import { ListboxOption } from '@microsoft/fast-foundation';
/**
 * @tagname %%prefix%%-optgroup
 */
export declare class Optgroup extends ListboxOption {
    /**
     * We extend ListboxOption to ensure this component passes the default slottedOptionFilter
     * in FASTSelect, which checks for `instanceof ListboxOption` or `role="option"`.
     * This allows the group to be slotted into the listbox, where our custom Select logic
     * then handles flattening the children.
     *
     * We also set role="option" in the template because FASTSelect's internal logic and
     * event handlers query for elements with role="option". Without this, the group (and
     * its children) may be ignored or event delegation might fail.
     *
     * We disable it to prevent it from being selectable itself.
     */
    /**
     * The label for the group.
     * Named groupLabel to avoid name conflict with ListboxOption.label.
     * @public
     * @remarks
     * HTML Attribute: label
     */
    groupLabel: string;
    connectedCallback(): void;
}
/**
 * The Foundation Optgroup
 *
 * @public
 * @remarks
 * HTML Element: \<foundation-optgroup\>
 */
export declare const foundationOptgroup: (overrideDefinition?: import("@microsoft/fast-foundation").OverrideFoundationElementDefinition<import("@microsoft/fast-foundation").FoundationElementDefinition>) => import("@microsoft/fast-foundation").FoundationElementRegistry<import("@microsoft/fast-foundation").FoundationElementDefinition, typeof Optgroup>;
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