[react-packager] Implement getJSModulePaths API

packager/react-packager/src/Packager/Package.js

@@ -249,6 +249,15 @@ Package.prototype._getMappings = function() {
   return mappings;
 };
 
+Package.prototype.getJSModulePaths = function() {
+  return this._modules.filter(function(module) {
+    // Filter out non-js files. Like images etc.
+    return !module.virtual;
+  }).map(function(module) {
+    return module.sourcePath;
+  });
+};
+
 Package.prototype.getDebugInfo = function() {
   return [
     '<div><h3>Main Module:</h3> ' + this._mainModuleId + '</div>',

packager/react-packager/src/Packager/__tests__/Package-test.js

@@ -204,8 +204,28 @@ describe('Package', function() {
       expect(p.getAssets()).toEqual([asset1, asset2]);
     });
   });
+
+  describe('getJSModulePaths()', function() {
+    it('should return module paths', function() {
+      var p = new Package('test_url');
+      p.addModule(new ModuleTransport({
+        code: 'transformed foo;\n',
+        sourceCode: 'source foo',
+        sourcePath: 'foo path'
+      }));
+      p.addModule(new ModuleTransport({
+        code: 'image module;\nimage module;',
+        virtual: true,
+        sourceCode: 'image module;\nimage module;',
+        sourcePath: 'image.png',
+      }));
+
+      expect(p.getJSModulePaths()).toEqual(['foo path']);
+    });
+  });
 });
 
+
  function genSourceMap(modules) {
    var sourceMapGen = new SourceMapGenerator({file: 'bundle.js', version: 3});
    var packageLineNo = 0;