import { TMiddleware } from './definitions';
/** A middleware manager */
export declare class MiddlewareManager<T> {
    /** The list of middlewares */
    private _middlewares;
    /** The list of middlewares that runs at last */
    private _lastMiddlewares;
    /** Returns how many middlewares there are */
    readonly length: number;
    /**
     * add a middleware to the middleware list
     * @param middleware the middleware
     */
    use(middleware: TMiddleware<T>): this;
    /**
     * add a middleware to another middleware list that'll be run at last
     * @param middleware the middleware
     */
    useLast(middleware: TMiddleware<T>): this;
    /**
     * Let context go through the middlewares
     * @param ctx the context
     */
    run(ctx: T): Promise<void>;
}