Function subscribe

packages/web/src/state.ts:41–46

(callback: (prevState: DeepReadonly<State>) => void)

const subscribers: Set<(state: DeepReadonly<State>) => void> = new Set();

export function subscribe(callback: (prevState: DeepReadonly<State>) => void): () => void {
  subscribers.add(callback);
  return () => {
    subscribers.delete(callback);
  };
}

export function updateState(updater: (draftState: State) => void): void {
  const prevState = state;