method Worker.prototype.send
Usage in Deno
```typescript import { Worker } from "node:node__cluster.d.ts"; ```
Worker.prototype.send(message: child.Serializable,callback?: (error: Error | null) => void,): boolean
Send a message to a worker or primary, optionally with a handle.
In the primary, this sends a message to a specific worker. It is identical to [`ChildProcess.send()`](https://nodejs.org/docs/latest-v22.x/api/child_process.html#subprocesssendmessage-sendhandle-options-callback).
In a worker, this sends a message to the primary. It is identical to `process.send()`.
This example will echo back all messages from the primary:
```js
if (cluster.isPrimary) {
const worker = cluster.fork();
worker.send('hi there');
} else if (cluster.isWorker) {
process.on('message', (msg) => {
process.send(msg);
});
}
```
boolean
Worker.prototype.send(message: child.Serializable,sendHandle: child.SendHandle,callback?: (error: Error | null) => void,): boolean