export declare const runtimeIframeScriptSystem: {
    add: ((item: HTMLIFrameElement, initData?: {
        script: string;
    } | undefined) => false | import("@lincode/promiselikes").Cancellable) | ((item: HTMLIFrameElement, initData?: {
        script: string;
    } | undefined) => boolean);
    delete: ((item: HTMLIFrameElement) => false | import("@lincode/promiselikes").Cancellable | undefined) | ((item: HTMLIFrameElement) => boolean);
};