Introduction to flush-write-stream

The flush-write-stream is a robust and highly efficient library for stream operations in Node.js. It extends the functionalities of the native writable stream, providing a more controlled and manageable way to handle stream data, including flush capability, which is often crucial for ensuring data integrity and consistency.

API Examples for flush-write-stream

Below are several examples demonstrating how to utilize the various APIs provided by flush-write-stream:

Basic Usage

const { createWriteStream } = require('flush-write-stream');

const ws = createWriteStream((chunk, enc, cb) => {
  console.log('Received chunk:', chunk.toString());
  cb();
});

ws.write('Hello, World!');
ws.end('Goodbye, World!');

Implementing a Flush Function

const { createWriteStream } = require('flush-write-stream');

const ws = createWriteStream(
  (chunk, enc, cb) => {
    console.log('Chunk:', chunk.toString());
    cb();
  },
  function flush(cb) {
    console.log('Flushing...');
    cb();
  }
);

ws.write('Hello, Universe!');
ws.end('See you, Universe!');

Using with Promisified Version

const { createWriteStream } = require('flush-write-stream');
const { promisify } = require('util');

const asyncWrite = promisify((chunk, enc, cb) => {
  console.log('Chunk:', chunk.toString());
  cb();
});

const asyncFlush = promisify(cb => {
  console.log('Flushing...');
  cb();
});

const ws = createWriteStream(asyncWrite, asyncFlush);

async function run() {
  await ws.write('Promisified Hello!');
  await ws.end('Promisified Goodbye!');
}

run();

The following example shows an application that reads from a readable stream and writes to a writeable stream using flush-write-stream:

Application Example

const { createReadStream } = require('fs');
const { createWriteStream } = require('flush-write-stream');

const rs = createReadStream('./input.txt');
const ws = createWriteStream((chunk, enc, cb) => {
  console.log('Writing:', chunk.toString());
  cb();
});

rs.pipe(ws);

ws.on('finish', () => {
  console.log('Write completed');
});

In this example, we use flush-write-stream to handle data writing in a controlled manner, ensuring that all chunks are processed before the stream is closed.

By mastering flush-write-stream and its APIs, you can efficiently manage data handling in your Node.js applications, ensuring data integrity, consistency, and performance.

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