run onFinish every time a build finishes (#1067)

Author: jasonLaster

packages/devtools-launchpad/package.json

@@ -1,6 +1,6 @@
 {
   "name": "devtools-launchpad",
-  "version": "0.0.123",
+  "version": "0.0.124",
   "license": "MPL-2.0",
   "description": "The Launchpad makes it easy to build a developer tool for Firefox, Chrome, and Node.",
   "repository": {

packages/devtools-launchpad/src/tools/mc/make-bundle.js

@@ -30,7 +30,8 @@ function makeBundle({
   outputPath,
   projectPath,
   watch = false,
-  updateAssets = false
+  updateAssets = false,
+  onFinish = () => {}
 }) {
   process.env.TARGET = "firefox-panel";
   process.env.OUTPUT_PATH = outputPath;
@@ -54,6 +55,7 @@ function makeBundle({
         console.log(`Done bundling`);
       }
 
+      onFinish(stats);
       resolve();
     };