/**
 * Cross-platform secure credential storage
 */
export declare class KeychainManager {
    /**
     * Store API key securely in system keychain
     */
    setApiKey(apiKey: string): Promise<void>;
    /**
     * Retrieve API key from system keychain
     */
    getApiKey(): Promise<string | null>;
    /**
     * Delete API key from keychain
     */
    deleteApiKey(): Promise<void>;
    private setMacOSKeychain;
    private getMacOSKeychain;
    private setLinuxSecret;
    private getLinuxSecret;
    private setWindowsCredential;
    private getWindowsCredential;
}
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