import { IContext, IResponse } from 'requete';
import { Adapter } from './Adapter';
export interface IProgressEvent {
    loaded: number;
    total?: number;
    progress?: number;
    bytes: number;
    rate?: number;
    estimated?: number;
    upload?: boolean;
    download?: boolean;
    event?: any;
}
export type XhrAdapterOptions = {
    onDownloadProgress?(e: IProgressEvent): void;
    onUploadProgress?(e: IProgressEvent): void;
};
export declare class XhrAdapter extends Adapter {
    private options?;
    static readonly supported: boolean;
    constructor(options?: XhrAdapterOptions | undefined);
    private transformRequest;
    private transformResponse;
    request(ctx: IContext): Promise<IResponse<any>>;
}