import type { Plugin } from 'vite';
/**
 * Vite plugin that adds Content Security Policy headers to all responses.
 * Ports packages/cli/src/dev/csp/setup-csp.ts to Vite's configureServer hook.
 *
 * Note: Vite's own HMR client (/@vite/client) is served on the same origin,
 * so 'self' in script-src covers it. The Vite HMR WebSocket reuses the server port,
 * so the existing localhost connect-src allowances cover it too.
 */
export declare function dtCspVitePlugin(): Plugin;