Make bablyon parse files in module mode

Reviewed By: davidaurelio

Differential Revision: D6008659

fbshipit-source-id: 6ec3a5e1470e91208a6e71eeca3a2f7c5e755acf

packages/metro-bundler/src/JSTransformer/worker/extract-dependencies.js

@@ -29,7 +29,7 @@ const babylon = require('babylon');
  * but it's a tradeoff for simplicity.
  */
 function extractDependencies(code: string) {
-  const ast = babylon.parse(code);
+  const ast = babylon.parse(code, {sourceType: 'module'});
   const dependencies = new Set();
   const dependencyOffsets = [];