# warn

`import { warn } from "destack:telemetry";`

Write one warning event.

```ds title="warn"
export function warn(name: &'a readonly string, fields?: Fields | undefined): void
```

[language/library/src/telemetry/log.ds:111:113](https://github.com/destack-sh/destack/blob/main/language/library/src/telemetry/log.ds#L111-L113)