/**
 * Helper class that builds URLs from a baseUrl and given query parameters
 */
export declare class UrlBuilder {
    url: string;
    hasQuery: boolean;
    /**
     * Static method that creates an URL query string from a key, value pair provided as param     *
     * @param param either a string or a number to be converted.
     */
    static stringifyQuery(values: {
        [key: string]: string | number | string[] | undefined;
    }): string;
    /**
     * Static method that converts the parameter to a string
     *
     * @param param either a string or a number to be converted.
     */
    static toString(param: string | number): string;
    private static appendQueryString;
    /**
     * Default constructor.
     *
     * @param url The base URL.
     * @param hasQuery Whether the base URL already contains query parameters.
     */
    constructor(url: string, hasQuery?: boolean);
    /**
     * Appends a query parameter to the URL, either using '&key=value' or '?key=value'
     * depending on the [[hasQuery]] parameter.
     *
     * Escapes all strings using `encodeURIComponent`, except for the comma,
     * which is kept unescaped as a list separator.
     *
     * String arrays are concatenated using commas.
     *
     * @param key The key of the query parameter.
     * @param value The value of the query parameter.
     */
    appendQuery(key: string, value?: string | number | boolean | string[] | number[], operator?: string): void;
}
export interface RequestOptions {
    method?: string;
    body?: string;
    headers?: {
        [header: string]: string;
    };
}
/**
 * Abstract class used for building requests to a REST API.
 */
export declare abstract class RequestBuilder {
    readonly baseUrl: string;
    /**
     * Constructs a new RequestBuilder.
     *
     * @param baseUrl The base URL of the service.
     */
    constructor(baseUrl: string);
    /**
     * Helper method to download the resource.
     *
     * @param urlObj the URL to fetch.
     */
    request<T>(urlObj: UrlBuilder, init?: RequestOptions): Promise<T>;
    /**
     * Helper method to download the resource.
     *
     * @param urlObj the URL to fetch.
     */
    requestBlob(urlObj: UrlBuilder, init?: RequestOptions): Promise<Response>;
    /**
     * Implement this function to download the given url as JSON object.
     *
     * @param url The URL to download.
     */
    abstract download<T>(url: string, init?: RequestOptions): Promise<T>;
    /**
     * Implement this function to download the given url as Blob object.
     *
     * @param url The URL to download.
     */
    abstract downloadBlob(url: string, init?: RequestOptions): Promise<Response>;
}