/**
 * Copyright (c) Cisco Systems, Inc. and its affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 */
/** This mixin help to manage slottable nodes (light DOM children) that become the contents of `<slot>` element.
 *
 * @property({ type: Array, attribute: false }) slotted <--- when an element is inserted in a slot.
 *
 * Example:
 *
 * @customElements("custom-element")
 * class CustomElement extends SlottedMixin(LitElement) {
 *  @query('slot[name="custom"]') tabSlot?: HTMLSlotElement;
 *  get slotElement() { <--- You need to override this getter in parent component class to return specific slot (default or named) from your component’s render root.
      return this.tabSlot;
    }
    protected filterSlotted() { <--- You need to override this method in parent component class to return filtered elements from slotted. (See tab implementation for example)
      return Array.from(this.children) as HTMLElement[]; <--- By default this method return all children of custom component render root.
    }
    protected slottedChanged() { <--- You can override this method to handle when the node(s) contained in slotElement change.

    }
    render() {
      return html`
        <slot name="custom"></slot>
      `;
    }
 * }
 */
import { LitElement } from "lit";
export type AnyConstructor<A = LitElement> = new (...args: any[]) => A;
export interface SlotableInterface {
    slotted: HTMLElement[];
}
export declare abstract class SlotableClass extends LitElement {
    protected handleSlotted?(): void;
    protected slottedChanged?(): void;
    protected filterSlotted?(): HTMLElement[];
}
export declare const SlottedMixin: <T extends AnyConstructor<SlotableClass>>(base: T) => T & AnyConstructor<SlotableClass & SlotableInterface>;