throwback

Throwback

An asynchronous middleware pattern.

Installation

npm install throwback --save

Usage

Compose asynchronous functions (promise-based)

import { compose, resolve } from 'throwback'

const fn = compose([
  async function (req, res, next) {
    console.log(1)

    try {
      await next()
    } catch (err) {
      console.log('throwback', err)
    }

    console.log(4)
  },
  async function (req, res, next) {
    console.log(2)

    return next()
  }
])

// Or replace the callback here with `resolve`, which returns
// `Promise.resolve()` triggering the bubble back up the middleware stack.
fn({}, {}, function (req, res) {
  console.log(3)

  res.status = 404
})

Inspiration

Built for popsicle and inspired by koa-compose.

License

MIT