Improve DX by implementing Hot Module Replacement (HMR) for React

[vladejs]

I think that adding HMR support to Meteor's build system will be an incredible feature, because it directly improves Developer's productivity.

I envy my colleagues that uses Next.js to build their frontend because, while I need to wait for a full page refresh, they just save changes and see results instantly.

[declank]

Ambiguous title in feature request (DX = developer experience).
Even if we didn't have HMR like in Webpack something like https://medium.com/@lucashansen/faster-meteor-reloads-62cca5b56460#55d2 would be welcome:

Most reloads are triggered by changing single files. If we make a fast path for these changes that performs minimal modifications to the existing bundles we could save a loootttt of time. For inspiration, modify something in .meteor/local/build/programs/web.browser/app/app.js (replace app with whatever the name of your project is) and do a hard refresh in your browser (so it reloads the page without using the cache). The change you made shows up instantly! Magic! Imagine if changing a file in your main app code just modified app.js and invalidated the browser cache. You could get <1 second reloads…

[loanlaux]

What's current status on this? I'm working on a very large Meteor project and would truly appreciate having HMR.

I recently worked on a Node project that had it, and I have to say it is a total game changer.

[aogaili]

+1 this is really needed we're having on average a 15 seconds refresh time

[aogaili]

The refresh time has been improved significantly with the latest meteor releases and the separation of Meteor client/server watchset.

However I do think this module.accept() API is useful to have and standardize in the bundlers ecosystem. Furthermore, the react team is working on implementing a more reliable fast refresh feature which is a good opportunity for Meteor to support hot reload out of the box.

[stolinski]

This is still a highly needed feature. For our setup, rebuilds are still sluggish.

[santiagopuentep]

Same for us, it's unbearable.