CSS modules yes, CSS-in-JS no. Using SCSS modules gives you same encapsulation you get with CSS-in-JS while offloading main thread. Sure, there's Lerna and similar libs that compile to CSS but they just add unnecessary complexity to the build system.
If you use memoization too much something's wrong.
Don't use state libs unless your app really needs them.
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Discussion on: Bad Habits of Mid-Level React Developers
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