Gulp itself is tiny: index.js contains [very few lines of code](https://github.com/gulpjs/gulp/blob/4.0/index.js).

It is powered by a few other libraries which each handle a few specific tasks

each.

You can view all issues with the "help wanted" label across all gulp projects

here: https://github.com/issues?utf8=%E2%9C%93&q=is%3Aopen+is%3Aissue+user%3Agulpjs+label%3A%22help+wanted%22+

Undertaker handles task management in Gulp: the `gulp.task()`, `gulp.series()`

and `gulp.parallel()` functions. `gulp.series()` and `gulp.parallel()` are in

turn powered by Bach.

- https://github.com/gulpjs/undertaker

- https://github.com/gulpjs/bach

vinyl-fs powers the `gulp.src()` and `gulp.dest()` functions: they take files

and globs specified by the user, turns them into a stream of file objects,

and then puts them back into the filesystem when `gulp.dest()` is called.

The file objects themselves are vinyl objects: that's another library (a simple

one!)

- https://github.com/gulpjs/vinyl-fs

- https://github.com/gulpjs/vinyl

`gulp.watch()` is using chokidar for file watching. It's actually wrapped in a

small library on the gulp organization, glob-watcher.

- https://github.com/paulmillr/chokidar

- https://github.com/gulpjs/glob-watcher

Finally, we have gulp-cli. This uses liftoff to take what people run in the

command line and run the correct tasks. It works with both gulp 4 and older

versions of gulp.

- https://github.com/gulpjs/gulp-cli

- https://github.com/js-cli/js-liftoff