BroadcastChannel.onMessage() runs multi-times. Why?

[sinyo-matu]

Hi everyone.

I write BroadcastChannel.onMessage(handler) in my server.ts file.
And I expect the handler runs once on every message incoming.

But when an other BroadcastChannel instance (constructed in a route request hander) send one message,
the handler passed in onMessage() method runs at least three times.
And it will increase by 2 times by every hot reload.

Anybody know why this behavior happen?

[sinyo-matu]

It seems like this behavior is caused by dev mode.
When I ran deno task start this behavior disappeared!

[ije]

dev will re-import the server.ts with random query when it changes, the 'side effect' wouldn't be removed automatically