nestjs / nest / 837e18fc-8678-46c2-8d75-8d045ee82c96

89%

master: 90%

Pull #14995

circleci

feat(common): Add fallbackToMimetype support in FileTypeValidator

Introduce `fallbackToMimetype` option to allow fallback to mimetype validation
when magic number detection fails (e.g., for small or undetectable buffers like text or CSV files).

Also enhanced `buildErrorMessage()` to reflect precise validation failure reasons
depending on buffer presence and mimetype state.

Added unit tests to cover fallback logic and error message variants.

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