Recursive fs.watch

file.js

fs.readdir(srcPath, handleDirectoryRead.bind(null, srcPath));

function handleDirectoryRead(srcPath, err, files) {
	files.forEach(handleFile.bind(null, srcPath));	
}

function handleFile(srcPath, file) {
	var uri = path.join(srcPath, file);
	fs.stat(uri, handleStat.bind(null, uri));
}

function handleStat(uri, err, stat) {
	if (stat.isDirectory()) {
		fs.readdir(uri, handleDirectoryRead.bind(null, uri));
	} else {
		fs.watch(uri, build);
	}
}