/**
 * Minimal representation of a query state. Matches Tanstack Query result.
 */
export interface Query {
    isLoading?: boolean;
    isError?: boolean;
    isSuccess?: boolean;
}
/**
 * Combines multiple query states into a single aggregated state.
 *
 * @returns Combined query state where:
 * - `isLoading` is true if any query is loading
 * - `isError` is true if any query has an error
 * - `isSuccess` is true only if all queries are successful
 *
 * @example
 * ```ts
 * const combinedState = combineQueries([
 *   { isLoading: true },
 *   { isSuccess: true }
 * ]);
 * // Result: { isLoading: true, isError: false, isSuccess: false }
 * ```
 */
export declare const combineQueries: (queries: Query[]) => {
    isLoading: boolean;
    isError: boolean;
    isSuccess: boolean;
};
/**
 * Parses an unknown error into a string message.
 * Handles various error formats including Error objects and plain strings.
 *
 * @example
 * ```ts
 * parseUnknownError(new Error("Something went wrong")); // "Something went wrong"
 * parseUnknownError("Custom error message"); // "Custom error message"
 * parseUnknownError({ message: "Object error" }); // "Object error"
 * parseUnknownError({}); // "Unknown error happened"
 * ```
 */
export declare const parseUnknownError: (error: unknown) => string;