vez

Middleware composition at new level. Ultimate alternative to ware, plugins, koa-compose and composition packages. Allows you to use callbacks, promises, generators and async/await functions as middlewares.

Install

npm i vez --save
npm test

Usage

For more use-cases see the tests

var vez = require('vez')
var assert = require('assert')
var Bluebird = require('bluebird')
 
vez()
  .use(Bluebird.resolve(123))
  .use(function () {
    assert.deepEqual(this, {a: 'b', c: 'd', e: 'f'})
    return Bluebird.resolve(456)
  })
  .use(function (foo, next) {
    assert.deepEqual(this, {a: 'b', c: 'd', e: 'f'})
    next(null, foo, 789)
  })
  .use(function * (first, second) {
    this.g = first + second
    assert.deepEqual(this, {a: 'b', c: 'd', e: 'f', g: 1245})
 
    // because generators are handled by `co@4.6`
    return yield {
      gens: this.g
    }
  })
  .run({a: 'b'}, {c: 'd'}, {e: 'f'}, function (err, res) {
    if (err) {
      return console.error(err)
    }
    assert.deepEqual(this, {a: 'b', c: 'd', e: 'f', g: 1245})
    assert.deepEqual(res, [123, 456, [ 456, 789 ], { gens: 1245 }])
    done()
  })

Contributing

Pull requests and stars are always welcome. For bugs and feature requests, please create an issue.
But before doing anything, please read the CONTRIBUTING.md guidelines.

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