import { TencentYunZone } from '../../types/TencentYun';
export declare class TencentYunInstance {
    private accessKey;
    private secretKey;
    private COS;
    constructor(accessKey: string, secretKey: string);
    getUploadInfo(bucket: string, zone: TencentYunZone, key?: string): {
        key: string | undefined;
        accessKey: string;
        policy: string;
        signature: string;
        uploadHost: string;
        bucket: string;
        keyTime: string;
        algorithm: string;
    };
    private getSignInfo;
    removeFile(srcBucket: string, zone: TencentYunZone, srcKey: string): Promise<any>;
    isExistObject(srcBucket: string, zone: TencentYunZone, srcKey: string): Promise<boolean>;
    /**
     * 获取预签名对象URL（统一接口）
     * 生成腾讯云对象的预签名访问URL
     */
    presignObjectUrl(method: 'GET' | 'PUT' | 'POST' | 'DELETE', bucket: string, zone: TencentYunZone, key: string, options?: {
        expires?: number;
    }): Promise<{
        url: string;
        headers?: Record<string, string | string[]>;
        formdata?: Record<string, any>;
    }>;
}