Where in the source is useState defined?

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

The implementation is straightforward:

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

It retrieves a dispatcher via resolveDispatcher() and delegates to the dispatcher's useState method, which handles the actual state management logic.

FOLLOW_UPS:

• What does resolveDispatcher() do internally?
• How does the dispatcher implement useState?
• Where are other React hooks defined?