export interface ClientCredentialsResponse {
    token_type: string;
    expires_in: number;
    ext_expires_in: number;
    access_token: string;
}
export declare class ClientCredentials {
    private readonly tokenUrl;
    private readonly clientId;
    private readonly clientSecret;
    private readonly scope;
    private readonly resource;
    private readonly debugMode;
    private static accessToken;
    private static readonly grantType;
    /**
     * Create a new instance of the ClientCredentials class
     * @param tokenUrl - The URL to fetch the access token from
     * @param clientId - The client id
     * @param clientSecret - The client secret
     * @param scope - The scope of the access token
     * @param debugMode - Whether to log debug messages
     */
    constructor(tokenUrl: string, clientId: string, clientSecret: string, scope: string | undefined, resource: string | undefined, debugMode?: boolean);
    /**
     * Helper method to perform the client credentials flow and return the access token
     * This method will check for the existence of the token and if it is expired, it will fetch a new one
     * @returns {Promise<string>} - The access token
     */
    getAccessToken(): Promise<string>;
    /**
     * Fetch the client credentials from the token URL
     * @returns {Promise<ClientCredentialsResponse>} - The response from the token URL
     * @private
     */
    private fetchClientCredentials;
    /**
     * Check if the access token is expired
     * @returns {boolean} - Whether the access token is expired
     * @private
     */
    private isAccessTokenExpired;
}