feat: Define the MountOptions type

[webJose]

Svelte 5 rewrite

Closes #13655.

Please note that the Svelte codebase is currently being rewritten for Svelte 5. Changes should target Svelte 5, which lives on the default branch (main).

If your PR concerns Svelte 4 (including updates to svelte.dev.docs), please ensure the base branch is svelte-4 and not main.

Before submitting the PR, please make sure you do the following

• It's really useful if your PR references an issue where it is discussed ahead of time. In many cases, features are absent for a reason. For large changes, please create an RFC: https://github.com/sveltejs/rfcs
• Prefix your PR title with feat:, fix:, chore:, or docs:.
• This message body should clearly illustrate what problems it solves.
• Ideally, include a test that fails without this PR but passes with it.

Tests and linting

• Run the tests with pnpm test and lint the project with pnpm lint

[changeset-bot]

🦋 Changeset detected

Latest commit: cdfa314

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
svelte	Minor

Not sure what this means? Click here to learn what changesets are.

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

[brunnerh]

This is backwards.

• Move the MountOptions type to packages/svelte/src/index.d.ts.
• Add to import in render.js and adjust the two mount function signatures

  - /** @import { Component, ComponentType, SvelteComponent } from '../../index.js' */
  + /** @import { Component, ComponentType, SvelteComponent, MountOptions } from '../../index.js' */

• Run the build or generate:types script of the package to update the types/index.d.ts.
• (Probably run format script on the workspace to fix stuff.)

There also seems to be some parentheses missing here:

	intro?: boolean;
- } & {} extends Props ? {
+ } & ({} extends Props ? {
	/**
	 * Component properties.
	 */
	props?: Props;
} : {
	/**
	 * Component properties.
	 */
	props: Props;
- }
+ })

[webJose]

I see, so types/index.d.ts is a generated file. I am not used to storing generated files in source control. That was a curve ball for me.

[brunnerh]

Agreed, it's a bit odd...

[brunnerh]

You could add a feat: changeset mentioning that the mount options are now exported.

[webJose]

Thanks for the hand holding. Appreciated. If I can bother you for one more thing: How is the changeset generated? Never used this before. Any link for a quick tutorial?

[brunnerh]

The bot posted a link in its comment, also never dealt with them.

[webJose]

Shoot! I did not notice. Alright, I think I'm all set then. Cheers!

[webJose]

Ok, I think I'm done.

[brunnerh]

Looks good to my non-maintainer eyes, don't forget to publish this as a proper PR.

[webJose]

Meaning taking it out of draft mode?

[trueadm]

Thanks

[trueadm]

Please could you run pnpm format on your PR to fix the lint issues?

[webJose]

Hello. I ran pnpm format, but there must be something wrong going on because once it finishes, it shows over 3.000 changes:

Even more interesting, diffing doesn't seem to highlight any changes in any of the files that I checked. Any pointers?

[trueadm]

@webJose I'll update your PR.

[webJose]

Thanks! Very kind of you. Much appreciated.