Hono starter application silently failing

[radu-matei]

I'm trying to use the Hono framework: https://hono.dev/docs/

From the starter TypeScript template, I ran npm install hono, then added the quickstart from the docs:

import { Hono } from 'hono'

const app = new Hono()

app.get('/', (c) => c.text('Hono!'))

export default app

spin build is successful, but running results in a silent failure:

curl localhost:3001 -v
* Host localhost:3001 was resolved.
* IPv6: ::1
* IPv4: 127.0.0.1
*   Trying [::1]:3001...
* connect to ::1 port 3001 from ::1 port 54069 failed: Connection refused
*   Trying 127.0.0.1:3001...
* Connected to localhost (127.0.0.1) port 3001
> GET / HTTP/1.1
> Host: localhost:3001
> User-Agent: curl/8.7.1
> Accept: */*
>
* Request completely sent off
< HTTP/1.1 500 Internal Server Error
< transfer-encoding: chunked
< date: Sat, 08 Feb 2025 01:40:15 GMT
<
* Connection #0 to host localhost left intact

ref #330 for the silent error, as nothing is logged in the component logs.

[radu-matei]

Manually calling app.fetch in the fetch event handler solved the issue:

import { Hono } from 'hono'

const app = new Hono()

app.get('/', (c) => c.text('Hono!'))


//@ts-ignore
addEventListener('fetch', async (event: FetchEvent) => { event.respondWith(app.fetch(event.request)) });

I think it would be incredibly helpful to handle the export default pattern as well.

[radu-matei]

Oh nice, just discovered the app.fire() pattern:

import { Hono } from 'hono'

const app = new Hono()

app.get('/', (c) => c.text('Hono!'))


app.fire()

[karthik2804]

@tschneidereit would it be possible to check if handlers are attached to the fetchEvent during wizer time? The issue here comes from us keeping the fetchEvent around if we do not explicitly implement the wasi-http export and failing to attach a handler to the event.