) {
			closeAsyncIteration(iterator, reject, error, reject);
			};

			var loop = function () {
			try {
			Promise.resolve(anObject(call(next, iterator))).then(function (step) {
			try {
			if (anObject(step).done) {
			noInitial ? reject($TypeError('Reduce of empty iterator with no initial value')) : resolve(accumulator);
			} else {
			var value = step.value;
			if (noInitial) {
			noInitial = false;
			accumulator = value;
			loop();
			} else try {
			var result = reducer(accumulator, value, counter);

			var handler = function ($result) {
			accumulator = $result;
			loop();
			};

			if (isObject(result)) Promise.resolve(result).then(handler, ifAbruptCloseAsyncIterator);
			else handler(result);
			} catch (error3) { ifAbruptCloseAsyncIterator(error3); }
			}
			counter++;
			} catch (error2) { reject(error2); }
			}, reject);
			} catch (error) { reject(error); }
			};

			loop();
			});
			}
			});