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stream-splicer

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stream-splicer

streaming pipeline with a mutable configuration


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916K
increased by3.16%
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What is stream-splicer?

The stream-splicer npm package allows you to create a stream that can be dynamically spliced with other streams. This is particularly useful for building complex streaming pipelines where you need to insert, remove, or replace streams on the fly.

What are stream-splicer's main functionalities?

Dynamic Stream Splicing

This feature allows you to dynamically splice streams into a pipeline. In this example, a through stream is created that converts input to uppercase. The stream-splicer package is used to create a stream pipeline that can be dynamically modified.

const splicer = require('stream-splicer');
const through = require('through2');

const stream = splicer([
  through(function (chunk, enc, callback) {
    this.push(chunk.toString().toUpperCase());
    callback();
  })
]);

stream.write('hello');
stream.write('world');
stream.end();

stream.pipe(process.stdout);

Inserting Streams

This feature allows you to insert new streams into an existing pipeline. In this example, a new stream is inserted that reverses the input string.

const splicer = require('stream-splicer');
const through = require('through2');

const stream = splicer([
  through(function (chunk, enc, callback) {
    this.push(chunk.toString().toUpperCase());
    callback();
  })
]);

const newStream = through(function (chunk, enc, callback) {
  this.push(chunk.toString().split('').reverse().join(''));
  callback();
});

stream.splice(1, 0, newStream);

stream.write('hello');
stream.write('world');
stream.end();

stream.pipe(process.stdout);

Removing Streams

This feature allows you to remove streams from an existing pipeline. In this example, the second stream that reverses the input string is removed from the pipeline.

const splicer = require('stream-splicer');
const through = require('through2');

const stream = splicer([
  through(function (chunk, enc, callback) {
    this.push(chunk.toString().toUpperCase());
    callback();
  }),
  through(function (chunk, enc, callback) {
    this.push(chunk.toString().split('').reverse().join(''));
    callback();
  })
]);

stream.splice(1, 1);

stream.write('hello');
stream.write('world');
stream.end();

stream.pipe(process.stdout);

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Package last updated on 24 May 2019

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