Exclude src folder from the published package

[limonte]

Follow-up from #1160

In order to avoid any confusions, src folder should be excluded from the published package.

The correct way to import Swal without styles is

import Swal from 'sweetalert2/dist/sweetalert2.js'

As the nice bonus: the bundle size will be slightly smaller:

Before:

npm pack
npm notice package size:  114.1 kB
npm notice unpacked size: 517.1 kB
npm notice total files:   69

After:

npm pack
npm notice package size:  93.9 kB
npm notice unpacked size: 439.0 kB
npm notice total files:   16

[zenflow]

Unforeseen detail here: What about the scss files located under src/? I would think we want to continue to ship those in the package, since probably a lot of people are customizing the variables and @importing "../../node_modules/src/sweetalert2.scss" in their own sass code.

[limonte]

Unforeseen detail here: What about the scss files located under src/?

Good point. Should we separate them into scss folder? I was never comfortable with scss and js files mixed in one folder.

I'm opened for the folder name discussion. To be explicit, we can go with scss, or, to be fancier, stylesheets could be an option (inspired by http://thesassway.com/beginner/how-to-structure-a-sass-project)

[limonte]

As discussed in #1281 (comment) we need src files because we want to provide the ability to import uncompiled files (e.g. for security reasons).

As for scss files, well it would be better to have them separately, but there are no strong reasons to bring another one breaking change.

So, wontfix.