/******************************************************************************
 * Copyright 2023 TypeFox GmbH
 * This program and the accompanying materials are made available under the
 * terms of the MIT License, which is available in the project root.
 ******************************************************************************/
import type { DiagramState, SModelElement, SModelRoot } from 'sprotty-protocol';
import type { LangiumSprottyServices } from './sprotty-services.js';
import { RequestPopupModelAction } from 'sprotty-protocol';
/**
 * Adds a handler for RequestPopupModelAction requests and configures a default response for diagnostic markers.
 * A custom popup model can be created by providing a function as second parameter.
 */
export declare function addHoverPopupHandler(services: LangiumSprottyServices, customPopupModel?: (element: SModelElement, request: RequestPopupModelAction, state: DiagramState) => SModelRoot | undefined): void;
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