Update watcher rules

rescript

@@ -23,17 +23,6 @@ process.env.BSB_PROJECT_ROOT = cwd;
 const isTtyError = process.stderr.isTTY;
 const isTtyStd = process.stdout.isTTY;
 
-// If the project uses gentype and uses custom file extension
-// via generatedFileExtension, ignore them in watch mode
-var bsConfigFile = path.join(cwd, bsconfig);
-var genTypeFileExtension = ".gen.tsx";
-if (fs.existsSync(bsConfigFile)) {
-  var genTypeConfig = require(bsConfigFile).gentypeconfig;
-  if (genTypeConfig) {
-    genTypeFileExtension = genTypeConfig.generatedFileExtension;
-  }
-}
-
 let verbose = false;
 
 /**
@@ -358,14 +347,13 @@ Please pick a different one using the \`-ws [host:]port\` flag from bsb.`);
     // This could cause problems if source builds (generating js files in the same directory) are supported.
     if (!fileName) return true;
 
-    return !(
-      fileName === ".merlin" ||
-      fileName.endsWith(".js") ||
-      fileName.endsWith(".mjs") ||
-      fileName.endsWith(".cjs") ||
-      fileName.endsWith(genTypeFileExtension) ||
-      watchGenerated.indexOf(fileName) >= 0 ||
-      fileName.endsWith(".swp")
+    return (
+      ((fileName.endsWith(".res") ||
+        fileName.endsWith(".resi") ||
+        fileName.endsWith(".ml") ||
+        fileName.endsWith(".mli")) &&
+        !watchGenerated.includes(fileName)) ||
+      fileName === bsconfig
     );
   }