import { Slot } from '@revesuite/global/utils';
import type { Workspace } from '../workspace.js';
import type { BlockIndexer } from './base.js';
type PageId = string;
type BlockId = string;
type LinkedNode = {
    type: 'LinkedPage' | 'Subpage';
    pageId: PageId;
    blockId: BlockId;
};
export type IndexUpdatedEvent = {
    action: 'delete';
    pageId: PageId;
    blockId?: BlockId;
} | {
    action: 'add' | 'update';
    pageId: PageId;
    blockId: BlockId;
};
export declare class BacklinkIndexer {
    private _linkIndexMap;
    private _disposables;
    slots: {
        /**
         * Note: sys:children update will not trigger event
         */
        indexUpdated: Slot<IndexUpdatedEvent>;
    };
    constructor(blockIndexer: BlockIndexer);
    private _backlinkIndexMapCache;
    /**
     * Get the list of backlinks for a given page
     */
    getBacklink(targetPageId: PageId): LinkedNode[];
    /**
     * Returns all valid subpage nodes in the given page.
     *
     * Note: this method will ignore invalid subpage nodes.
     *
     * @example
     * ```ts
     * const subpages = workspace.indexer.backlink
     *   .getSubpageNodes(pageId)
     *   .map(node => node.pageId);
     * ```
     */
    getSubpageNodes(pageId: PageId): LinkedNode[];
    getParentPage(pageId: string): string | null;
    /**
     * Delete the specified subpage nodes from the workspace.
     */
    removeSubpageNode(workspace: Workspace, subpageId: PageId): void;
    private _onRefreshIndex;
    private _onPageRemoved;
    private _onBlockUpdated;
    private _indexDelta;
    private _removeIndex;
    dispose(): void;
}
export {};
//# sourceMappingURL=backlink.d.ts.map