Logs Events
Log events are distributed by Modern.js as events of type log.
Built-in Events
Based on server-side runtime logic, Modern.js provides the following log events:
| Stage | Message | Level |
|---|---|---|
| RENDER_HTML | App Render To HTML | error |
| RENDER_STREAM | An error occurs during streaming SSR | error |
| RENDER_SHELL | An error occurs during streaming render shell | error |
Modern.js also retains SSR logs from legacy versions using useLoader:
| Stage | Message | Level |
|---|---|---|
| PRERENDER | App Prerender | error |
Built-in Monitor
In Modern.js, log events are handled by LoggerMonitor, which outputs logs to the console.
Info
The built-in LoggerMonitor depends on the rslog library.
For example, intentionally throwing an error in the project:
routes/page.tsx
import './index.css';
const Index = () => <div className="container-box">{a}</div>;
export default Index;If running normally, you can see the following output in the console:
> Local: http://localhost:8080/
> press h + enter to show shortcuts
error SSR Error - App Prerender, error = ReferenceError: a is not defined
at Index (/somepath/page.tsx:3:1)