AsyncSeriesWaterfallHook.js
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AsyncSeriesWaterfallHook.js
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			/*
			MIT License http://www.opensource.org/licenses/mit-license.php
			Author Tobias Koppers @sokra
			*/
			"use strict";

			const Hook = require("./Hook");
			const HookCodeFactory = require("./HookCodeFactory");

			class AsyncSeriesWaterfallHookCodeFactory extends HookCodeFactory {
			content({ onError, onResult, onDone }) {
			return this.callTapsSeries({
			onError: (i, err, next, doneBreak) => onError(err) + doneBreak(true),
			onResult: (i, result, next) => {
			let code = "";
			code += `if(${result} !== undefined) {\n`;
			code += `${this._args[0]} = ${result};\n`;
			code += `}\n`;
			code += next();
			return code;
			},
			onDone: () => onResult(this._args[0])
			});
			}
			}

			const factory = new AsyncSeriesWaterfallHookCodeFactory();

			const COMPILE = function(options) {
			factory.setup(this, options);
			return factory.create(options);
			};

			function AsyncSeriesWaterfallHook(args = [], name = undefined) {
			if (args.length < 1)
			throw new Error("Waterfall hooks must have at least one argument");
			const hook = new Hook(args, name);
			hook.constructor = AsyncSeriesWaterfallHook;
			hook.compile = COMPILE;
			hook._call = undefined;
			hook.call = undefined;
			return hook;
			}

			AsyncSeriesWaterfallHook.prototype = null;

			module.exports = AsyncSeriesWaterfallHook;