Function generate_hooks 

pub fn generate_hooks<P: AsRef<Path>, P2: AsRef<Path>, P3: AsRef<Path>>(
    protos: &[P],
    includes: &[P2],
    to_path: &Option<P3>,
    prost_mod: Option<&str>,
    uri: &str,
) -> Result<(), Error>

• to_path: Is the directory in which files should be written to. When None, defaults to OUT_DIR
• prost_mod: If you moved the codegen of proto in a module