Hacking create react app to use preact
summary
Hacks replace react and react-dom with preact via modified react-scripts and webpack so the bundle shrinks dramatically while keeping the same JSX API; Jest needs a patched resolve and slightly different test setup, Babel requires a small tweak, and targets can be changed to IE11. Adds a tiny less watcher and the SubresourceIntegrity webpack plugin. Concrete outcomes include preact-compat replacement and 123KB → 38KB → 13KB bundle measurements and a link to the repo with the patches.
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