/**
* Resolve the effective writing direction for the viewer.
*
* Explicit `ltr`/`rtl` always wins. `auto` (or `undefined`) walks up
* from the container looking for a `dir` attribute and, failing that,
* reads the computed direction of the host document's root element.
*/
export declare function resolveDirection(explicit: "ltr" | "rtl" | "auto" | undefined, container: HTMLElement): "ltr" | "rtl";