Na minha execução, aparece o seguinte warning no console. Há algum problema com o código?
D:\projetos\AluraTim…ity-warnings.js:184 Electron Security Warning (Insecure Content-Security-Policy) This renderer process has either no Content Security Policy set or a policy with "unsafe-eval" enabled. This exposes users of this app to unnecessary security risks.
For more information and help, consult https://electronjs.org/docs/tutorial/security. This warning will not show up once the app is packaged.