import { Evogram } from '../Client';
import { TelegramUpdate } from '../types';
/**
 * Represents the context for middleware functions.
 * Inherits properties from TelegramUpdate and adds the client and any other properties.
 */
export interface MiddlewareContext extends TelegramUpdate {
    client: Evogram;
    state: Record<string, any>;
}
/**
 * Type definition for middleware functions.
 * It takes a MiddlewareContext and a next function to call the next middleware in the stack.
 */
export type MiddlewareFunction = (ctx: MiddlewareContext, next: () => Promise<any>) => Promise<any>;
/**
 * Manages the registration and execution of middleware functions for the Evogram client.
 */
export declare class Middleware {
    constructor();
    static middlewares: MiddlewareFunction[];
    private middlewares;
    /**
     * Registers a middleware function to the stack.
     * @param middleware The middleware function to register.
     */
    use(middleware: MiddlewareFunction): void;
    /**
     * Executes all registered middleware functions in order.
     * @param context The context to pass to middleware (includes TelegramUpdate and client).
     * @returns The context if all middleware executed successfully, or null if not.
     */
    execute(context: MiddlewareContext): Promise<MiddlewareContext | null>;
}