Function run_dev_loop 

pub fn run_dev_loop<F: FnMut(&[PathBuf])>(
    watcher: &EventWatcher,
    graph: &DepGraph,
    broadcaster: &HmrBroadcaster,
    output_dir: &Path,
    rebuild: F,
) -> usize

Pumps debounced batches off watcher and broadcasts each frame.

The closure rebuild is called once per batch with the invalidated output list so callers can plug in the incremental pipeline.

Returns the number of batches processed before the watcher closed, which is useful for tests that inject a finite event stream.

Examples

// Requires a real EventWatcher + HmrBroadcaster bound to a port,
// which a doctest sandbox can't safely set up. See the `dev` binary
// (`src/bin/dev.rs`) for a runnable wiring.
use ssg::dev_server::run_dev_loop;