declare class Sandbox {
    sandbox: HTMLIFrameElement;
    setting?: string;
    private readonly blankURL;
    constructor(uri?: string, setting?: string, type?: 'src' | 'source');
    get window(): Window;
    get document(): Document;
    get origin(): string | null;
    set src(src: string);
    setOnUnload(onunload: null | ((this: WindowEventHandlers, ev: Event) => unknown)): Promise<void>;
    setOnLoad(onload: (this: GlobalEventHandlers, ev: Event) => unknown): Promise<void>;
    setOnError(onerror: OnErrorEventHandler): Promise<void>;
    set(allow?: string | undefined): void;
    reset(allow?: string): this;
    open(): this;
    write(context?: string): this;
    close(): this;
    append(context: string | undefined): void;
    enter(container: HTMLElement): void;
    exit(): void;
}
export { Sandbox };