Function open_json_visualizer 

pub fn open_json_visualizer(
    roots: &[HydroRoot],
    config: Option<HydroWriteConfig>,
) -> Result<()>

Available on crate feature viz only.

Opens Hydro IR roots as a JSON visualization in the browser. Automatically handles compression and file-based fallback for large graphs.

This function generates JSON from the Hydro IR and opens it in the configured visualizer (defaults to https://hydro.run/docs/hydroscope, can be overridden with HYDRO_VISUALIZER_URL environment variable).