Make Packager send fresh modules through HMR interface

Reviewed By: frantic

Differential Revision: D2787951

fb-gh-sync-id: 63c04710b60d99b5161ef9a40b116ba2f72df745

react-packager/src/Bundler/index.js

@@ -277,6 +277,29 @@ class Bundler {
     });
   }
 
+  bundleForHMR({
+    entryFile,
+    platform,
+  }) {
+    return this.getDependencies(entryFile, /*isDev*/true, platform).then(response => {
+      const module = response.dependencies.filter(module => module.path === entryFile)[0];
+
+      return Promise.all([
+        module.getName(),
+        this._transformer.loadFileAndTransform(path.resolve(entryFile)),
+      ]).then(([moduleName, transformedSource]) => {
+        return (`
+          __accept(
+            '${moduleName}', 
+            function(global, require, module, exports) { 
+              ${transformedSource.code}
+            }
+          );
+        `);
+      });
+    });
+  }
+
   invalidateFile(filePath) {
     this._transformer.invalidateFile(filePath);
   }

react-packager/src/Server/index.js

@@ -112,6 +112,17 @@ const bundleOpts = declareOpts({
   }
 });
 
+const hmrBundleOpts = declareOpts({
+  entryFile: {
+    type: 'string',
+    required: true,
+  },
+  platform: {
+    type: 'string',
+    required: true,
+  },
+});
+
 const dependencyOpts = declareOpts({
   platform: {
     type: 'string',
@@ -220,6 +231,17 @@ class Server {
     return this.buildBundle(options);
   }
 
+  buildBundleForHMR(options) {
+    return Promise.resolve().then(() => {
+      if (!options.platform) {
+        options.platform = getPlatformExtension(options.entryFile);
+      }
+
+      const opts = hmrBundleOpts(options);
+      return this._bundler.bundleForHMR(opts);
+    });
+  }
+
   getDependencies(options) {
     return Promise.resolve().then(() => {
       if (!options.platform) {