/**
* Both `<lr-tree>` and `<lr-tree-item>` override `getUpdateComplete()` to
* additionally await their currently-known, owner-bounded child `<lr-tree-item>`
* elements' own `updateComplete`. A nested node only receives private owner
* context (and the `tabIndex` derived from it) once its own render has committed -- one more
* pending update per accepted depth level -- so
* without this, code that awaits a parent's `updateComplete` (e.g.
* `focusNode()`) could run before a reachable descendant has
* actually settled.
*/
export declare function cascadeUpdateComplete(children:Iterable<{updateComplete:Promise<unknown>;}>):Promise<void>;