/**
 * Shared helpers for viewer-server routes.
 */
/**
 * Parse a JSON string that should be an array of strings.
 * Returns an empty array on null, invalid JSON, or non-array values.
 * Mirrors Python's store._safe_json_list().
 */
export declare function safeJsonList(raw: string | null | undefined): string[];
/**
 * Parse a query parameter as an integer, returning the default on failure.
 */
export declare function queryInt(value: string | undefined, defaultValue: number): number;
/**
 * Parse a query parameter as a boolean flag.
 * Recognizes "1", "true", "yes" as truthy.
 */
export declare function queryBool(value: string | undefined): boolean;
//# sourceMappingURL=helpers.d.ts.map