'use strict'; const Koa = require('..'); const app = new Koa(); // number of middleware let n = parseInt(process.env.MW || '1', 10); let useAsync = process.env.USE_ASYNC === 'true'; console.log(` ${n}${useAsync ? ' async' : ''} middleware`); while (n--) { if (useAsync) { app.use(async(ctx, next) => await next()); } else { app.use((ctx, next) => next()); } } const body = Buffer.from('Hello World'); if (useAsync) { app.use(async(ctx, next) => { await next(); ctx.body = body; }); } else { app.use((ctx, next) => next().then(() => ctx.body = body)); } app.listen(3333);