import type { AuthenticationType, Destination } from './destination';
/**
 * @internal
 * Get an authentication header from given custom headers.
 * @param authenticationType - The authentication type of a destination
 * @param customHeaders - Custom headers.
 * @returns An authentication header.
 */
export declare function getAuthHeader(authenticationType: AuthenticationType | undefined, customHeaders?: Record<string, any>): AuthenticationHeaderOnPrem | AuthenticationHeaderCloud | undefined;
/**
 * @internal
 * @param username - The username
 * @param password - The password
 * @returns basic header as string
 */
export declare function basicHeader(username: string, password: string): string;
interface AuthenticationHeaderCloud {
    authorization: string;
}
interface AuthenticationHeaderOnPrem {
    'SAP-Connectivity-Authentication': string;
}
interface AuthenticationHeaders {
    authorization?: string;
    'Proxy-Authorization'?: string;
    'SAP-Connectivity-Authentication'?: string;
}
/**
 * @param destination - Destination from which headers are build
 * @param customAuthHeader - Additional custom headers
 * @returns authorization - headers build from destination
 * @internal
 */
export declare function buildAuthorizationHeaders(destination: Destination): Promise<AuthenticationHeaders>;
export {};