Pipeline.js

Laravel's Pipeline in JS form

Installation

npm install @zacksmash/pipeline.js

Usage

Import the Pipeline class and create a new instance of it.

import Pipeline from '@zacksmash/pipeline.js'

const pipeline = new Pipeline()

pipeline.send('foo')
  .through([
    (value, next) => next(value + 'bar'),
    (value, next) => next(value + 'baz')
  ])
  .then((value) => {
    console.log(value) // foobarbaz
  })

Methods

send()

The send() method is used to send a value through the pipeline.

let value = 'foo'

pipeline.send(value)

through()

The through() method is used to define the pipeline's steps. This can be an anonoymous function or lambda. You may also use a JS Class, with a handle() method (this can be overridden with the via() method). You may choose to use a static method to handle the value, or an instance method.

// Lambda, Anonoymous function
const pipeTwo = (value, next) => next(value + 'baz')

// Class
class PipeThree {
  handle(value, next) {
    return next(value + 'qux')
  }
}

// Static method
class PipeFour {
  static handle(value, next) {
    return next(value + 'quux')
  }
}

pipeline.send('foo')
  .through([
    pipeOne,
    pipeTwo,
    new PipeThree,
    PipeFour
  ])

pipe()

The pipe() method is used to define a single step in the pipeline.

pipeline.send('foo')
  .pipe((value, next) => next(value + 'bar'))
  .pipe((value, next) => next(value + 'baz'))
  .then((value, next) => {
    console.log(value) // foobarbaz
  })

via()

The via() method is used to define the method to call on a class. This is useful if you want to use a class, but don't want to use the handle() method. For example, if you want to use a class with a process() method:

class PipeFive {
  process(value, next) {
    return next(value + 'quuz')
  }
}

pipeline.send('foo')
  .through([
    new PipeFive
  ])
  .via('process')

then()

The then() method is used to define the callback to run after the pipeline has finished.

pipeline.send('foo')
  .through([
    (value, next) => next(value + 'bar'),
    (value, next) => next(value + 'baz')
  ])
  .then((value) => {
    console.log(value) // foobarbaz
  })

thenReturn()

The thenReturn() method is used to return the value after the pipeline has finished.

const result = pipeline.send('foo')
  .through([
    (value, next) => next(value + 'bar'),
    (value, next) => next(value + 'baz')
  ])
  .thenReturn()

console.log(result) // foobarbaz

License

MIT