enable prod mode for angular

src/scripts/utils.ts

@@ -0,0 +1,7 @@
+export function isDev() {
+    // ref: https://github.com/sindresorhus/electron-is-dev
+    if ('ELECTRON_IS_DEV' in process.env) {
+        return parseInt(process.env.ELECTRON_IS_DEV, 10) === 1;
+    }
+    return (process.defaultApp || /node_modules[\\/]electron[\\/]/.test(process.execPath));
+}