# node:stream
# `node:stream`
## Import
```js
import stream from "nstdlib/stream";
```
> [!NOTE]
> Its behavior matches Node.js.
## Runtime support
| Where it runs | Status | Export coverage | Details |
| ------------- | ------ | --------------- | ------- |
| **nstd** | ⚠️ some support | – | 199/219 of Node's own eligible tests pass under nstd. |
| **Browser** | ❔ not tested | 100% of Node.js | It imports with the small process shim. 23/23 Node.js exports are available. No module-specific behavior test ran. |
| **Node.js (host)** | ✅ works | 100% of Node.js | 23/23 exports. |
## Exports (23 of 23)
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 |
| ------ | ------- | ------- | ------- |
| `Duplex` | ✅ | ✅ | ✅ |
| `PassThrough` | ✅ | ✅ | ✅ |
| `Readable` | ✅ | ✅ | ✅ |
| `Stream` | ✅ | ✅ | ✅ |
| `Transform` | ✅ | ✅ | ✅ |
| `Writable` | ✅ | ✅ | ✅ |
| `_isArrayBufferView` | ✅ | ✅ | ✅ |
| `_isUint8Array` | ✅ | ✅ | ✅ |
| `_uint8ArrayToBuffer` | ✅ | ✅ | ✅ |
| `addAbortSignal` | ✅ | ✅ | ✅ |
| `compose` | ✅ | ✅ | ✅ |
| `destroy` | ✅ | ✅ | ✅ |
| `duplexPair` | ✅ | ✅ | ✅ |
| `finished` | ✅ | ✅ | ✅ |
| `getDefaultHighWaterMark` | ✅ | ✅ | ✅ |
| `isDestroyed` | ✅ | ✅ | ✅ |
| `isDisturbed` | ✅ | ✅ | ✅ |
| `isErrored` | ✅ | ✅ | ✅ |
| `isReadable` | ✅ | ✅ | ✅ |
| `isWritable` | ✅ | ✅ | ✅ |
| `pipeline` | ✅ | ✅ | ✅ |
| `promises` | ✅ | ✅ | ✅ |
| `setDefaultHighWaterMark` | ✅ | ✅ | ✅ |