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    Type Alias ViteFileNameFn

    ViteFileNameFn: Exclude<LibraryOptions["fileName"], string | undefined>

    A function that can be defined on Vite where it expects you to decide the name of a file based on the output format.

    the fileName parameter here is an extensionless filename.

    For example if an entry point is at 'src/api/hello.ts' the name it will pass is just 'hello'