const app = require('koa')();
const converter = require("koa2-converter-middleware");
//此处为引用的express中间件,测试的webpack-dev-middleware版本为4.1.0
const middleware = require('webpack-dev-middleware');
const compiler = webpack({
  // webpack options
});
app.use(converter(middleware(compiler, {
    // webpack-dev-middleware options
})));

app.listen(3000, () => console.log('Example app listening on port 3000!'));