type TokenChangeCallback = (accessToken: string) => void;
/**
 * This helper allows updating the search token at any point in the SSR workflow—before or after
 * static state creation, and before or after hydration.
 */
export declare function createAccessTokenManager(initialToken: string): {
    /**
     * Gets the current access token.
     */
    getAccessToken(): string;
    /**
     * Sets the access token, updating both configuration and active engines.
     */
    setAccessToken(accessToken: string): void;
    /**
     * Registers a callback function to be invoked when the access token changes.
     * If there's a queued token, the callback will be invoked immediately.
     *
     * @param callback - Invoked with the new token on every subsequent change.
     * @param owner - The object whose lifetime bounds the subscription (the engine).
     * @returns An unsubscribe function that removes the callback immediately.
     */
    registerCallback(callback: TokenChangeCallback, owner: object): () => void;
};
export {};