JSer.dev jser.dev

Try out React 19 in ESM without build tools

jser.dev·84w

React Internals Explorer - easily see how React works

jser.dev·86w

Deeper Dive Into React - React course by JSer

jser.dev·92w

Deeper Dive Chrome Extension - Enhance React.dev

jser.dev·98w

How does useOptimistic() work internally in React?

jser.dev·99w

How does use() work internally in React?

jser.dev·100w

Babel macro:`runCodeForEnvVar()` - run code conditionally on env var.

jser.dev·110w

The Internals of Styled Components

jser.dev·121w

Migrate TypeScript Code Progressively

jser.dev·124w

How UnoCSS works internally with Vite?

jser.dev·125w

Spread operator in TypeScript is not sound!!

jser.dev·130w

A real example of concurrent mode in Shaku - switch to `useDeferredValue()` instead of throttling or debouncing.

jser.dev·130w

Introducing Shaku Snippet - generate code screenshot with annotation

jser.dev·131w

When do useEffect() callbacks get run? Before paint or after paint?

jser.dev·131w

How useSyncExternalStore() works internally in React?

jser.dev·132w

How forwardRef() works internally in React?

jser.dev·133w

How lazy() works internally in React?

jser.dev·133w

How does React re-render internally?

jser.dev·134w

How does React do the initial mount internally?

jser.dev·135w

How does React work under the hood ? The Overview of React internals

jser.dev·135w

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