export type CornerRadii = [number, number, number, number];
export interface BlobBox {
    x: number;
    y: number;
    w: number;
    h: number;
    r: CornerRadii;
}
/** Transform-free position of `el` relative to `ancestor` via the offsetParent
 *  chain — the blob mirrors motion separately, so its base box must ignore the
 *  transform currently applied to the wrapper. */
export declare function offsetTo(el: HTMLElement, ancestor: HTMLElement): {
    x: number;
    y: number;
};
export declare function measureRadius(el: Element, w: number, h: number): CornerRadii;
export declare function normalizeRadius(r: number | CornerRadii): CornerRadii;
/** Rounded-rect path with per-corner radii, CSS-style overlap clamping. */
export declare function roundedRectPath(x: number, y: number, w: number, h: number, radii: CornerRadii): string;