I think the user should be able to create their own reload filter and pass it this way. The current way of customizing reload filters is very limited, while this way removes all limitations.
import watchfiles
from granian import Granian
reload_filter_instance = watchfiles.PythonFilter(extra_extensions=(".html",))
# Let's call it reload_filter_instance to avoid making breaking changes
Granian(..., reload_filter_instance=reload_filter_instance).serve()
I am willing to submit a PR if you approve this change.
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