Function compute_server_hmr_update 

pub async fn compute_server_hmr_update(
    chunk_lists: &[ServerHmrChunkList],
    from: Option<&ServerHmrChunkListVersion>,
    to: ReadRef<ServerHmrChunkListVersion>,
) -> Result<ServerHmrUpdate>

Kept outside Turbo Tasks so old pull baselines cannot reactivate.