export interface UpworkTokens {
    access_token: string;
    refresh_token: string;
    expires_in: number;
    token_type: string;
    obtained_at: string;
}
export declare class CredentialManager {
    private readonly SERVICE_NAME;
    private readonly CONFIG_DIR;
    private readonly CONFIG_FILE;
    private readonly ENCRYPTION_KEY_FILE;
    private keytar;
    private isKeytarAvailable;
    private initPromise;
    private encryptionKey;
    constructor();
    private initialize;
    private initializeEncryptionKey;
    private encrypt;
    private decrypt;
    private ensureInitialized;
    private getKeychainKey;
    saveTokens(tokens: UpworkTokens, accountType?: 'freelancer' | 'agency'): Promise<void>;
    private saveToFile;
    private loadFromFile;
    loadTokens(accountType?: 'freelancer' | 'agency'): Promise<UpworkTokens | null>;
    private stripMetadata;
    clearTokens(accountType?: 'freelancer' | 'agency'): Promise<void>;
    isAvailable(): Promise<boolean>;
    getTokenAge(accountType?: 'freelancer' | 'agency'): Promise<number | null>;
}
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