Bail internal transforms if there're no transforms to run

Reviewed By: sam-swarr

Differential Revision: D2810474

fb-gh-sync-id: d5ba48922c91c3dbacfccb0d087cc1deac14fa1c

packager/react-packager/src/JSTransformer/worker.js

@@ -15,6 +15,14 @@ var Transforms = require('../transforms');
 // transforms should be run after the external ones to ensure that they run on
 // Javascript code
 function internalTransforms(sourceCode, filename, options) {
+  var plugins = Transforms.getAll(options);
+  if (plugins.length === 0) {
+    return {
+      code: sourceCode,
+      filename: filename,
+    };
+  }
+
   var result = babel.transform(sourceCode, {
     retainLines: true,
     compact: true,
@@ -22,7 +30,7 @@ function internalTransforms(sourceCode, filename, options) {
     filename: filename,
     sourceFileName: filename,
     sourceMaps: false,
-    plugins: Transforms.getAll(options)
+    plugins: plugins,
   });
 
   return {