Add customserializer option to vitest.config.ts

[ecstrema]

Clear and concise description of the problem

For compatibility with jest, add customSerializers as a global option.

Workaround:

Add a setup function, which runs expect.addSnapshotSerializer before every test file.

Suggested solution

Follow Jest's API

Alternative

Add a global setup file option, which is just run once during the entire jest process (not for every test file). This file could do something like expect.addSnapshotSerializer(mySerializer).

Con: No Jest compat
Pro: More flexible

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.