Where in the source is useState defined?

useState is defined in [packages/react/src/ReactHooks.js:L66-L72].

It's a hook that accepts an initial state and returns a dispatcher's useState implementation:

export function useState<S>(
  initialState: (() => S) | S,
): [S, Dispatch<BasicStateAction<S>>] {
  const dispatcher = resolveDispatcher();
  return dispatcher.useState(initialState);
}

The function resolves a dispatcher and delegates to its useState method, which handles the actual state management logic.

FOLLOW_UPS:

• How does resolveDispatcher() work?
• What are the other hooks in ReactHooks.js?
• How does useState handle functional vs object initializers?