chore: use parse from svelte/compiler

[manuel3108]

Closes #94
Closes svelte-add/svelte-add#193
Closes svelte-add/svelte-add#507

This is a pretty rough poc to try and make sv work better with .svelte files. Under the hood, this uses svelte-ast-print

Step 1 (support for svelte files):

• support for svelte specifc html syntax (@attach, self closing component tags, transitions, etc)
• check and adapt all other usages of parseSvelte
• make svelte-ast-print support indentation and quote styles (I think some of that already works)
• fix formatting mistakes in svelte-ast-print (first write up: fix: formatting for text nodes xeho91/js-ast#128)

Step 2 (reduce deps, different pr probably)

• we currently use many different libraries for parsing and serializing JS / CSS / HTML. All of that could in theory be handled by svelte/compiler and svelte-ast-print. Check which hoops we need to jump to make that happen. We could potentially drop the following deps:
  • dom-serializer
  • domhandler
  • domutils
  • htmlparser2
  • postcss

[changeset-bot]

⚠️ No Changeset found

Latest commit: 4f84d68

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR

[svelte-docs-bot]

Preview: https://svelte-dev-git-preview-cli-568-svelte.vercel.app/

[pkg-pr-new]

Open in StackBlitz

npx https://pkg.pr.new/sveltejs/cli/sv@568

npx https://pkg.pr.new/sveltejs/cli/svelte-migrate@568

commit: 4f84d68