promise2stream

promise2stream

Transform ES2015 Promise to Stream - specifically, Transform Stream using through2. Works in object mode by default, but you can pass options directly to the through2 package.

Install

npm i promise2stream --save

Usage

For more use-cases see the tests

const promise2stream = require('promise2stream')

promise2stream

Transform a Promise val to transform stream.

Params

• val {Promise}: Some promise.
• opts {Object}: Options passed directly to through2.
• returns {Stream}

Example

var promise2stream = require('promise2stream')
var promise = Promise.resolve(123)

var stream = promise2stream(promise)
stream
  .on('data', function (val) {
    console.log(val) // => 123
  })
  .once('error', console.error)
  .once('end', function () {
    console.log('end')
  })

// or access the promise
stream.promise.then(function (val) {
  console.log(val) // => 123
}, console.error)

// rejected promise fires `error` event
var rejectedPromise = Promise.reject(new Error('foo err'))
var stream = promise2stream(rejectedPromise)

stream.once('error', function (err) {
  console.log(err) // => [Error: foo err]
})

Related

• always-stream: Create stream from any value - function, array, string, buffer, promise, number,… more | homepage
• callback2stream: Transform sync, async or generator function to Stream. Correctly handle errors. homepage
• limon: The pluggable JavaScript lexer. Limon = Lemon. | homepage
• postcss: Tool for transforming styles with JS plugins | homepage
• posthtml: HTML/XML processor | homepage
• postjson: Transforming JSON with plugins. | homepage
• promise2thunk: Convert (transform) promise to thunk, just like was in co@3 | homepage
• stream-from-promise: Create streams from promises | homepage
• stream-to-promise: Convert streams (readable or writable) to promises | homepage
• through2: A tiny wrapper around Node streams2 Transform to avoid explicit subclassing noise | homepage
• thunk2promise: Transform or convert thunk to Bluebird Promise. | homepage
• value2stream: Transform any value to stream. Create stream from any value - string,… more | homepage

Contributing

Pull requests and stars are always welcome. For bugs and feature requests, please create an issue.
But before doing anything, please read the CONTRIBUTING.md guidelines.

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