/**
 * Converts modern SDK object type naming to legacy API naming.
 * Maps 'task' -> 'item' and 'comment' -> 'note' for API requests.
 * Other values pass through unchanged.
 *
 * @internal
 * @param objectType The object type using modern naming.
 * @returns The object type using legacy API naming.
 */
export declare function normalizeObjectTypeForApi(objectType: string | undefined): string | undefined;
/**
 * Converts legacy API object type naming to modern SDK naming.
 * Maps 'item' -> 'task' and 'note' -> 'comment' for SDK responses.
 * Other values pass through unchanged.
 *
 * @internal
 * @param objectType The object type using legacy API naming.
 * @returns The object type using modern SDK naming.
 */
export declare function denormalizeObjectTypeFromApi(objectType: string | undefined): string | undefined;
/**
 * Normalizes an `ActivityObjectEventType` filter string for the API,
 * converting modern object type names to legacy API names.
 * e.g. 'task:added' -> 'item:added', 'comment:' -> 'note:', ':deleted' -> ':deleted'
 *
 * @internal
 */
export declare function normalizeObjectEventTypeForApi(filter: string): string;