import { Placement } from "@floating-ui/dom";
export type Side = "top" | "right" | "bottom" | "left";
export type Align = "start" | "center" | "end";
export interface AnchorOptions {
    side?: Side;
    align?: Align;
    sideOffset?: number;
    alignOffset?: number;
    /** Element rendered as the popup arrow; positioned automatically. */
    arrowEl?: HTMLElement | null;
    /** Match the popup width to the anchor width (used by select/combobox). */
    matchWidth?: boolean;
}
export declare function toPlacement(side?: Side, align?: Align): Placement;
/**
 * Anchor a floating element to a reference element. Returns a cleanup
 * function that stops auto-updating. The floating element must be
 * `position: fixed` (the default applied here).
 */
export declare function anchor(reference: HTMLElement, floating: HTMLElement, options?: AnchorOptions): () => void;