import AbortController from 'node-abort-controller';
/**
 * Simple Fetch wrapper that enables a timeout.
 * Allows for showing an error state for slow-to-load IPFS files
 */
export declare class FetchWithTimeout {
    controller: AbortController;
    expectedContentType?: string;
    timeoutDuration: number;
    constructor(timeoutDuration?: number, contentType?: string | undefined);
    fetch(url: string, options?: any): Promise<Response>;
}
export interface IFetchOptions {
    method?: string;
    timeoutMs?: number;
    responseRequiredContentType?: string;
    responseMaxLimitInBytes?: number;
}
export declare class FetchEror extends Error {
}
export declare class FetchDifferentContentTypeError extends FetchEror {
    constructor(actualContentType_: string);
    readonly actualContentType: string;
}
export declare class FetchContentLengthExceededLimitError extends FetchEror {
    constructor();
}
export declare class FetchStatusNotSuccessError extends FetchEror {
    constructor(status: number, statusText?: string);
    readonly status: number;
    readonly statusText?: string;
}
export declare function fetchEx(url: string, options_?: IFetchOptions): Promise<string>;