/**
 * The `HttpClient` class provides a robust, extensible API for making HTTP requests in TypeScript/JavaScript applications.
 *
 * It supports advanced features such as authentication, custom headers, request/response transformation, error handling,
 * timeouts, and built-in support for RESTful methods (GET, POST, PUT, PATCH, DELETE). The class is designed for easy extension,
 * allowing you to override methods for custom authentication, request options, or error handling.
 *
 * ## Key Features
 * - Automatic Bearer token support (override `getBeearToken` for dynamic tokens)
 * - Customizable request headers and options
 * - Built-in support for JSON and RESTful APIs
 * - Timeout and delay management for requests
 * - Comprehensive error handling and transformation
 * - Type-safe response transformation
 * - Extensible for custom authentication, logging, or request/response hooks
 *
 * ## Example Usage
 * ```typescript
 * const client = new HttpClient();
 * // GET request
 * const users = await client.fetchJSon<User[]>("/users");
 * // POST request
 * const result = await client.post<{ id: number }>("/users", { body: JSON.stringify({ name: "John" }) });
 * // Custom authentication
 * class MyClient extends HttpClient {
 *   async getBeearToken() { return await getTokenFromStorage(); }
 * }
 * ```
 *
 * @see IHttpClient.FetchOptions for request options
 * @see https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API
 * @see https://restfulapi.net/http-status-codes/
 */
export declare class HttpClient {
    /**
     * Gets the base URL for all HTTP requests.
     *
     * This method reads the `HTTP_CLIENT_BASE_URL` environment variable, sanitizes it,
     * and removes any trailing backslashes for consistency.
     *
     * @returns {string} The sanitized base URL string.
     *
     * @example
     * ```typescript
     * const client = new HttpClient();
     * const baseUrl = client.getBaseUrl();
     * // baseUrl might be "https://api.example.com"
     * ```
     */
    getBaseUrl(): string;
    /**
     * Retrieves a Bearer token for authentication.
     *
     * Override this method to provide dynamic authentication tokens for requests.
     *
     * @returns {string | Promise<string>} The Bearer token string or a promise resolving to it.
     *
     * @example
     * ```typescript
     * // Override in a subclass
     * class MyClient extends HttpClient {
     *   async getBeearToken() {
     *     return await getTokenFromStorage();
     *   }
     * }
     * ```
     */
    /**
     * Retrieves a Bearer token for authentication.
     *
     * Override this method to provide dynamic authentication tokens for requests.
     *
     * @returns {string | Promise<string>} The Bearer token string or a promise resolving to it.
     *
     * @example
     * ```typescript
     * // Override in a subclass
     * class MyClient extends HttpClient {
     *   async getBearerToken() {
     *     return await getTokenFromStorage();
     *   }
     * }
     * ```
     */
    getBearerToken(): string | Promise<string>;
    /**
     * Converts various header formats into a standardized `Headers` instance.
     *
     * @param headers - The headers to transform. Accepts an object, `Headers` instance, or undefined.
     * @returns {Headers} A standardized `Headers` instance.
     *
     * @example
     * ```typescript
     * const client = new HttpClient();
     * const headers = client.transformRequestHeader({ Authorization: "Bearer token" });
     * // headers instanceof Headers === true
     * ```
     */
    transformRequestHeader(headers?: any): Headers;
    /**
     * Prepares and transforms fetch options before sending an HTTP request.
     *
     * This method is useful for customizing headers, authentication, or other options before each request.
     *
     * @param options - The original fetch options object.
     * @param path - The endpoint path being requested.
     * @returns {IHttpClient.FetchOptions | Promise<IHttpClient.FetchOptions>} The transformed options.
     *
     * @example
     * ```typescript
     * const client = new HttpClient();
     * const opts = await client.transformRequestOptions({ headers: { Accept: "application/json" } }, "/users");
     * ```
     */
    transformRequestOptions(options: IHttpClient.FetchOptions, path: string): IHttpClient.FetchOptions | Promise<IHttpClient.FetchOptions>;
    /**
     * Performs an authenticated HTTP fetch request with enhanced headers and optional filtering.
     *
     * Automatically attaches an authorization token, sets default headers, and supports advanced filtering.
     *
     * @param path - The endpoint path to request (e.g., "/users").
     * @param options - Optional fetch options (headers, query params, body, delay, etc.).
