import { HttpError } from '@curveball/http-errors';
interface OAuth2Error extends HttpError {
    errorCode: string;
}
export declare function isOAuth2Error(err: Error): err is OAuth2Error;
/**
 * The request is missing a required parameter, includes an invalid parameter
 * value, includes a parameter more than once or is otherwise malformed.
 */
export declare class InvalidRequest extends Error implements OAuth2Error {
    httpStatus: number;
    errorCode: string;
}
/**
 * The client is not authorized to request an authorization code using this
 * method
 */
export declare class UnauthorizedClient extends Error implements OAuth2Error {
    httpStatus: number;
    errorCode: string;
}
/**
 * The resource owner or authorization server denied the request
 */
export declare class AccessDenied extends Error implements OAuth2Error {
    httpStatus: number;
    errorCode: string;
}
/**
 * The authorization server does not support obtaining an authorization code
 * using this method
 */
export declare class UnsupportedResponseType extends Error implements OAuth2Error {
    httpStatus: number;
    errorCode: string;
}
/**
 * The requested scope is invalid, unknown or malformed
 */
export declare class InvalidScope extends Error implements OAuth2Error {
    httpStatus: number;
    errorCode: string;
}
/**
 * Client authentication failed (e.g., unknown client, no client authentication
 * included, or unsupported authentication method).  The authorization server
 * MAY return an HTTP 401 (Unauthorized) status code to indicate which HTTP
 * authentication schemes are supported.  If the client attempted to
 * authenticate via the "Authorization" request header field, the authorization
 * server MUST respond with an HTTP 401 (Unauthorized) status code and include
 * the "WWW-Authenticate" response header field matching the authentication
 * scheme used by the client.
 */
export declare class InvalidClient extends Error implements OAuth2Error {
    httpStatus: number;
    errorCode: string;
}
/**
 * The provided authorization grant (e.g., authorization code, resource owner
 * credentials) or refresh token is invalid, expired, revoked, does not match
 * the redirection URI used in the authorization request, or was issued to
 * another client.
 */
export declare class InvalidGrant extends Error implements OAuth2Error {
    httpStatus: number;
    errorCode: string;
}
/**
 * The authorization grant type is not supported by the authorization server.
 */
export declare class UnsupportedGrantType extends Error implements OAuth2Error {
    httpStatus: number;
    errorCode: string;
}
/**
 * The authorization server encountered an unexpected condition that prevented
 * it from fulfilling the request. (This error code is needed because a 500
 * Internal Server Error HTTP status code cannot be returned to the client via
 * an HTTP redirect.)
 */
export declare class ServerError extends Error implements OAuth2Error {
    httpStatus: number;
    errorCode: string;
}
/**
 * The authorization server is currently unable to handle the request due to a
 * temporary overloading or maintenance of the server.  (This error code is
 * needed because a 503 Service Unavailable HTTP status code cannot be returned
 * to the client via an HTTP redirect.)
 */
export declare class TemporarilyUnavailable extends Error implements OAuth2Error {
    httpStatus: number;
    errorCode: string;
}
export {};