Run multiple asynchronous tasks and stream tasks inside a single Gulp task

multiple-gulp-async.js

var gulp = require('gulp');

// a regular async function
function async(done) {
    console.log('async start');

    // take your time doing anything you want
    setTimeout(function () {
        console.log('async end');
        done();
    }, 500);
}

// create a task to do multiple things
gulp.task('multitask', function () {

    // Get the target stream.
    var target = gulp.dest('folder');

    // Call your asynchronous method.
    async(function () {

        // Execute your regular pipe tasks here.
        gulp.src('file.txt')
            .pipe(target);

        console.log('multitask is done');
    });

    // Return the target stream. This lets Gulp know this task is asynchronous,
    // and it will wait for the stream to end before continuing.
    return target;
});

gulp.task('test', ['multitask'], function () {
    console.log('test is executing');
});