$ npm install trek-middleware --save

const co = require('co')
const Middleware = require('trek-middleware')
const middleware = new Middleware()

middleware.push((ctx, next) => {
  ctx.arr.push(1)
  return next().then(() => {
    ctx.arr.push(6)
  })
})

middleware.push(async (ctx, next) => {
  ctx.arr.push(2)
  await next()
  ctx.arr.push(5)
})

middleware.push(co.wrap(function * (ctx, next) {
  ctx.arr.push(3)
  yield next()
  ctx.arr.push(4)
}))

const ctx = { arr: [] }
middleware.compose(ctx).then(() => {
  console.log(ctx.arr.toString() === '1,2,3,4,5,6')
})

1024 middlewares
koa-compose x 777 ops/sec ±1.91% (75 runs sampled)
trek-middleware x 829 ops/sec ±2.95% (82 runs sampled)
Fastest is trek-middleware