/**
 * Check if system keychain is available
 */
export declare function hasKeychainSupport(): Promise<boolean>;
/**
 * Get credentials from system keychain
 */
export declare function getKeychainCredentials(): Promise<{
    user: string;
    password: string;
} | null>;
/**
 * Save credentials to system keychain
 * @returns true if saved successfully, false otherwise
 */
export declare function saveToKeychain(user: string, password: string): Promise<boolean>;
/**
 * Clear credentials from system keychain
 */
export declare function clearKeychain(): Promise<void>;
export type CredentialSource = "environment" | "keychain" | "file" | null;
export interface Config {
    password?: string;
    user?: string;
}
/**
 * Load configuration from file
 */
export declare function loadConfig(): Config;
/**
 * Save configuration to file
 */
export declare function saveConfig(cfg: Config): void;
/**
 * Clear saved configuration from file
 */
export declare function clearConfigFile(): void;
/**
 * Clear saved configuration from all storage locations
 */
export declare function clearConfig(): Promise<void>;
/**
 * Get credentials from environment variables only (sync)
 */
export declare function getCredentialsFromEnv(): {
    user: string;
    password: string;
} | null;
/**
 * Get credentials from config file only (sync)
 */
export declare function getCredentialsFromFile(): {
    user: string;
    password: string;
} | null;
/**
 * Get credentials from environment variables, keychain, or config file
 * Priority: env vars → keychain → config file
 */
export declare function getCredentials(): Promise<{
    user: string;
    password: string;
    source: CredentialSource;
} | null>;
/**
 * Check if credentials are configured (sync check - env and file only)
 */
export declare function hasCredentialsSync(): boolean;
/**
 * Check if credentials are configured (async - includes keychain)
 */
export declare function hasCredentials(): Promise<boolean>;
/**
 * Interactive login prompt
 */
export declare function promptLogin(): Promise<{
    user: string;
    password: string;
}>;
/**
 * Get credentials, prompting if necessary
 */
export declare function requireCredentials(): Promise<{
    user: string;
    password: string;
}>;