54 lines
1.3 KiB
Markdown
54 lines
1.3 KiB
Markdown
# merge-streams
|
|
|
|
> Merge multiple streams into a unified stream
|
|
|
|
## Install
|
|
|
|
```sh
|
|
npm install @sindresorhus/merge-streams
|
|
```
|
|
|
|
## Usage
|
|
|
|
```js
|
|
import mergeStreams from '@sindresorhus/merge-streams';
|
|
|
|
const stream = mergeStreams([streamA, streamB]);
|
|
|
|
for await (const chunk of stream) {
|
|
console.log(chunk);
|
|
//=> 'A1'
|
|
//=> 'B1'
|
|
//=> 'A2'
|
|
//=> 'B2'
|
|
}
|
|
```
|
|
|
|
## API
|
|
|
|
### `mergeStreams(streams: stream.Readable[]): MergedStream`
|
|
|
|
Merges an array of [readable streams](https://nodejs.org/api/stream.html#readable-streams) and returns a new readable stream that emits data from the individual streams as it arrives.
|
|
|
|
If you provide an empty array, it returns an already-ended stream.
|
|
|
|
#### `MergedStream`
|
|
|
|
_Type_: `stream.Readable`
|
|
|
|
A single stream combining the output of multiple streams.
|
|
|
|
##### `MergedStream.add(stream: stream.Readable): void`
|
|
|
|
Pipe a new readable stream.
|
|
|
|
Throws if `MergedStream` has already ended.
|
|
|
|
##### `MergedStream.remove(stream: stream.Readable): boolean`
|
|
|
|
Unpipe a stream previously added using either [`mergeStreams(streams)`](#mergestreamsstreams-streamreadable-mergedstream) or [`MergedStream.add(stream)`](#mergedstreamaddstream-streamreadable-void).
|
|
|
|
Returns `false` if the stream was not previously added, or if it was already removed by `MergedStream.remove(stream)`.
|
|
|
|
The removed stream is not automatically ended.
|