function unsubscribe
Usage in Deno
```typescript import { unsubscribe } from "node:node__diagnostics_channel.d.ts"; ```
unsubscribe(name: string | symbol,onMessage: ChannelListener,): boolean
Remove a message handler previously registered to this channel with [subscribe](../.././node__diagnostics_channel.d.ts/~/subscribe).
```js
import diagnostics_channel from 'node:diagnostics_channel';
function onMessage(message, name) {
// Received data
}
diagnostics_channel.subscribe('my-channel', onMessage);
diagnostics_channel.unsubscribe('my-channel', onMessage);
```
onMessage: ChannelListener
The previous subscribed handler to remove
boolean
`true` if the handler was found, `false` otherwise.