/**
 * Appends an ID to a space-separated string of IDs, avoiding duplicates.
 * @param ids - The current space-separated string of IDs (or undefined/null)
 * @param idToAdd - The ID to append
 * @returns The updated space-separated string of IDs
 * @example
 * signal.value = appendId(signal.value, "rs7y2l0-error")
 * // "rs7y2l0-description" -> "rs7y2l0-description rs7y2l0-error"
 */
export declare function appendId(ids: string | undefined | null, idToAdd: string): string;
/**
 * Removes an ID from a space-separated string of IDs.
 * @param ids - The current space-separated string of IDs (or undefined/null)
 * @param idToRemove - The ID to remove
 * @returns The updated space-separated string of IDs, or undefined if the result is empty
 * @example
 * signal.value = removeId(signal.value, "rs7y2l0-error")
 * // "rs7y2l0-description rs7y2l0-error" -> "rs7y2l0-description"
 */
export declare function removeId(ids: string | undefined | null, idToRemove: string): string | undefined;
/**
 * Toggles an ID in a space-separated string of IDs.
 * @param ids - The current space-separated string of IDs (or undefined/null)
 * @param idToToggle - The ID to toggle
 * @returns The updated space-separated string of IDs
 * @example
 * signal.value = toggleId(signal.value, "rs7y2l0-error")
 * // "rs7y2l0-description" -> "rs7y2l0-description rs7y2l0-error"
 * // "rs7y2l0-description rs7y2l0-error" -> "rs7y2l0-description"
 */
export declare function toggleId(ids: string | undefined | null, idToToggle: string): string | undefined;