fix: also watch cjs

Thanks to @lorand-horvath

Author: remy

lib/config/defaults.js

@@ -23,6 +23,7 @@ const defaults = {
   // nodemon.on('stdout/stderr')
   stdout: true,
   watchOptions: {},
+  ext: 'js mjs cjs json',
 };
 
 if ((process.env.NODE_OPTIONS || '').includes('--loader')) {