CODEWITHSUNDEEP
javascriptnode.jsgulp
Alan2
Alan2

Reputation: 24602

What's the significance of a parameter in a function call when using gulp 4 .series?

I'm trying to understand more about running gulp4 tasks in a serial manner. One answer that was given to me was this:

gulp.task('make-prod-ex1', gulp.series(
    function(done) {
        makeAppHtml('app/**/*ex1', done);
    }, 
    'makeTemplate',
    'clean-css',
    'make-css-files',
    'make-css-bundle',
    'rename-css-bundle',
    'clean-js',
    'make-js-bundle',
    'rename-js-bundle',
    'rename-index',
     function (done) {
        console.log("Completed");
        done();
     }));

Something I don't understand is what is the significance of the word done here.

Why is there a done in the first function call, why is it an argument of makeAppHtml and why is it used again in the last function call but this time with a () after it?

Note that I did check the gulp docs and again I see so many uses of the word done but I don't know why its there:

   https://gulp.readme.io/docs/gulpseriestasks

Upvotes: 0

Views: 50

Answers (1)

alexmac
alexmac

Reputation: 19617

done it's callback which informs the gulp that the task is finished.

Any gulp task can be written by two ways:

gulp.task('default', () {
  return gulp
    .src(...)
    .pipe(anyGulpPlugin())
    .dest(...);
});

Or so:

gulp.task('default', done => {
  gulp
    .src(...)
    .pipe(anyGulpPlugin())
    .dest(...)
    .on('end', done);
});

Upvotes: 1

Related Questions