koa-router behaves different in Deno

Trying to run following script

import Koa from 'koa/lib/application';
import KoaRouter from '@koa/router';

const app = new Koa({});
const router = new KoaRouter();

app.use(router.routes())
router.get("/", (ctx, next) => {
  ctx.type = "text/javascript"
  ctx.body = "console.log('hello')"
})

app.listen(2000)

import Koa from 'koa/lib/application';
import KoaRouter from '@koa/router';

const app = new Koa({});
const router = new KoaRouter();

app.use(router.routes())
router.get("/", (ctx, next) => {
  ctx.type = "text/javascript"
  ctx.body = "console.log('hello')"
})

app.listen(2000)

With Node.js,
request http://127.0.0.1:2000/http://127.0.0.1:2000/ gives me console.log('hello')console.log('hello') with Content-TypeContent-Type set to text/javascripttext/javascript.

But with Deno,
request the same url, gives console.log('hello')console.log('hello'), but the Content-TypeContent-Type is set to text/plaintext/plain. Then, your browser will refuse to execute the script if the Content-TypeContent-Type is not correct. And everything is broken.

I can't simply switch to Oakserver, this is just a minimal repro. In fact, the actual project is so large and coupled with Koa deeply.

Also ctx.typectx.type works correctly without koa-routerkoa-router. I don't know what is going on underlying koa-routerkoa-router

Trying to run following script

import Koa from 'koa/lib/application';
import KoaRouter from '@koa/router';

const app = new Koa({});
const router = new KoaRouter();

app.use(router.routes())
router.get("/", (ctx, next) => {
  ctx.type = "text/javascript"
  ctx.body = "console.log('hello')"
})

app.listen(2000)

import Koa from 'koa/lib/application';
import KoaRouter from '@koa/router';

const app = new Koa({});
const router = new KoaRouter();

app.use(router.routes())
router.get("/", (ctx, next) => {
  ctx.type = "text/javascript"
  ctx.body = "console.log('hello')"
})

app.listen(2000)

koa-router behaves different in Deno

koa-router behaves different in Deno

Continue the conversation

Deno

Continue the conversation

Deno

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