I just tested against SvelteKit successfully:

• pnpm create svelte@6.1.0 myapp
• Select "Yes, using TypeScript syntax" and "Add ESLint for code linting"
• Change the typescript-eslint version to 8.0.0-alpha.20
• pnpm install
• pnpm lint

This uses eslint 9, the new configs, etc. We had rolled out eslint 9 support (in create-svelte version 6.1.0, which is why the steps above use that version) and then had to rollback since typescript-eslint didn't support it yet. I'm eager for a final release of typescript-eslint so that we can move back to eslint 9 again. Is there a list of blocking issues or is the timeline for a final release calendar-based instead?

Thanks for all your work on this!

Ah! That's fantastic, thanks @benmccann! You beat us to it very nicely. 😄

move back to eslint 9 again

If you're up for it, you could keep on the v8 beta. It's behaviorally stable. The only pending "breaking" changes are those noted with a ⏳ in https://typescript-eslint.io/blog/announcing-typescript-eslint-v8-beta, none of which should more than trivially impact your end-user experience.

The biggest risk is of the preset shared configs changing which rules are enabled by default - which you can always disable in your eslint.config.* / with inline comments upon switching versions.

list of blocking issues ... calendar-based

It's both.

• Blocking issues: we're tracking it with the https://github.com/typescript-eslint/typescript-eslint/milestone/9
  • Query for open issues in the 8.0.0 milestone
• We also want to wait 2-4 months, to give folks a chance to try it out

So the earliest it would likely be released is ~July, and the latest we'd be happy with is ~September.

Thanks for all the details. I just released a new version of create-svelte, so anyone who sets up a new SvelteKit project with both TypeScript and eslint will use typescript-eslint version ^8.0.0-alpha.20

Note that I'm waiting on #9102 to land before taking action on this myself.

✅

Prettier is ready, sir!

BTW, maybe we should also mention #8920 in https://typescript-eslint.io/blog/announcing-typescript-eslint-v8-beta/ somewhere?

Also updated to v8 in @csstools : csstools/postcss-plugins#1412

postcss-preset-env and all postcss plugins, parsers, ... are using this latest version now.

The checklist in the OP is full of created PRs and discovered issues have been filed on our end. We're gearing up for the v8 release Soon ™️ (🤞) so I'll close this issue out.

THANK YOU to everyone who participated on this thread and/or the PRs! We really appreciate it! ❤️

For visibility: now that v8 is released, I'll go through and update the draft PRs I'd sent over the next couple of days.