import { AxiosInstance } from 'axios';
export declare type AxiosSingletonConfiguration = {
    isLogging?: boolean;
};
export declare class AxiosSingleton {
    private static _axiosInstance;
    private static _isLogging;
    /**
     * Get the singleton instance of Axios.
     * @param configuration - Configuration object for AxiosSingleton.
     *
     * @returns The Axios instance.
     */
    static getInstance(configuration?: AxiosSingletonConfiguration): AxiosInstance;
    /**
     * Initialize the request interceptor.
     */
    private static _initializedRequestInterceptor;
    /**
     * Initialize the response interceptor.
     */
    private static _initializedResponseInterceptor;
    /**
     * Handle the request before it is sent.
     *
     * @param request - The Axios request configuration.
     * @param isLogging - Whether logging is enabled.
     *
     * @returns The modified request configuration.
     */
    private static _handleRequest;
    /**
     * Handle the response after it is received.
     *
     * @param response - The Axios response.
     * @param isLogging - Whether logging is enabled.
     *
     * @returns The modified response.
     */
    private static _handleResponse;
    /**
     * Clean the response log by removing sensitive information.
     *
     * @param response - The Axios response.
     *
     * @returns The sanitized response.
     */
    private static cleanResponseLog;
    /**
     * Sanitize an object by obfuscating sensitive fields.
     * This function is recursive and supports circular references using WeakMap.
     *
     * @param obj - The object to sanitize.
     * @param fieldsToObfuscate - List of keys whose values should be replaced with '***'. Defaults to ["authorization", "x-api-key", "password", "token"].
     * @param seen - Internal map to track processed objects and prevent infinite loops. Defaults to new WeakMap().
     *
     * @returns A new sanitized object with sensitive data obfuscated or removed.
     */
    private static sanitizeObject;
}