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Read all data from a Readable stream at once with Promise

 5 years ago
source link: https://www.tuicool.com/articles/hit/yQRFZrF
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read-all

Read all data from a Readable stream and get notified when Promise is resolved.

Installation

Using npm:

$ npm install node-read-all

Using yarn:

$ yarn add node-read-all

Usage

const fs = require('fs');
const readAll = require('node-read-all');

const rStream = fs.createReadStream('file.txt');
rStream.setEncoding('utf8');
readAll(rStream)
  .then(data => console.log(data))
  .catch(console.error.bind(console));

When stream is in object mode:

const { Transform } = require('stream');
const readAll = require('node-read-all');

const transformStream = new Transform({
  readableObjectMode: true,
  transform(chunk, encoding, callback) {
    this.push({ value: chunk.toString() });
    callback();
  },
});

readAll(transformStream)
  .then(data => console.log(data))
  .catch(console.error.bind(console));

setTimeout(() => {
  transformStream.write('a');
  transformStream.write('b');
  transformStream.write('c');
  transformStream.end();
}, 1000);

Contributing

Your PRs and stars are always welcome.


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