/**
 * Gets normalized URLs (absolute and relative) for redirect lookup.
 *
 * Normalizes the provided URL by removing trailing slashes and optionally filtering query parameters
 * based on a whitelist. This prepares the URL for use in redirect lookups.
 *
 * @param url The incoming URL.
 * @param queryParamWhitelist A set of query parameters to include in the lookup URL. Other parameters will be removed.
 *
 * @returns An object containing the relative and absolute normalized URLs.
 */
export declare function getRedirectLookupUrls(url: URL, queryParamWhitelist?: Set<string>): {
    relativeSourceUrl: string;
    absoluteSourceUrl: string;
};
/**
 * Constructs a target URL for redirection, handling relative and absolute URLs and query parameters.
 *
 * Copies query parameters from the source URL to the target URL, unless they are present in the
 * `queryParamWhitelist`. If the target is a relative URL, it uses the source URL as the base.
 *
 * @param source The source URL.
 * @param target The target redirect URL (can be relative or absolute).
 * @param queryParamWhitelist A set of query parameters to exclude from the final redirect URL.
 *
 * @returns The decoded target URL string.
 */
export declare function getTargetLocation(source: URL, target: string, queryParamWhitelist?: Set<string>): string;