seems to be working like this

tools/app/angular-tour-of-heroes/package.json

@@ -4,7 +4,8 @@
   "scripts": {
     "ng": "ng",
     "start": "ng serve",
-    "build": "ng build",
+    "build": "ng build && cp ./src/electron-app.js ./dist",
+    "electron-start": "./node_modules/.bin/electron dist/electron-app.js",
     "test": "ng test",
     "lint": "ng lint",
     "e2e": "ng e2e"
@@ -30,6 +31,7 @@
     "@types/jasmine": "~3.6.0",
     "@types/node": "^12.11.1",
     "codelyzer": "^6.0.0",
+    "electron": "^11.1.1",
     "jasmine-core": "~3.6.0",
     "jasmine-spec-reporter": "~5.0.0",
     "karma": "~5.1.0",