Update to electron-packager 13.0.x

app/build/tasks/package-task.js

@@ -254,14 +254,15 @@ module.exports = grunt => {
 
     resolveRealSymlinkPaths(grunt.config('appDir'));
 
-    packager(grunt.config.get('packager'), (err, appPaths) => {
-      clearInterval(ongoing);
-      if (err) {
+    packager(grunt.config.get('packager'))
+      .catch(err => {
         grunt.fail.fatal(err);
         return done(err);
-      }
-      console.log(`---> Done Successfully. Built into: ${appPaths}`);
-      return done();
-    });
+      })
+      .then(appPaths => {
+        clearInterval(ongoing);
+        console.log(`---> Done Successfully. Built into: ${appPaths}`);
+        return done();
+      });
   });
 };

app/src/browser/main.js

@@ -244,16 +244,18 @@ const start = () => {
   options.configDirPath = configDirPath;
 
   if (!options.devMode) {
-    const otherInstanceRunning = app.makeSingleInstance(commandLine => {
-      const otherOpts = parseCommandLine(commandLine);
-      global.application.handleLaunchOptions(otherOpts);
-    });
+    const gotTheLock = app.requestSingleInstanceLock();
 
-    if (otherInstanceRunning) {
+    if (!gotTheLock) {
       console.log('Exiting because another instance of the app is already running.');
       app.exit(1);
       return;
     }
+
+    app.on('second-instance', (event, commandLine, workingDirectory) => {
+      const otherOpts = parseCommandLine(commandLine);
+      global.application.handleLaunchOptions(otherOpts);
+    });
   }
 
   setupCompileCache(configDirPath);

package.json

@@ -22,7 +22,7 @@
     "devtron": "^1.4.0",
     "electron": "4.0.0-beta.11",
     "electron-installer-dmg": "0.2.x",
-    "electron-packager": "8.7.x",
+    "electron-packager": "13.0.x",
     "electron-winstaller": "2.x.x",
     "eslint": "^4.7.2",
     "eslint-config-prettier": "^2.9.0",