Reorganize task() and add another method for it

index.js

@@ -1,10 +1,16 @@
 import {EventEmitter2} from 'eventemitter2';
 
+import * as tasks from './task';
+
 export const emitter = new EventEmitter2();
 
 const gupp = {
-	task(name, cb) {
-		emitter.on(`tasks.${name}`, cb);
+	task(name, cb, cb1) {
+		if (Array.isArray(cb)) {
+			tasks.taskDepsCb(name, cb, cb1);
+		} else if (cb instanceof Function) {
+			tasks.taskCb(name, cb);
+		}
 	}
 };
 

task.js

@@ -0,0 +1,16 @@
+/*
+ * Manages tasks. Provides various gupp.task's.
+ */
+import {emitter} from '.';
+
+export function taskCb(name, cb) {
+	emitter.on(`tasks.${name}`, cb);
+}
+
+export function taskDepsCb(name, deps, cb) {
+	deps.forEach(dep => {
+		emitter.on(`tasks.${name}`, () => (emitter.emit(`tasks.${dep}`)));
+	});
+
+	emitter.on(`tasks.${name}`, cb);
+}

test/task.test.js

@@ -3,9 +3,24 @@ import isEmpty from 'is-empty';
 import noop from 'noop3';
 import {default as gupp, emitter as ee} from '../dist/';
 
-test('When gupp.task is called, a new entry should be made in the EventEmitter under \'tasks\'', t => {
+function clean() {
+	ee.removeAllListeners('tasks.hello');
+}
+
+test('When gupp.task(name, cb) is called, a new entry should be made in the EventEmitter under \'tasks\'', t => {
 	gupp.task('hello', noop);
 
 	t.false(isEmpty(ee.listeners('tasks.hello')));
 	t.is(ee.listeners('tasks.hello')[0], noop);
+
+	clean();
+});
+
+test('When gupp.task(name, deps, cb) is called, a number of new entries should be made in the EventEmitter', t => {
+	gupp.task('hello', ['world'], noop);
+
+	t.false(isEmpty(ee.listeners('tasks.hello')));
+	t.is(ee.listeners('tasks.hello').length, 2);
+
+	clean();
 });