gulp: generate non-minified files for debug and use gulp tasks

[roipoussiere]

This PR builds Javascript and CSS files without minifying them, useful for debugging purposes. The dist folder hierarchy is now:

dist
├── easymde.css
├── easymde.js
├── easymde.min.css
└── easymde.min.js

No more unpractical Javascript errors like "error line 7, column 291438".

It also uses gulp tasks instead of functions.

In this way we can call a specific gulp task, among gulp lint, gulp build-js, gulp build-css, gulp minify-js, gulp minify-css, gulp build, gulp minify, gulp.

edit: sorry for merge commit, you can squash it with the first one when merging to master.

[Ionaru]

Couple of issues I have with this:

Because these files are now created when gulp is ran, they are now packaged and sent to npm as well.
I don't think we should publish debug builds to npm.
The same could be achieved with sourcemaps.

---

You're using an old way of creating tasks in gulp and this is discouraged by gulp itself. Since gulp 4.0.0 a task should be defined like this:

function build() { ... }
exports.build = build;

Or in typescript:

export function build() { ... }

https://gulpjs.com/docs/en/getting-started/creating-tasks

[axe312ger]

Instead of seeing it as debug build, why not exporting them as es6 modules without minification. People using bundlers like webpack would benefit from this and debugging will be way easier :)

[A-312]

Couple of issues I have with this:

Because these files are now created when gulp is ran, they are now packaged and sent to npm as well.
I don't think we should publish debug builds to npm.

We can ignore this file when we do npm publish with files settings in package.json: https://docs.npmjs.com/files/package.json#files

The same could be achieved with sourcemaps.

+1 sourcemaps is a more practical alternative.

[roipoussiere]

Hello, what is a status of this PR? Should I modify something or just drop the idea?

[A-312]

@roipoussiere gulp.task is the old solution

https://www.sitepoint.com/how-to-migrate-to-gulp-4/