import "whatwg-fetch";
import "@babel/polyfill";
export interface Headers {
    [key: string]: string;
}
export interface State {
    baseHeaders: Headers;
    baseUrl: string;
}
export default class BimFetch {
    state: State;
    constructor(url: string);
    /**
     * Set headers on every request using rest operators.
     * It will handle the case when headers already set needs to be changed.
     * Thanks to rest operators, newHeaders will overwrite old headers values.
     * @param  {Object}  newHeaders Custom headers to be used for the current request
     */
    setHeaders(newHeaders: Headers): void;
    /**
     * Set default url to be used when making fetch requests
     */
    setDefaultUrl(url: string): void;
    /**
     * Perform a GET request. Parameters are sent as an object and will be parsed and transformed
     * into a valid query
     */
    get(url: string, params?: any, headers?: Headers): Promise<any>;
    /**
     * Perform a POST request. Parameters are sent as an object.
     * @param  {String}  url          Relative or absolute URL of the request
     * @param  {Object}  [params={}]  Parameters to send with the request
     * @param  {Object}  [headers={}] Custom headers
     * @return {Promise}              Return a promise of the result.
     */
    post(url: string, bodyToTransform?: any, headers?: Headers): Promise<any>;
    /**
     * Perform a PUT request. Parameters are sent as an object.
     * @param  {String}  url          Relative or absolute URL of the request
     * @param  {Object}  [params={}]  Parameters to send with the request
     * @param  {Object}  [headers={}] Custom headers
     * @return {Promise}              Return a promise of the result.
     */
    put(url: string, bodyToTransform?: any, headers?: Headers): Promise<any>;
    /**
     * Perform a DELETE request. There should be no parameters to be sent.
     * @param  {String}  url          Relative or absolute URL of the request
     * @param  {Object}  [params={}]  Parameters to send with the request
     * @param  {Object}  [headers={}] Custom headers
     * @return {Promise}              Return a promise of the result.
     */
    delete(url: string, headers?: Headers): Promise<any>;
}