import { HTTPError } from './http-errors.js';
/**
 * Type guard to check if a value is an HTTPError instance.
 *
 * Performs an `instanceof` check against the HTTPError base class, allowing safe
 * type narrowing for HTTP error handling without duck-typing or protocol checks.
 *
 * @param value - The value to check
 * @returns `true` if value is an HTTPError instance, `false` otherwise
 *
 * @example
 * ```ts
 * import { IsHTTPError } from '@pawells/http-common';
 *
 * try {
 *   throw new HTTPNotFoundError('User not found');
 * } catch (error) {
 *   if (IsHTTPError(error)) {
 *     console.log(`HTTP ${error.HTTPStatusCode}: ${error.message}`);
 *   }
 * }
 * ```
 */
export declare function IsHTTPError(value: unknown): value is HTTPError;
/**
 * Type guard to check if a value is an HTTPError with a 4xx (client error) status code.
 *
 * Returns true when value is an HTTPError AND its status code is in the 400–499 range.
 * Enables ergonomic branching on client-error categories without manual range checking.
 *
 * @param value - The value to check
 * @returns `true` if value is an HTTPError with a status code in 400–499, `false` otherwise
 *
 * @example
 * ```ts
 * import { IsClientError } from '@pawells/http-common';
 *
 * try {
 *   throwSomeError();
 * } catch (error) {
 *   if (IsClientError(error)) {
 *     console.log('Client error:', error.message);
 *     // Handle 400–499 errors (bad request, not found, etc.)
 *   }
 * }
 * ```
 */
export declare function IsClientError(value: unknown): value is HTTPError;
/**
 * Type guard to check if a value is an HTTPError with a 5xx (server error) status code.
 *
 * Returns true when value is an HTTPError AND its status code is in the 500–599 range.
 * Enables ergonomic branching on server-error categories without manual range checking.
 *
 * @param value - The value to check
 * @returns `true` if value is an HTTPError with a status code in 500–599, `false` otherwise
 *
 * @example
 * ```ts
 * import { IsServerError } from '@pawells/http-common';
 *
 * try {
 *   throwSomeError();
 * } catch (error) {
 *   if (IsServerError(error)) {
 *     console.log('Server error:', error.message);
 *     // Handle 500–599 errors (internal server error, bad gateway, etc.)
 *     // Log the full stack and alert the operations team
 *   }
 * }
 * ```
 */
export declare function IsServerError(value: unknown): value is HTTPError;
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