/**
 * Azure AD Authentication Provider
 *
 * Handles Azure Active Directory authentication.
 * Supports OAuth2 client credentials flow with Azure AD.
 */
import { AuthProvider, AuthResult, AzureADConfig } from './index.js';
export declare class AzureADProvider implements AuthProvider<AzureADConfig> {
    readonly type: "azure_ad";
    authenticate(config: AzureADConfig): Promise<AuthResult>;
    refresh(config: AzureADConfig): Promise<AuthResult>;
    clear(config: AzureADConfig): Promise<void>;
    validate(config: AzureADConfig): Promise<boolean>;
    private getCacheKey;
}