import 'isomorphic-fetch';
import Identifier from '../Identifier';
import IdentifierDocument from '../IdentifierDocument';
import IResolver from './IResolver';
import UserAgentOptions from '../UserAgentOptions';
/**
 * Fetches DID Documents from remote resolvers over http
 * @class
 * @implements Resolver
 */
export default class HttpResolver implements IResolver {
    url: string;
    options?: UserAgentOptions | undefined;
    private timeoutInMilliseconds;
    /**
     * Constructs an instance of the HttpResolver class.
     * @param url of the remote resolver.
     * @param [options] for configuring the resolver.
     */
    constructor(url: string, options?: UserAgentOptions | undefined);
    /**
     * Sends a fetch request to the resolver URL including the
     * specified identifier.
     * @param identifier to resolve.
     */
    resolve(identifier: Identifier): Promise<IdentifierDocument>;
}