export type ExternalStoreSubscribe = (listener: () => void) => () => void;
export type ExternalStoreSelectorOptions<T> = {
    /**
     * Equality function to keep returning the previous snapshot when semantically unchanged.
     * This prevents unnecessary re-renders when the selector creates new objects.
     */
    areEqual?: (a: T, b: T) => boolean;
};
/**
 * Select a derived value from an external store, optionally reusing the previous snapshot
 * when `areEqual(previous, next)` holds.
 */
export declare function useExternalStoreSelector<S, T>(subscribe: ExternalStoreSubscribe, getState: () => S, selector: (state: S) => T, options?: ExternalStoreSelectorOptions<T>): T;