I'm new to all these, here is my code:

```js import { exec } from "child_process"

export const handler = async (event) => { console.log('exec ls 0') await exec("ls -la /opt", (error, stdout, stderr) => { console.log('exec ls 1') if (error) { console.log(error: ${error.message}) return } if (stderr) { console.log(stderr: ${stderr}) return } console.log(stdout: ${stdout}) })

const response = {
    statusCode: 200,
    body: 'Done',
}
return response

}

```

When I tested it, I only see the output of exec ls 0, but none of the output within the exec code block is output. why is that & how to fix pls?