HMR of server side with webpack / rspack

[felixmosh]

Prerequisites

• I have written a descriptive issue title
• I have searched existing issues to ensure the feature has not already been requested

🚀 Feature Proposal

Hi,
There is any way to hot module reload server side that is based on fastify? is it possible to replace fastify plugin with other module at runtime?

Motivation

Allowing hot module replacement of fastify plugins (routes / hooks etc) when the app is bundled with Webpack / Rspack.

Example

No response

[mcollina]

Not right now.
Platformatic offers an hot reloading solution without the use of bundlers.

Most maintainers of Fastify recommend to not bundle your server side code, so no one worked on this specific problem.

[felixmosh]

Can you share on how would you do that?

For Express, this line does the trick, https://github.com/felixmosh/rspack-express-js/blob/master/src/index.ts#L10

[mcollina]

Can you share on how would you do that?

I have no idea, it's likely 1-2 days of work to figure it out.