export declare const updateDTSystem: {
    add: ((item: {
        update: (dt: number) => void;
    }, initData?: void | Record<string, any> | undefined) => false | import("@lincode/promiselikes").Cancellable) | ((item: {
        update: (dt: number) => void;
    }, initData?: void | Record<string, any> | undefined) => boolean);
    delete: ((item: {
        update: (dt: number) => void;
    }) => false | import("@lincode/promiselikes").Cancellable | undefined) | ((item: {
        update: (dt: number) => void;
    }) => boolean);
};