# node:util/types

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# `node:util/types`

## Import

```js
import util_types from "nstdlib/util/types";
```

> [!NOTE]
> Its behavior matches Node.js.

## Runtime support

| Where it runs | Status | Export coverage | Details |
| ------------- | ------ | --------------- | ------- |
| **nstd** | ⚠️ some support | – | 12/28 of Node's own eligible tests pass under nstd (filed under `util`, the parent module). |
| **Browser** | ❔ not tested | 100% of Node.js | It imports with the small process shim. 43/43 Node.js exports are available. No module-specific behavior test ran. |
| **Node.js (host)** | ✅ works | 100% of Node.js | 43/43 exports. |

## Exports (43 of 43)

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.

<details>
<summary>Show all 43 exports</summary>

| Export | Node.js | nstdlib | browser |
| ------ | ------- | ------- | ------- |
| `isAnyArrayBuffer` | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> |
| `isArgumentsObject` | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> |
| `isArrayBuffer` | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> |
| `isArrayBufferView` | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> |
| `isAsyncFunction` | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> |
| `isBigInt64Array` | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> |
| `isBigIntObject` | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> |
| `isBigUint64Array` | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> |
| `isBooleanObject` | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> |
| `isBoxedPrimitive` | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> |
| `isCryptoKey` | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> |
| `isDataView` | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> |
| `isDate` | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> |
| `isExternal` | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> |
| `isFloat16Array` | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> |
| `isFloat32Array` | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> |
| `isFloat64Array` | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> |
| `isGeneratorFunction` | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> |
| `isGeneratorObject` | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> |
| `isInt16Array` | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> |
| `isInt32Array` | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> |
| `isInt8Array` | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> |
| `isKeyObject` | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> |
| `isMap` | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> |
| `isMapIterator` | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> |
| `isModuleNamespaceObject` | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> |
| `isNativeError` | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> |
| `isNumberObject` | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> |
| `isPromise` | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> |
| `isProxy` | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> |
| `isRegExp` | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> |
| `isSet` | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> |
| `isSetIterator` | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> |
| `isSharedArrayBuffer` | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> |
| `isStringObject` | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> |
| `isSymbolObject` | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> |
| `isTypedArray` | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> |
| `isUint16Array` | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> |
| `isUint32Array` | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> |
| `isUint8Array` | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> |
| `isUint8ClampedArray` | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> |
| `isWeakMap` | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> |
| `isWeakSet` | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> | <span title="Available" aria-label="Available">✅</span> |

</details>