/** @internal */
export type Direction = 'ltr' | 'rtl';
/**
 * Array of supported units to specify the size of a panel.
 * @public
 */
export declare const panelSizeUnits: readonly ["px", "fr", "%", "vw", "rem"];
/**
 * The supported units to specify the size of a panel.
 * @public
 */
export type PanelSizeUnit = (typeof panelSizeUnits)[number];
/**
 * The size of a panel.
 * @public
 */
export type PanelSize = number | `${number}${PanelSizeUnit}`;