/**
 * Manages OAuth2 client credentials authentication with Sophos Central.
 * Handles token acquisition and transparent refresh before expiry.
 */
export declare class TokenManager {
    private clientId;
    private clientSecret;
    private accessToken;
    private expiresAt;
    private refreshPromise;
    constructor(clientId: string, clientSecret: string);
    /**
     * Returns a valid access token, refreshing if needed.
     * Deduplicates concurrent refresh requests.
     */
    getToken(): Promise<string>;
    private fetchToken;
}
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