const Koa = require('koa')
const Router = require('@koa/router')

class MyRouter extends Router {
    routes() {
        console.log(this.stack)
        return super.routes()
    }
}

const router = new MyRouter()
router.get('/', async (ctx, next) => {
    ctx.body = 'default middleware'
})
router.get('/', async (ctx, next) => {
    ctx.body = 'my middleware'
})

const app = new Koa()
app.use(router.routes())
app.listen(3000)