Stone.js - Pipeline

An implementation of the Chain of Responsibility (CoR) pattern tailored for modern JavaScript and TypeScript apps using the Continuum Architecture philosophy.

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Overview

The Pipeline class is a flexible processor of "passable" values through a series of configurable steps called pipes. Pipes can be functions, factory-generated handlers, or class instances. Pipelines can run synchronously or asynchronously, support custom hook events, and allow pipe resolution via a resolver for advanced dependency injection scenarios.

Installation

npm i @stone-js/pipeline
# or
yarn add @stone-js/pipeline
# or
pnpm add @stone-js/pipeline

Important

This package is pure ESM. Ensure your package.json includes "type": "module" or configure your bundler appropriately.

import { Pipeline } from '@stone-js/pipeline'

Quick Start

import { Pipeline } from '@stone-js/pipeline'

const addOne = (v, next) => next(v + 1)
const timesTwo = (v, next) => next(v * 2)

const result = Pipeline.create<number>()
  .send(1)
  .through(addOne, timesTwo)
  .sync()
  .thenReturn()

console.log(result) // Output: 4

Features

• Chain-of-responsibility execution
• Supports function, factory, and class-based pipes
• Works in both sync and async mode
• Custom resolver support
• Pipe lifecycle hooks via on()
• Priority-based execution order
• Type-safe with TypeScript, compatible with JavaScript

Usage Patterns

Synchronous Pipeline

const pipeline = Pipeline.create<number>()
  .send(2)
  .through([
    (v, next) => next(v + 3),
    (v, next) => next(v * 2)
  ])
  .sync()

const result = pipeline.thenReturn()
console.log(result) // Output: 10

Asynchronous Pipeline

const fetch = async (v, next) => next(await mockFetch(v))
const mockFetch = async (v) => new Promise(res => setTimeout(() => res(v * 10), 500))

const result = await Pipeline.create<number>()
  .send(5)
  .through(fetch)
  .thenReturn()

console.log(result) // Output: 50

Using .pipe() Incrementally

const result = Pipeline.create<number>()
  .send(1)
  .pipe(v => v + 1)
  .pipe(v => v * 5)
  .sync()
  .thenReturn()

console.log(result) // Output: 10

Resolver for Dependency Injection

class MyPipe {
  handle(v, next) {
    return next(`Resolved: ${v}`)
  }
}

const resolver = () => new MyPipe()

const result = Pipeline.create<string>({ resolver })
  .send('value')
  .through({ module: MyPipe, isClass: true })
  .sync()
  .thenReturn()

console.log(result) // Output: Resolved: value

Hooking Into Lifecycle

const pipeline = Pipeline.create<number>()
  .on('onProcessingPipe', ({ passable }) => console.log('Processing', passable))
  .on('onPipeProcessed', ({ passable }) => console.log('Processed', passable))
  .send(3)
  .through((v, next) => next(v + 2))
  .sync()

const result = pipeline.thenReturn()
console.log(result) // Output: 5

Factory and Class-Based Pipes

const factoryPipe = () => (v, next) => next(v + 2)

class CustomPipe {
  handle(v, next) {
    return next(v * 3)
  }
}

const result = Pipeline.create<number>()
  .send(1)
  .through(
    { module: CustomPipe, isClass: true },
    { module: factoryPipe, isFactory: true }
  )
  .sync()
  .thenReturn()

console.log(result) // Output: 9

Using .via() to Customize Method Name

class Pipe {
  transform(value, next) {
    return next(value + '!')
  }
}

const result = Pipeline.create<string>()
  .send('Wow')
  .through({ module: Pipe, isClass: true })
  .via('transform')
  .sync()
  .thenReturn()

console.log(result) // Output: Wow!

Priority-based Execution

const p1 = { module: (v, next) => next(v + 1), priority: 10 }
const p2 = { module: (v, next) => next(v * 2), priority: 20 }

const result = Pipeline.create<number>()
  .send(1)
  .through(p1, p2)
  .sync()
  .thenReturn()

console.log(result) // Output: 4 → (1 + 1) * 2

API

All methods are chainable:

• .send(passable)
• .through(...pipes)
• .pipe(...pipes)
• .sync(true|false)
• .via(methodName)
• .on(hookName, listener)
• .then(fn)
• .thenReturn()

Pipes can be:

• Function: (value, next) => next(...)
• Factory: () => (value, next) => next(...)
• Class: new MyPipe().handle(...)

Summary

The Pipeline class provides a powerful and flexible way to process values through a series of steps, allowing for both synchronous and asynchronous operations. It supports various types of pipes, including functions, factories, and classes, and offers lifecycle hooks for custom behavior during processing.

Learn More

This package is part of the Stone.js ecosystem, a modern JavaScript framework built around the Continuum Architecture.

Explore the full documentation: https://stonejs.dev

API documentation

• API

Contributing

See Contributing Guide

Credits

Inspired by Laravel's Pipeline