import type { ReactiveController, ReactiveControllerHost } from 'lit';
/**
 * Reactive controller that tracks whether one or more slots have content, and
 * requests a host update whenever that changes. Lets a template react to empty
 * slots — e.g. collapse a footer row when nothing is slotted into it.
 *
 * Drives this off `slotchange` rather than a CSS selector because
 * `:host(:has(> [slot='name']))` is invalid (`:has()` can't be nested inside
 * `:host()`, so browsers drop the whole rule). Pair it with a data-attribute:
 *
 * ```ts
 * private _slots = new HasSlotController(this, 'footer');
 *
 * render() {
 *   return html`
 *     <footer part="footer" ?data-empty=${!this._slots.test('footer')}>
 *       <slot name="footer"></slot>
 *     </footer>
 *   `;
 * }
 * ```
 *
 * Pass `'[default]'` to test the default (unnamed) slot.
 */
export declare class HasSlotController implements ReactiveController {
    private host;
    private slotNames;
    constructor(host: ReactiveControllerHost & Element, ...slotNames: string[]);
    /** Whether the given slot currently has content. Use `'[default]'` for the default slot. */
    test(slotName: string): boolean;
    private hasNamedSlot;
    private hasDefaultSlot;
    private handleSlotChange;
    hostConnected(): void;
    hostDisconnected(): void;
}
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