chore: explore parsers and printers

[manuel3108]

Closes #44
Relates #100

This basically duplicates #100 at this point. See #100 for up and downsides of this approach.

I was initially intending to get rid of a lot more dependencies (like the dependencies for handling html) and use svelte-ast-print instead, but this was opening too many issues at the same time. That's why I opted to "only" switch to acorn and esrap here, the rest can be done later.

Relevant PR's

• feat: support indexed access type esrap#18
• feat: add option for quote and indentation styles esrap#19

Benefits

• closer to other tools in the svelte ecosystem
• Faster bundling (~33% speed improvement locally from 4s to 3s, probably more with chore: use rolldown #371)
• Smaller bundle (locally 2.6MB vs 3.6MB)
• more consistent formatting than the strange things we sometimes experienced with recast
• we are in full control of the printing, as we can control esrap

Downsides

• More tooling that we need to control (code to maintain)
• Our custom typing for TSEstree as no good public alternative exists, that matches acorns output. We do have @typescript-eslint/types but that was just the one with the smallest pain points. Still exploring other options.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 3e2ee46

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

[pkg-pr-new]

Open in Stackblitz

npm i https://pkg.pr.new/sveltejs/cli/sv@380

npm i https://pkg.pr.new/sveltejs/cli/svelte-migrate@380

commit: 3e2ee46

[manuel3108]

updated PR description to be more accurate.