import { ApolloLink, Operation, FetchResult, Observable, NextLink } from 'apollo-link';
export declare class UploadLink extends ApolloLink {
    constructor();
    request(operation: Operation, forward?: NextLink): Observable<FetchResult> | null;
}
export declare const createUploadLink: ({ uri: fetchUri, fetch: linkFetch, }?: {
    uri?: string;
    fetch?: typeof fetch;
}) => ApolloLink;