Merge pull request rescript-lang#5008 from bloodyowl/fix-watch-mode-mjs

Don't trigger a rebuild if mjs file changes

Author: bobzhang

Diff for: bsb

@@ -310,6 +310,8 @@ if (watch_mode) {
 
         return !(fileName === '.merlin' ||
             fileName.endsWith('.js') ||
+            fileName.endsWith('.mjs') ||
+            fileName.endsWith('.cjs') ||
             fileName.endsWith('.gen.tsx') ||
             watch_generated.indexOf(fileName) >= 0 ||
             fileName.endsWith('.swp')