SyncWaterfallHook.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 SyncWaterfallHookCodeFactory extends HookCodeFactory {
	content({ onError, onResult, resultReturns, rethrowIfPossible }) {
	return this.callTapsSeries({
	onError: (i, err) => onError(err),
	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]),
	doneReturns: resultReturns,
	rethrowIfPossible
	});
	}
	}

	const factory = new SyncWaterfallHookCodeFactory();

	const TAP_ASYNC = () => {
	throw new Error("tapAsync is not supported on a SyncWaterfallHook");
	};

	const TAP_PROMISE = () => {
	throw new Error("tapPromise is not supported on a SyncWaterfallHook");
	};

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

	function SyncWaterfallHook(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 = SyncWaterfallHook;
	hook.tapAsync = TAP_ASYNC;
	hook.tapPromise = TAP_PROMISE;
	hook.compile = COMPILE;
	return hook;
	}

	SyncWaterfallHook.prototype = null;

	module.exports = SyncWaterfallHook;