fix: include vite/types/* in exports field

[yuheiy]

Description

This PR exports the files under vite/types/*. This makes internal type definitions available for external reference.

Additional context

In Astro, we are referencing files within the types directory to provide users with type information like ViteHotContext and ImportGlobFunction.

https://github.com/withastro/astro/blob/b6066e109c5807f16dd81e07c81f300459e12897/packages/astro/import-meta.d.ts#L12-L20

However, these are not defined in exports field in Vite's package.json. As a result, when running tsc to check the contents of import-meta.d.ts, an error occurs. To resolve this, we need to extend the exports field in Vite's package.json.

ref:

withastro/astro#8360 (comment)

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What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

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[bluwy]

This sounds good to me. Presumably we only document /// <reference types="vite/types/importMeta" /> and that bypasses the exports which made it work.

Note though that this change is going into Vite 5. And Vite 5 should also include #14279 which fixes the core issue in Astro in the first place that needed to import the vite/types/*. Unless we backport this to Vite 4.