$ DEBUG=koa2-test:* npm start

> koa2-test@0.1.0 start /home/aubrey/tmp/koa2-test
> nodemon bin/run

[nodemon] 1.9.2
[nodemon] to restart at any time, enter `rs`
[nodemon] watching: *.*
[nodemon] starting `node bin/run`
2babel presets path = /home/aubrey/tmp/koa2-test/node_modules/
koa deprecated Support for generators will been removed in v3. See the documentation for examples of how to convert old middleware https://github.com/koajs/koa/tree/v2.x#old-signature-middleware-v1x app.js:23:5
  <-- GET /
GET / - 94ms
  --> GET / 200 110ms 49b
^C