/**
 * Performs IndieAuth metadata discovery.
 *
 * IndieAuth metadata adopts OAuth 2.0 Authorization Server Metadata [RFC8414],
 * with the notable difference that discovery of the URL happens via the IndieAuth link relation rather than the
 * `.well-known` discovery method specified by RFC8414.
 *
 * @see [IndieAuth Server Metadata](https://indieauth.spec.indieweb.org/#indieauth-server-metadata)
 * @see [OAuth 2.0 Authorization Server Metadata](https://www.rfc-editor.org/rfc/rfc8414)
 */
export declare const serverMetadata: (metadata_endpoint: string) => Promise<{
    error: Error;
    value?: undefined;
} | {
    value: {
        authorization_response_iss_parameter_supported?: boolean | undefined;
        code_challenge_methods_supported?: string[] | undefined;
        grant_types_supported?: ("authorization_code" | "implicit" | "password" | "client_credentials" | "refresh_token" | "urn:ietf:params:oauth:grant-type:jwt-bearer" | "urn:ietf:params:oauth:grant-type:saml2-bearer")[] | undefined;
        introspection_endpoint?: string | undefined;
        introspection_endpoint_auth_methods_supported?: string[] | undefined;
        introspection_endpoint_auth_signing_alg_values_supported?: string[] | undefined;
        jwks_uri?: string | undefined;
        op_policy_uri?: string | undefined;
        op_tos_uri?: string | undefined;
        registration_endpoint?: string | undefined;
        response_modes_supported?: ("fragment" | "query")[] | undefined;
        response_types_supported?: ("code" | "token")[] | undefined;
        revocation_endpoint?: string | undefined;
        revocation_endpoint_auth_methods_supported?: string[] | undefined;
        revocation_endpoint_auth_signing_alg_values_supported?: string[] | undefined;
        scopes_supported?: string[] | undefined;
        service_documentation?: string | undefined;
        token_endpoint_auth_methods_supported?: string[] | undefined;
        token_endpoint_auth_signing_alg_values_supported?: string[] | undefined;
        ui_locales_supported?: string[] | undefined;
        userinfo_endpoint?: string | undefined;
        authorization_endpoint: string;
        issuer: string;
        token_endpoint: string;
    };
    error?: undefined;
}>;
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