Run a series of gulp tasks followed by a callback when they are complete. As long as all sub-tasks properly identify themselves as sync, async, stream, or promise, the callback will not execute until all sub-tasks are complete. Standard Gulp principles apply around dependencies as well.

gulpfile-runtasks.js

var gulp = require("gulp");

module.exports = runTasks;

// Run a series of subtasks and execute a callback when they're complete.
function runTasks(subTasks, next) {
	// If no subTasks were provided, just move on.
	if (!subTasks || !subTasks.length)
		return void (typeof next === "function" && next());
	// Always use an array.
	if (!Array.isArray(subTasks)) subTasks = [subTasks]

	// Use Gulp's allDone method and inject our subTasks
	var allDone = gulp.allDone.bind({ seq: subTasks, tasks: gulp.tasks })

	// Listen for task completes
	gulp.addListener("task_stop", check)
	gulp.addListener("task_err", check)

	// Add the subtasks to the sequence.
	gulp.start(subTasks)

	function check() {
		// Bail if our subTasks haven't all completed.
		if (!allDone()) return;
		gulp.removeListener("task_stop", check)
		gulp.removeListener("task_err", check)
		if (typeof next === "function") next()
	}
}