     * @returns {Promise<Response>} Resolves to the fetch Response object.
     *
     * @example
     * ```typescript
     * const client = new HttpClient();
     * const response = await client.fetch("/users", { headers: { "X-Custom": "value" } });
     * ```
     */
    fetch(path: string, options?: IHttpClient.FetchOptions | null): Promise<Response>;
    /**
     * Sends an HTTP request and parses the response body as JSON.
     *
     * @typeParam T - The expected type of the parsed JSON response.
     * @param path - The URL or endpoint to request.
     * @param options - Optional fetch options.
     * @returns {Promise<T>} Resolves to the parsed JSON response.
     *
     * @example
     * ```typescript
     * const client = new HttpClient();
     * const data = await client.fetchJSon<{ users: User[] }>("/users");
     * ```
     */
    /**
     * Sends an HTTP request and parses the response body as JSON.
     *
     * @typeParam T - The expected type of the parsed JSON response.
     * @param path - The URL or endpoint to request.
     * @param options - Optional fetch options.
     * @returns {Promise<T>} Resolves to the parsed JSON response.
     *
     * @example
     * ```typescript
     * const client = new HttpClient();
     * const data = await client.fetchJson<{ users: User[] }>("/users");
     * ```
     */
    fetchJson<T = Response>(path: string, options?: IHttpClient.FetchOptions): Promise<T>;
    /**
     * Handles errors that occur during a fetch operation and throws a standardized error object.
     *
     * If error handling is disabled via options, the original error is re-thrown.
     *
     * @param error - The error object thrown by the fetch operation.
     * @param path - The endpoint path associated with the error.
     * @param options - Fetch options, which may include an error handling flag.
     * @throws An object containing a formatted error message, the request path, and the original error.
     *
     * @example
     * ```typescript
     * try {
     *   await client.fetch("/bad-endpoint");
     * } catch (err) {
     *   console.error(err.message, err.path);
     * }
     * ```
     */
    handleFetchError(error: any, path: string, options: IHttpClient.FetchOptions): Promise<void>;
    /**
     * Builds a complete URL by combining the provided endpoint with the base API host and query parameters.
     *
     * Throws an error if the API host is not set or invalid.
     *
     * @param url - The endpoint or base URL to build upon.
     * @param queryParams - Optional query parameters to append.
     * @returns {string} The fully constructed URL.
     * @throws Error if the API host environment variable is not set or invalid.
     *
     * @example
     * ```typescript
     * const client = new HttpClient();
     * const fullUrl = client.buildUrl("/users", { page: 2 });
     * // fullUrl might be "https://api.example.com/users?page=2"
     * ```
     */
    buildUrl(url: string, queryParams?: Record<string, any>): string;
    /**
     * Checks if the provided HTTP status code is considered a successful response.
     *
     * @param status - The HTTP status code (string or number).
     * @returns {boolean} True if the status code is successful, false otherwise.
     *
     * @example
     * ```typescript
     * client.isSuccessStatus(200); // true
     * client.isSuccessStatus("404"); // false
     * ```
     */
    isSuccessStatus(status: string | number): boolean;
    /**
     * Gets the default delay (in milliseconds) for fetch operations.
     *
     * @returns {number} The default fetch delay (120000 ms = 2 minutes).
     *
     * @example
     * ```typescript
     * const delay = client.getFetchDelay(); // 120000
     * ```
     */
    getFetchDelay(): number;
    /**
     * Wraps a promise with a timeout, rejecting if the promise does not resolve within the specified delay.
     *
     * @typeParam T - The type of the resolved value.
     * @param promise - The promise to wrap.
     * @param delay - Optional timeout in milliseconds. Uses default if not provided or too short.
     * @returns {Promise<T>} Resolves or rejects with the original promise, or rejects with a timeout error.
     *
     * @example
     * ```typescript
     * await client.timeout(fetch("/slow"), 5000);
     * ```
     */
    timeout<T = Response>(promise: Promise<T>, delay?: number): Promise<T>;
    /**
     * Transforms the HTTP response based on its content type.
     *
     * If the response is JSON, parses and returns it as type `T`. Otherwise, returns the raw response.
     *
     * @typeParam T - The expected return type.
     * @param response - The HTTP response to transform.
     * @param options - Additional fetch options (for extensibility).
