Add generate-asar task

build/tasks/build-task.coffee

@@ -160,7 +160,7 @@ module.exports = (grunt) ->
       cp path.join('resources', 'win', 'atom.js'), path.join(shellAppDir, 'resources', 'cli', 'atom.js')
       cp path.join('resources', 'win', 'apm.sh'), path.join(shellAppDir, 'resources', 'cli', 'apm.sh')
 
-    dependencies = ['compile', 'generate-license:save', 'generate-module-cache', 'compile-packages-slug']
+    dependencies = ['compile', 'generate-license:save', 'generate-module-cache', 'compile-packages-slug', 'generate-asar']
     dependencies.push('copy-info-plist') if process.platform is 'darwin'
     dependencies.push('set-exe-icon') if process.platform is 'win32'
     grunt.task.run(dependencies...)

build/tasks/generate-asar-task.coffee

@@ -0,0 +1,14 @@
+asar = require 'asar'
+path = require 'path'
+
+module.exports = (grunt) ->
+  {rm} = require('./task-helpers')(grunt)
+
+  grunt.registerTask 'generate-asar', 'Generate asar archive for the app', ->
+    done = @async()
+
+    appDir = grunt.config.get('atom.appDir')
+    asar.createPackage appDir, path.resolve(appDir, '..', 'app.asar'), (err) ->
+      return done(err) if err?
+      rm appDir
+      done()