es-modular with koa

const Koa = require("koa"); const { bodyParser } = require("@koa/bodyparser"); const { modular, config } = require("es-modular"); function add(x, y) { return x + y; } function getHost($context) { return $context.request.hostname; } const app = new Koa(); app.use(bodyParser()); app.use((ctx, next) => { ctx.set('Access-Control-Allow-Origin', '*'); next(); }); app.use(modular({ add, getHost }, config.koa)); app.listen(3000);