koa-twurple.js

import { EventSubMiddleware } from '@twurple/eventsub'

import Koa from 'koa'
import KoaRouter from 'koa-router'

const app = new Koa
const router = new KoaRouter

const middleware = new EventSubMiddleware('...')

const middlewareHandlerWrapper = method => (path, handler) => {
	router[method](path, (context, next) => {
		context.req.params = context.params
		return handler(context.req, context.res, next)
	})
}

middleware.apply({
	get: middlewareHandlerWrapper('get'),
	post: middlewareHandlerWrapper('post'),
})

app.use(router.routes())
app.use(router.allowedMethods())

app.listen(process.env.PORT ?? 3000)