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readable-stream

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readable-stream

Streams3, a user-land copy of the stream library from Node.js


Version published
Weekly downloads
154M
increased by2.78%
Maintainers
3
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Created

What is readable-stream?

The readable-stream package is a userland stream module, compatible with the built-in stream module provided by Node.js. It offers the same interface and functionality as the native module, but with additional updates and bug fixes. It is particularly useful for ensuring consistent stream behavior across different Node.js versions.

What are readable-stream's main functionalities?

Creating a readable stream

This feature allows you to create a readable stream that you can pipe to other streams or consume manually. The 'read' method is called when the stream wants to pull more data.

const { Readable } = require('readable-stream');
const myReadableStream = new Readable({
  read(size) {
    this.push('some data');
    this.push(null); // No more data
  }
});
myReadableStream.on('data', (chunk) => {
  console.log(chunk.toString());
});

Creating a writable stream

This feature allows you to create a writable stream where you can write data. The 'write' method is called when the stream receives data to write.

const { Writable } = require('readable-stream');
const myWritableStream = new Writable({
  write(chunk, encoding, callback) {
    process.stdout.write(chunk);
    callback();
  }
});
process.stdin.pipe(myWritableStream);

Creating a transform stream

This feature allows you to create a transform stream that can modify data as it is read from a readable stream before it is written to a writable stream.

const { Transform } = require('readable-stream');
const myTransformStream = new Transform({
  transform(chunk, encoding, callback) {
    this.push(chunk.toString().toUpperCase());
    callback();
  }
});
process.stdin.pipe(myTransformStream).pipe(process.stdout);

Creating a duplex stream

This feature allows you to create a duplex stream that is both readable and writable. It can be used to read data from one source and write to another.

const { Duplex } = require('readable-stream');
const myDuplexStream = new Duplex({
  read(size) {
    this.push('data from read method');
    this.push(null);
  },
  write(chunk, encoding, callback) {
    console.log(chunk.toString());
    callback();
  }
});
myDuplexStream.on('data', (chunk) => {
  console.log(chunk.toString());
});
myDuplexStream.write('data for write method');

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Package last updated on 10 Mar 2023

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