Hono•5mo ago

import.meta.hot is undefined when using hono with bun.

I am trying to add a function to the dispose callback as documented here: https://bun.sh/docs/bundler/hmr?utm_source=chatgpt.com#import-meta-hot-api-reference but when I log import.meta there isn't even a hot property in there. I am using "hono": "^4.7.10" and bun 1.2.13. This is the script I am using to start the dev server : "dev": "bun run --hot src/index.ts"

Bun

Hot reloading – Bundler | Bun Docs

Update modules in a running application without reloading the page using import.meta.hot

14 Replies

ambergristle•5mo ago

Source code or it didn’t happen Also I’d recommend ditching chatgpt

Maston•5mo ago

nothing to do with hono, you're basically doing what the reference you linked is telling you not to do, for example you must use import.meta.hot.dispose(() => {...}) inline

WizzelOP•5mo ago

This is the code I am trying to use to unsubscribe from a websocket connection:

if (import.meta.hot) {
  import.meta.hot.dispose(() => {
    console.log("Cleaning up before hot reload..");
    unsubscribe();
  });
}

if (import.meta.hot) {
  import.meta.hot.dispose(() => {
    console.log("Cleaning up before hot reload..");
    unsubscribe();
  });
}

the the console.log() does never get executed even if I don't do the if (import.meta.hot) check. Thats why I console logged the meta object to see if "hot" even exists: console.log(import.meta) but it doesn't contain the hot property

ambergristle•5mo ago

hm. i assume you're running this localy?

WizzelOP•5mo ago

Correct

ambergristle•5mo ago

strange. it shouldn't be getting shaken out then i haven't worked w this api before though, so idk have you tried without the unsubscribe? i.e., just the log

WizzelOP•5mo ago

It also doesnt work without the unsubscribe. Does it matter where I place this listener? If its at the end of the file or not?

ambergristle•5mo ago

rip no idea. i wouldn't expect it to though

WizzelOP•5mo ago

Ok guess I manually restart the dev server then

ambergristle•5mo ago

what happens if you just hot reload w/o unsubscribing?

WizzelOP•5mo ago

The callback of my websocket gets called multiple times and the connections add every time I hot reload without unsubscribing

ambergristle•5mo ago

ah, i see if you share a minimal repro, i can mess around w it later today

WizzelOP•5mo ago

https://github.com/Wizzel1/hmr-dispose

ambergristle•5mo ago

i can repro, but still have no idea what the issue is i did notice that "HMR is enabled by default when using Bun's full-stack development server.", which is not how you have your project set up but setting up the full-stack server didn't help i'm wondering whether import.meta.hot is only available for client-side modules

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import.meta.hot is undefined when using hono with bun.

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