Function onPartialResult

onPartialResult(callback: (text: string) => void): () => void
Subscribe to partial recognition results.

Partial results are emitted in real time as the user speaks, providing intermediate text that may change as more audio is processed. Useful for displaying live transcription or tracking reading progress.
Parameters
- callback: (text: string) => void
  Called with the current partial text.
Returns () => void
A function that removes the listener when called.
Example
```
const unsubscribe = onPartialResult((text) => {
  console.log('Hearing:', text);
});
```