Type Alias MenuItemActionMode

Marks this item as a submenu parent: adds the trailing chevron and aria-haspopup="menu". Nest the flyout as a <Menu> child.

Turn the row into a checkable item, driven by selected (the row stays the control and carries aria-checked):

• 'checkbox' → role="menuitemcheckbox", a leading passive <a-checkbox> (before icon); the tint is dropped (the box carries state).
• 'radio' → role="menuitemradio", a leading passive <a-radio>; tint dropped.
• 'check' → role="menuitemradio", a trailing check glyph on the selected row and the background tint (the canonical single-select look).
• 'switch' → role="menuitemcheckbox", a trailing passive <a-switch>; selecting the row keeps its menu open. Omit for a plain row (the default).

Only meaningful with selectionIndicator="checkbox": render the box in the mixed state (aria-checked="mixed") — e.g. a "Select all" row when some but not all of its options are selected.

Replace the built-in selection-indicator visual with your own node, rendered at the leading edge (where the checkbox / radio sit). Pair with selectionIndicator to keep the semantics — the row stays the control and carries role + aria-checked; only the drawn mark changes. Suppresses the built-in checkbox / radio and the trailing check glyph. The node is made passive (aria-hidden, no pointer events) so the row receives the click.