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hot-reloading.md

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Hot reloading

While a UIx component tree can be reloaded in a traditional way, by re-rendering from the root after reload, this resets component local state and re-runs hooks. It happens because the reloaded namespace will create new component functions, which in turn invalidate the UI tree when re-rendering after reload and cause the updated components to be re-mounted.

react-refresh makes it possible to reload components in a way that preserves local state and the state of hooks.

Setup for shadow-cljs

  1. Make sure you have React DevTools installed for your browser

  2. Install the package npm install react-refresh --save-dev

  3. Add uix.preload to :preloads so that it's only loaded in dev

;; shadow-cljs.edn
{:builds
 {:build-id
  {:devtools {:preloads [uix.preload]}}}}
  1. That's it. Now you can edit a UIx component, hit save, and once reloaded in the browser the local state should be preserved.

Things to look out for

Make sure that your UI is not re-rendered from the root in a traditional way when using fast-refresh, otherwise fast-refresh won't work and the state will be reset.