/**
 * HeaderHandler
 *
 * Handles HTTP header assertions.
 * Supports exact match, existence check (*), and case-insensitive header names.
 */
import { HttpResponse } from '../../types';
import { IAssertionHandler, AssertionResult } from '../IAssertionHandler';
export declare class HeaderHandler implements IAssertionHandler {
    readonly type = "header";
    private static readonly KNOWN_HEADERS;
    canHandle(key: string): boolean;
    assert(key: string, value: string, response: HttpResponse): AssertionResult;
}