import { Injector } from '@angular/core';
import { ActivatedRouteSnapshot, RouterStateSnapshot } from '@angular/router';
import { Platform } from '@ng-frrri/router-middleware/internal';
import { Observable } from 'rxjs';
import { Middleware } from '../interfaces/middleware.interface';
export declare abstract class MiddlewareAbstract<T = any> implements Middleware<T> {
    protected injector: Injector;
    supportedPlatforms: Platform[];
    statesRegistry: import("../public_api").StatesRegistry<any>;
    constructor(injector: Injector);
    abstract operate(operation: any, platform: Platform, route: ActivatedRouteSnapshot, state: RouterStateSnapshot): Observable<T> | Promise<T> | T;
}