`meta` is missing from `this.getModuleInfo` during rebuilds in `build --watch`

[dominikg]

Describe the bug

according to https://rollupjs.org/plugin-development/#this-getmoduleinfo

meta itself should not be overwritten, but it is ok to mutate its properties at any time to store meta information about a module. The advantage of doing this instead of keeping state in a plugin is that meta is persisted to and restored from the cache if it is used, e.g. when using watch mode from the CLI.

so returning meta from a transform hook for an id one can expect it to be available for the remainder of build --watch running.

but if you check out the 2 plugins in this vite config https://github.com/dominikg/getmoduleinfo-build-watch-repro/blob/main/vite.config.js and follow the reproduction steps, its not the case.

discovered in sveltejs/vite-plugin-svelte#1186

possibly related:
#18914 (during dev and same id instead of different id)

Reproduction

https://github.com/dominikg/getmoduleinfo-build-watch-repro

Steps to reproduce

• run pnpm i && pnpm build --watch
• edit src/counter.js to add a new empty line and save
• observe error on console

System Info

vite 7.1.1

Used Package Manager

pnpm

Logs

No response

Validations

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