import { AuthenticatedRoute, ClientRequestAuth, HttpOptions, TokenType, Tokens } from '../providers';
/**
 * D4H API Authentication
 * =============================================================================
 * API requests are signed with an approprate bearer token. This service
 * determines the appropriate token based on the passed configuration and path.
 * Populates appropriate token if required by the API, based on config and URL.
 *
 *  1. Determine if route is authenticated.
 *  2. If token required, check whether the appropriate header has already been
 *     set in options. TeamService and PhotoService#membership both require
 *     this, because their methods employ the token of the passed team.
 *  3. Else if token required, try to fetch it.
 *  4. If token exists, set it as bearer header.
 *  5. If unable to fetch token, throw error.
 */
export declare class MissingTokenError extends Error {
    constructor(url: string);
}
export declare class AuthClient implements ClientRequestAuth {
    private readonly routes;
    constructor(routes: Array<AuthenticatedRoute>);
    bearerToken(tokens: Tokens, url: string, options?: HttpOptions): {
        Authorization: string;
    };
    getToken(tokens: Tokens, tokenType: TokenType): string;
    private tokenType;
}