/**
 * An error thrown when duplicate parameters are detected in a route.
 * Param names must be unique. This includes params defined in a path
 * parent and params defined in the query.
 * @group Errors
 */
export declare class DuplicateParamsError extends Error {
    /**
     * Constructs a new DuplicateParamsError instance with a message indicating the problematic parameter.
     * @param paramName - The name of the parameter that was duplicated.
     */
    constructor(paramName: string);
}