import { type ModelOptions, RootModel } from './Model/Model';
import Backend = require('sharedb');
export type BackendOptions = {
    modelOptions?: ModelOptions;
} & Backend.ShareDBOptions;
/**
 * RacerBackend extends ShareDb Backend
 */
export declare class RacerBackend extends Backend {
    racer: any;
    modelOptions: ModelOptions;
    /**
     *
     * @param racer - Racer instance
     * @param options - Model and SharedB options
     */
    constructor(racer: any, options?: BackendOptions);
    /**
     * Create new `RootModel`
     *
     * @param options - Optional model options
     * @param request - Optional request context See {@link Backend.listen} for details.
     * @returns a new root model
     */
    createModel(options?: ModelOptions, request?: any): RootModel;
    /**
     * Model middleware that creates and attaches a {@link Model} to the `request`
     * and attaches listeners to response for closing model on response completion
     *
     * @returns an Express middleware function
     */
    modelMiddleware(): (req: any, res: any, next: any) => any;
}