     * @returns {Promise<T>} Resolves to the transformed response.
     *
     * @example
     * ```typescript
     * const res = await client.fetch("/data");
     * const json = await client.transformResponse(res, {});
     * ```
     */
    transformResponse<T = Response>(response: Response, options: IHttpClient.FetchOptions): Promise<T>;
    /**
     * Sends an HTTP POST request to the specified URL.
     *
     * @typeParam T - The expected response type after transformation.
     * @param url - The endpoint URL for the POST request.
     * @param options - Optional fetch options.
     * @returns {Promise<T>} Resolves to the transformed response.
     *
     * @example
     * ```typescript
     * const client = new HttpClient();
     * const result = await client.post<{ id: number }>("/users", { body: JSON.stringify({ name: "John" }) });
     * ```
     */
    post<T>(url: string, options?: IHttpClient.FetchOptions): Promise<T>;
    /**
     * Sends an HTTP PATCH request to the specified URL.
     *
     * @typeParam T - The expected response type after transformation.
     * @param url - The endpoint URL for the PATCH request.
     * @param options - Optional fetch options.
     * @returns {Promise<T>} Resolves to the transformed response.
     *
     * @example
     * ```typescript
     * const client = new HttpClient();
     * const result = await client.patch("/users/1", { body: JSON.stringify({ name: "Jane" }) });
     * ```
     */
    patch<T>(url: string, options?: IHttpClient.FetchOptions): Promise<T>;
    /**
     * Sends an HTTP PUT request to the specified URL.
     *
     * @typeParam T - The expected response type after transformation.
     * @param url - The endpoint URL for the PUT request.
     * @param options - Optional fetch options.
     * @returns {Promise<T>} Resolves to the transformed response.
     *
     * @example
     * ```typescript
     * const client = new HttpClient();
     * const result = await client.put("/users/1", { body: JSON.stringify({ name: "Jane" }) });
     * ```
     */
    put<T>(url: string, options?: IHttpClient.FetchOptions): Promise<T>;
    /**
     * Sends an HTTP DELETE request to the specified URL.
     *
     * @typeParam T - The expected response type.
     * @param url - The endpoint URL for the DELETE request.
     * @param options - Optional fetch options.
     * @returns {Promise<T>} Resolves to the transformed response.
     *
     * @example
     * ```typescript
     * const client = new HttpClient();
     * const result = await client.delete("/users/1");
     * ```
     */
    delete<T>(url: string, options?: IHttpClient.FetchOptions): Promise<T>;
    /**
     * Collection of standard HTTP status codes used to indicate the result of an HTTP request.
     *
     * This object provides named constants for commonly used HTTP status codes, including success, client error, and server error responses.
     *
     * @example
     * ```typescript
     * if (response.status === HttpClient.STATUSES.SUCCESS) {
     *   // Handle successful response
     * }
     * ```
     *
     * @see https://www.restapitutorial.com/httpstatuscodes.html
     * @see https://developer.mozilla.org/fr/docs/Web/HTTP/Status#r%C3%A9ponses_derreur_c%C3%B4t%C3%A9_client
     * @see https://restfulapi.net/http-status-codes/
     *
     * @property SUCCESS - 200: Indicates that the request has succeeded.
     * @property CREATED - 201: Indicates that the request has succeeded and a new resource has been created as a result.
     * @property ACCEPTED - 202: Indicates that the request has been received but not completed yet, typically used in long-running requests and batch processing.
     * @property NON_AUTHORITATIVE_INFORMATION - 203: Indicates that the returned metainformation is not definitive and may be from a local or third-party copy.
     * @property NO_CONTENT - 204: The server has fulfilled the request but does not need to return a response body.
     * @property RESET_CONTENT - 205: Indicates the client should reset the document which sent this request.
     * @property PARTIAL_CONTENT - 206: Used when the Range header is sent from the client to request only part of a resource.
     * @property MULTI_STATUS - 207: Indicates multiple operations happened; status for each can be found in the response body.
     * @property ALREADY_REPORTED - 208: Indicates the same resource was mentioned earlier; appears only in response bodies.
     * @property IM_USED - 226: The response is a representation of the result of one or more instance-manipulations applied to the current instance.
     * @property INTERNAL_SERVER_ERROR - 500: Indicates an internal server error.
     * @property SERVICE_UNAVAILABLE - 503: Indicates the service is unavailable.
