/**
 * Enum representing different authentication schemes
 */
export declare enum AuthScheme {
    /** No authentication */
    NONE = "NONE",
    /** API key authentication */
    API_KEY = "API_KEY",
    /** Basic authentication with username and password */
    BASIC = "BASIC",
    /** OAuth 2.0 authentication */
    OAUTH2 = "OAUTH2",
    /** OpenID Connect authentication */
    OIDC = "OIDC",
    /** Google service account authentication */
    SERVICE_ACCOUNT = "SERVICE_ACCOUNT",
    /** Custom authentication mechanism */
    CUSTOM = "CUSTOM"
}