/**
* Leaf module shared by `<lr-menu>` and `<lr-menu-item>`.
*
* A submenu makes the two components mutually dependent — the menu drives its items' submenus,
* and an item drives the `<lr-menu>` assigned to its `submenu` slot. `menu.class.ts` already
* imports `menu-item.class.ts`, so the return edge (even as `import type`, which the import-cycle
* gate counts) would close a cycle. Everything both sides need therefore lives here instead.
*/
/**
* Where roving focus lands when a menu opens. `'none'` opens without moving DOM focus at all —
* what pointer-driven opening needs, so a submenu that appears under the cursor never yanks focus
* away from the keyboard's current position (and never strands it on a hidden element when the
* pointer moves on again).
*/
export type MenuFocusTarget='first'|'last'|'none';