run-sequence

gulpfile.js

var runSequence = require('run-sequence');

gulp.task('some-task', function() {
	runSequence(
		['task-1', 'task-2', 'task-3'], // These 3 can be done in parallel
		'task-4', // ...then just do this
		['task-5', 'task-5'], // ...then do these things in parallel
		'task-6', // ...then do this
		// ....
	);
});