# node:cluster

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# `node:cluster`

## Import

```js
import cluster from "nstdlib/cluster";
```

> [!NOTE]
> Only the API surface is available. No process spawning.

## Runtime support

| Where it runs | Status | Export coverage | Details |
| ------------- | ------ | --------------- | ------- |
| **nstd** | ⚠️ some support | – | 54/79 of Node's own eligible tests pass under nstd. |
| **Browser** | ❔ not tested | 100% of Node.js | It imports with the small process shim. 15/15 Node.js exports are available. No module-specific behavior test ran. |
| **Node.js (host)** | ⚠️ some support | 100% of Node.js | 16/16 exports. |

## Exports (16 of 16)

Each cell shows what happens when code reads an export:

- ✅ Available through every import style. A named error also counts.
- ⚠️ Available through only some import styles.
- ❔ The export exists but has no value.
- ❌ The export does not exist.
- – This environment was not measured.

| Export | Node.js | nstdlib | browser |
| ------ | ------- | ------- | ------- |
| `SCHED_NONE` | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> |
| `SCHED_RR` | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> |
| `Worker` | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> |
| `_events` | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> |
| `_eventsCount` | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> |
| `_maxListeners` | <span title="Undefined" aria-label="Undefined">❔</span> | <span title="Undefined" aria-label="Undefined">❔</span> | <span title="Missing" aria-label="Missing">❌</span> |
| `disconnect` | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> |
| `fork` | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> |
| `isMaster` | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> |
| `isPrimary` | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> |
| `isWorker` | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> |
| `schedulingPolicy` | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> |
| `settings` | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> |
| `setupMaster` | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> |
| `setupPrimary` | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> |
| `workers` | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> |