Clear and concise description of the problem

Vite's some internal plugins uses the internal helper function fileToUrl, which emits asset file to dev-server/bundle and return a URL for using in generated module code. It's also very useful for external plugins to emit asset files.

Suggested solution

Export fileToUrl function from Vite and document it in the docs.

Alternative

Plugin authors could copy the code from fileToUrl from their plugins. This is very inelegant.

Additional context

No response

Validations

• Follow our Code of Conduct
• Read the Contributing Guidelines.
• Read the docs.
• Check that there isn't already an issue that request the same feature to avoid creating a duplicate.