Add size-limit config

[aryaemami59]

This PR:

• Adds size-limit config to monitor bundle size changes in preparation for any potential changes we'll have to make to migrate to React 19.

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[timdorr]

Honestly, I'm not a huge fan of these sorts of tools. They tend to be more annoying than helpful. Maybe we can limit it to just a react19 branch, so we don't have to tend to it after we complete that work?

Edit: Wait, don't we already have this? https://github.com/reduxjs/react-redux/blob/master/.github/workflows/size.yaml

[aryaemami59]

@timdorr

Honestly, I'm not a huge fan of these sorts of tools. They tend to be more annoying than helpful.

That's fair, but size-limit does give us an idea of how the changes that we make impact our bundle sizes. And with the way I setup the config, it can keep track of every single named export, in every single package entry point, in both development and production builds. And the config is simple enough that I hope we'd be able to insert into any one of the redux packages and it should just work.

Edit: Wait, don't we already have this? https://github.com/reduxjs/react-redux/blob/master/.github/workflows/size.yaml

While preactjs/compressed-size-action does give us some info about bundle size changes, it looks like it's only looking at dist/cjs/index.js and dist/react-redux.legacy-esm.js. It also doesn't look at named exports, or different environments.

The idea is to have this here so that if we were ever to make a set of changes, we could use it to keep an eye on bundle sizes, it doesn't necessarily have to put a "limit" on anything.

[EskiMojo14]

yeah, while I don't think the concept of a size "limit" is very useful, I do find it useful to have visibility on how a given set of changes affects final bundle size.

[timdorr]

Could this supplant our usage of compressed-size-action? That one hasn't been updated in a long time and causes some warnings in CI that will eventually turn into errors, so it's been on my radar to replace it.

[aryaemami59]

I guess we could use https://github.com/EskiMojo14/size-limit-action, same thing we're doing with RTK.