export interface SignerOptions {
    pathname: string;
    method: 'GET' | 'POST' | 'PUT' | 'DELETE' | 'PATCH';
    body?: string;
    region?: 'cn-beijing' | 'cn-shanghai' | string;
    params?: Record<string, any>;
}
/**
 * 火山引擎API签名工具
 * @param options 签名参数
 * @param accessKeyId 用户AK
 * @param secretKey 用户SK
 * @returns 签名后的请求头
 */
export declare function signRequest(options: SignerOptions, accessKeyId?: string, secretKey?: string): Record<string, string>;