     * @property BAD_REQUEST - 400: The server could not understand the request due to invalid syntax.
     * @property UNAUTHORIZED - 401: The client must authenticate itself to get the requested response.
     * @property PAYMENT_REQUIRED - 402: Reserved for future use; not currently used.
     * @property FORBIDEN - 403: The client does not have access rights to the content.
     * @property NOT_FOUND - 404: The server cannot find the requested resource.
     * @property METHOD_NOT_ALLOWED - 405: The request method is known but not supported by the target resource.
     * @property NOT_ACCEPTABLE - 406: The server cannot produce a response matching the list of acceptable values defined in the request's headers.
     */
    static STATUSES: {
        /***
                Indicates that the request has succeeded.
            */
        SUCCESS: number;
        /***
                Indicates that the request has succeeded and a new resource has been created as a result.
            */
        CREATED: number;
        /***
                Indicates that the request has been received but not completed yet. It is typically used in log running requests and batch processing.
            */
        ACCEPTED: number;
        /***
                Indicates that the returned metainformation in the entity-header is not the definitive set as available from the origin server, but is gathered from a local or a third-party copy. The set presented MAY be a subset or superset of the original version.
            */
        NON_AUTHORITATIVE_INFORMATION: number;
        /**
         * The server has fulfilled the request but does not need to return a response body. The server may return the updated meta information.
         */
        NO_CONTENT: number;
        /***
                Indicates the client to reset the document which sent this request.
            */
        RESET_CONTENT: number;
        /***
                It is used when the Range header is sent from the client to request only part of a resource.
            */
        PARTIAL_CONTENT: number;
        /***
                An indicator to a client that multiple operations happened, and that the status for each operation can be found in the body of the response.
            */
        MULTI_STATUS: number;
        /***
                Allows a client to tell the server that the same resource (with the same binding) was mentioned earlier. It never appears as a true HTTP response code in the status line, and only appears in bodies.
            */
        ALREADY_REPORTED: number;
        /**
         * The server has fulfilled a GET request for the resource, and the response is a representation of the result of one or more instance-manipulations applied to the current instance.
         */
        IM_USED: number;
        /***
         * status internal server error
         */
        INTERNAL_SERVER_ERROR: number;
        /***
         * status service unavailable
         */
        SERVICE_UNAVAILABLE: number;
        BAD_REQUEST: number;
        UNAUTHORIZED: number;
        PAYMENT_REQUIRED: number;
        FORBIDEN: number;
        NOT_FOUND: number;
        METHOD_NOT_ALLOWED: number;
        NOT_ACCEPTABLE: number;
    };
    /**
     * List of HTTP status codes considered as successful responses.
     *
     * Includes standard success codes such as 200 (OK), 201 (Created), 202 (Accepted), and more.
     * Used to determine if a response should be treated as a success.
     *
     * @example
     * ```typescript
     * if (HttpClient.SUCCESS_STATUSES.includes(response.status)) {
     *   // Success!
     * }
     * ```
     */
    static SUCCESS_STATUSES: number[];
}
export declare namespace IHttpClient {
    /**
     * Options for configuring HTTP requests made by `HttpClient`.
     *
     * Extends the standard `RequestInit` options from the Fetch API, adding support for delays, error handling,
     * query parameters, advanced filtering, and custom behaviors.
     *
     * @property delay - Optional timeout in milliseconds before the request is considered failed.
     * @property handleErrors - If false, disables automatic error transformation and throws raw errors.
     * @property queryParams - Object containing query parameters to append to the request URL.
     * @property xFilter - Advanced filter object, serialized as JSON for the `X-filter` header.
     * @property redirectToSigninPageOn401Response - If true, automatically redirects to sign-in page on 401 responses.
     * @property body - The request body (string, object, or FormData).
     *
     * @example
     * ```typescript
     * const options: IHttpClient.FetchOptions = {
     *   method: "POST",
     *   body: JSON.stringify({ name: "John" }),
     *   queryParams: { page: 2 },
     *   delay: 5000,
     *   handleErrors: true,
     * };
     * ```
     */
    interface FetchOptions extends RequestInit {
        delay?: number;
        handleErrors?: boolean;
        queryParams?: Record<string, any>;
        xFilter?: any;
        redirectToSignInOn401?: boolean;
        body?: any;
    }
}