Stream-promise NPM

stream-promise

Convert any Stream instance to thenable

So it can be consumed both as a promise and as a stream

Installation

npm install stream-promise

Usage

Stream must be either readable or writable.

In case of readable streams, promise resolves with concatenated output, in case of writable streams resolve with undefined

To achieve expected result stream should be converted immediately after initialization.

const streamPromise = require("stream-promise");

streamPromise(someReadableStream);

someReadableStream.then(result => { console.log("Concatenated stream output", result); });

streamPromise(someWritabletream);

someReadableStream.then(result => { console.log("Cumulated stream output", result); });

Already emitted data is accessible at emittedData property

Non-destructive way

Sepearate promise (without touching stream object) can be created with to-promise util:

const streamToPromise = require("stream-promise/to-promise");

const someReadableStreamPromise = streamPromiseTo(someReadableStream);

someReadableStreamPromise.then(result => { console.log("Concatenated stream output", result); });