Function generate_files 

pub fn generate_files(
    proto_file: &[FileDescriptorProto],
    file_to_generate: &[String],
    options: &Options,
) -> Result<Vec<GeneratedFile>>

Generate ConnectRPC service bindings + buffa message types from proto descriptors, appended into a single per-file output.

Returns one GeneratedFile per proto file in file_to_generate. Does not emit a mod.rs — callers assemble the module tree themselves (typically connectrpc-build via an include!-based file).

This is the unified path: service stubs reference message types via super::-relative paths, so both must live in the same module tree. Options::extern_paths is ignored.

Errors

Returns an error if buffa-codegen fails (e.g. unsupported proto feature) or if the generated service binding Rust does not parse under syn (indicates a bug in this crate).