import { CanActivate, ExecutionContext } from '@nestjs/common';
import { Reflector } from '@nestjs/core';
/**
 * Guard that enforces role-based access control. Works in conjunction
 * with the @RequireRoles() decorator to restrict access to routes based on
 * user roles stored in the session.
 *
 * @example
 * ```ts
 * @Controller('admin')
 * @UseGuards(RolesGuard)
 * export class AdminController {
 *   @Get('users')
 *   @RequireRoles('admin', 'moderator')
 *   getUsers() {
 *     // Only users with 'admin' or 'moderator' roles can access
 *   }
 * }
 * ```
 */
export declare class RolesGuard implements CanActivate {
    private readonly reflector;
    constructor(reflector: Reflector);
    /**
     * Determines if the current request should be allowed based on user roles.
     *
     * @param context - The execution context containing request and handler info
     * @returns true if access should be granted, false otherwise
     */
    canActivate(context: ExecutionContext): boolean;
}