import { CanActivate, ExecutionContext } from "@nestjs/common";
import { Reflector } from "@nestjs/core";
import { PermissionService } from "../services/permission.service";
/**
 * Guard that enforces permission-based authorization.
 *
 * This guard:
 * 1. Checks for an authenticated principal (throws 401 if missing)
 * 2. Checks required permissions based on metadata from decorators:
 *    - `@RequiresPermission()` - requires ALL permissions (AND logic)
 *    - `@RequiresAnyPermission()` - requires ANY permission (OR logic)
 *
 * @throws {UnauthorizedException} If no authenticated principal exists
 * @throws {PermissionDeniedException} If the principal lacks required permissions
 */
export declare class RequiresPermissionGuard implements CanActivate {
    private readonly reflector;
    private readonly permissionService;
    constructor(reflector: Reflector, permissionService: PermissionService);
    /**
     * Validates authentication and authorization for the current request.
     *
     * @param context - Execution context providing access to the request
     * @returns true if authorized
     * @throws {UnauthorizedException} If not authenticated
     * @throws {PermissionDeniedException} If permission check fails
     */
    canActivate(context: ExecutionContext): boolean;
}