method Cluster.setupPrimary
Usage in Deno
```typescript import { type Cluster } from "node:node__cluster.d.ts"; ```
Cluster.setupPrimary(settings?: ClusterSettings): void
`setupPrimary` is used to change the default 'fork' behavior. Once called, the settings will be present in `cluster.settings`.
Any settings changes only affect future calls to [`.fork()`](https://nodejs.org/docs/latest-v22.x/api/cluster.html#clusterforkenv)
and have no effect on workers that are already running.
The only attribute of a worker that cannot be set via `.setupPrimary()` is the `env` passed to
[`.fork()`](https://nodejs.org/docs/latest-v22.x/api/cluster.html#clusterforkenv).
The defaults above apply to the first call only; the defaults for later calls are the current values at the time of
`cluster.setupPrimary()` is called.
```js
import cluster from 'node:cluster';
cluster.setupPrimary({
exec: 'worker.js',
args: ['--use', 'https'],
silent: true,
});
cluster.fork(); // https worker
cluster.setupPrimary({
exec: 'worker.js',
args: ['--use', 'http'],
});
cluster.fork(); // http worker
```
This can only be called from the primary process.
optional
settings: ClusterSettings
void