fix: expose issue.path in .allIssues() for field containers

[sillvva]

fixes #14688

Changes .allIssues() from { message: string } to the following to indicate where in the field container the issue occurred.

Demo

export interface RemoteFormAllIssue {
	message: string;
  path: Array<string | number>;
}

As the issue shows, this can be used to group issues with Object.groupBy().

Discriminated Unions

#14771 was a big step forward to being able to work with discriminated union schemas. However, you still can't get the issues for a field in a D.U. Having access to the path here would be the final thing needed to support D.U. schemas. You still can't use .as() or .issues(), but you can set the attributes manually like this:

Discriminated Union Demo

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Latest commit: 0ab1434

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Preview: https://svelte-dev-git-preview-kit-14784-svelte.vercel.app/

[dummdidumm]

thank you!

[Rich-Harris]

I don't love that we added a new interface for this. Wouldn't it be simpler to just add path to RemoteFormIssue?

[Rich-Harris]

opened #14864

[sillvva]

You're right. I could have done that too.