import type { Plugin } from 'vite';
/**
 * Holds the latest TypeScript error message from the worker thread.
 * Shared between the plugin (reads on every HTML response) and
 * the TypeScript worker callbacks in vite-dev-server.ts (writes).
 */
export interface TypeScriptErrorHolder {
    lastError: string | null;
}
/**
 * Generates a static HTML snippet for the TypeScript error overlay.
 * Injected directly into the HTML response so it is visible even after
 * Vite-triggered page reloads caused by failed HMR updates.
 */
export declare function generateErrorOverlayHtml(message: string): string;
/**
 * Vite plugin that injects a lightweight TypeScript error overlay into the dev server.
 * Works in tandem with the TypeScript worker callbacks wired up in vite-dev-server.ts.
 *
 * Two complementary mechanisms are used:
 * 1. **Server-side**: When the HTML is served and there is a stored TypeScript error,
 *    the error overlay HTML is injected directly into the response. This survives
 *    Vite-triggered page reloads caused by failed HMR updates.
 * 2. **Client-side (HMR)**: A virtual module listens for `dt:ts-error` / `dt:ts-errors-clear`
 *    custom HMR events and dynamically shows/hides the overlay without a page reload.
 */
export declare function dtErrorOverlayPlugin(errorHolder: TypeScriptErrorHolder): Plugin;