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# 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.
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