Add `@sveltejs/enhanced-img`

[benmccann]

I had been holding off because I thought one of the issues might necessitate changing the API, but it looks like that's not necessary and things should be pretty stable now.

There's a webp and png in the demo app:

cli/packages/create/templates/demo/src/routes/+page.svelte

Line 3 in d1f4432

import welcome from '$lib/images/svelte-welcome.webp';

We should just have the png and enhanced-img will generate the webp and avif automatically.

It would also be nice to add to the skeleton project as I think no one should be shipping unoptimized images. For the skeleton app, it potentially could be a question like:

What image optimization should be used?

• build-time optimization with @sveltejs/enhanced-img
• fetch from CDN with @unpic/svelte
• none

Finally, I don't really like that images are currently stored in $lib/images. This seems like it will just become a huge unorganized catch-all. Images can live in the folder where they're used alongside the +page.svelte that includes them. This should help keep things a bit more organized. At least this was one of Rich's original arguments in favor of +page.svelte. But we don't really demonstrate that and guide users down that path today

[manuel3108]

Relates #203
Relates #218

Sounds good to me. What were you thinking about? Adding it to the default template or creating an adder? I wouldn't like doing both though, as we don't have that case anywhere currently.

[garikAsplund]

I'd be happy to give it a go with a little more direction in terms of the desired setup.

Somewhat related is this issue which I commented on a bit ago and am still unsure whether or not it's an enhanced-img or vite-imagetools problem.

[manuel3108]

Notes from maintainer meetings:

• provide it by default for demo template - for sure
• also add it to all other templates and use it.
  • we considered adding it to kit directly, but decided against it.
• create an addon to make that happen for existing projects as well.

Note: we should make find a way to run addons right after creating a project. Otherwise we would need to add it to the templates & and as an addon which would duplicate the work.