export type CodeUpdaterEvent = {
    onProgress: {
        progress: number;
    };
};
export declare const addListener: <T extends keyof CodeUpdaterEvent>(eventName: T, listener: (event: CodeUpdaterEvent[T]) => void) => () => void;
/**
 * Downloads files from given URLs.
 *
 * @param {string} bundleId - identifier for the bundle id.
 * @param {string | null} zipUrl - zip file URL. If null, it means rolling back to the built-in bundle
 * @returns {Promise<boolean>} Resolves with true if download was successful, otherwise rejects with an error.
 */
export declare const updateBundle: (bundleId: string, zipUrl: string | null) => Promise<boolean>;
/**
 * Fetches the current app version.
 */
export declare const getAppVersion: () => Promise<string | null>;
/**
 * Reloads the app.
 */
export declare const reload: () => void;
/**
 * Fetches the current bundle version id.
 *
 * @async
 * @returns {Promise<string>} Resolves with the current version id or null if not available.
 */
export declare const getBundleId: () => string;