import { MessagingClient } from '@nestjs.pro/common/dist/messaging/MessagingClient';
import { CanActivate, ExecutionContext } from '@nestjs/common';
export declare class PrincipalGuard implements CanActivate {
    private readonly messagingClient;
    constructor(messagingClient: MessagingClient);
    canActivate(context: ExecutionContext): Promise<boolean>;
}