export declare namespace UrlUtil {
    function isValidRedirectUrl(url?: string): boolean | "" | undefined;
    /**
     * Decides if a URL is absolute based on whether it contains a valid scheme name, as
     * defined in RFC 1738.
     */
    function isAbsoluteUrl(url?: string): boolean;
    function getUrl(...paths: string[]): Promise<string>;
    function getPath(...paths: string[]): Promise<string>;
}
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