koay-res Note: build express middleware compatible with Koa Installation Node >= 7.6 npm install --save koay-res Usage const compatRes = require('koay-res');const Koa = require('koa');const { middleware } = require('stylus');const app = new Koa();const fn = middleware( ... ); app.use(async (ctx, next) => { await new Promise((resolve, reject) => { fn(ctx.req, compatRes(ctx), (err) => { if (err) { reject(err); } else { resolve(); } }); }); await next();});