/**
 * splice xml helper
 * @example
 *
 * new Wrapper("inner content").wrap('ctrl', { id: 20, name: "sora"})
 *
 * // => `<ctrl id="20" name="sora">inner content</ctrl>`
 */
export declare class Wrapper {
    private _xml;
    constructor(xml?: string | number);
    wrap(xml: string | number, attrs?: {}): this;
    append(xml: string | number, attrs?: {}, content?: string): this;
    value(): string;
    valueOf(): string;
    toString(): string;
}