export declare const windows: Set<unknown>;
export declare function contentSize(el: HTMLElement): {
    width: number;
    height: number;
};
export declare class WindowResizeEvent {
    readonly width: number;
    readonly height: number;
    constructor(width: number, height: number);
}
export declare function leftTop(proxy: any): {
    left: number;
    top: number;
} | null;
export declare function distance2(x1: number, y1: number, x2: number, y2: number): number;
export declare function fixPosition(): void;
export declare const instances: any[];