/**
 * Utilities for computing a collapsed Range at a given viewport coordinate,
 * used by the drag-and-drop logic in `RichInputController` to position the
 * caret and drag indicator at the drop point.
 *
 * Tries shadow-root-aware APIs first, then document-level APIs, and finally
 * a manual text-node binary search for maximum browser coverage (Safari
 * doesn't expose caret APIs for Shadow DOM).
 */
/**
 * Compute a collapsed Range at the character position closest to the given
 * viewport coordinates within `container`. Tries shadow-root-aware caret
 * APIs first, then document-level APIs, then a manual walk.
 *
 * @param shadowRoot - Shadow root to try shadow-aware caret APIs on.
 * @param container  - The contenteditable element to search within.
 * @param x          - Viewport X coordinate.
 * @param y          - Viewport Y coordinate.
 * @param ignoreNode - Optional node to skip during the manual walk (e.g. drag caret).
 */
export declare function getRangeAtPoint(shadowRoot: ShadowRoot | null, container: HTMLElement, x: number, y: number, ignoreNode?: Node | null): Range | null;