Response factory for serving static assets. Asset resolution uses the provided ServeAssetOptions, the Request is only used for caching headers like ETag etc.

TypeScript (ts & tsx) assets will not be served. They will be treated as if they don't exist.

If the --unstable and --allow-write permissions are granted, the asset preparation procedure will be started for the given assets directory, if it hasn't already been started by a previous request. See the prepareAssets() function for more information.