/**
 * @license
 * Copyright 2025 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */
import { CommentBarButton } from '../comments/comment_bar_button.js';
import type { IFocusableNode } from '../interfaces/i_focusable_node.js';
import type { INavigationPolicy } from '../interfaces/i_navigation_policy.js';
/**
 * Set of rules controlling keyboard navigation from a CommentBarButton.
 */
export declare class CommentBarButtonNavigationPolicy implements INavigationPolicy<CommentBarButton> {
    /**
     * Returns the first child of the given CommentBarButton.
     *
     * @param _current The CommentBarButton to return the first child of.
     * @returns Null.
     */
    getFirstChild(_current: CommentBarButton): IFocusableNode | null;
    /**
     * Returns the parent of the given CommentBarButton.
     *
     * @param current The CommentBarButton to return the parent of.
     * @returns The parent comment of the given CommentBarButton.
     */
    getParent(current: CommentBarButton): IFocusableNode | null;
    /**
     * Returns the next peer node of the given CommentBarButton.
     *
     * @param current The CommentBarButton to find the following element of.
     * @returns The next CommentBarButton, if any.
     */
    getNextSibling(current: CommentBarButton): IFocusableNode | null;
    /**
     * Returns the previous peer node of the given CommentBarButton.
     *
     * @param current The CommentBarButton to find the preceding element of.
     * @returns The CommentBarButton's previous CommentBarButton, if any.
     */
    getPreviousSibling(current: CommentBarButton): IFocusableNode | null;
    /**
     * Returns whether or not the given CommentBarButton can be navigated to.
     *
     * @param current The instance to check for navigability.
     * @returns True if the given CommentBarButton can be focused.
     */
    isNavigable(current: CommentBarButton): boolean;
    /**
     * Returns whether the given object can be navigated from by this policy.
     *
     * @param current The object to check if this policy applies to.
     * @returns True if the object is an CommentBarButton.
     */
    isApplicable(current: any): current is CommentBarButton;
}
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