export interface AnchorRect {
    top: number;
    left: number;
    width: number;
    height: number;
    bottom: number;
    right: number;
}
export interface PopupSize {
    width: number;
    height: number;
}
export declare function computePopupPosition(anchor: AnchorRect, popup: PopupSize, viewport: {
    width: number;
    height: number;
}, options?: {
    opens?: 'left' | 'right' | 'center' | 'auto';
    drops?: 'down' | 'up' | 'auto';
    gap?: number;
}): {
    top: number;
    left: number;
    placementY: 'up' | 'down';
    placementX: 'left' | 'right' | 'center';
};