import type { Plugin } from 'vitest/config';
/**
 * A Vite/Vitest plugin that transforms Stencil component source files (.tsx) on-the-fly,
 * enabling module mocking and direct source imports during tests.
 *
 * The compiled output uses `componentExport: 'customelement'`, which appends a
 * `customElements.define()` call at the end of the transformed file. The component
 * registers itself the moment the module is imported - no dist loader or setup file
 * required. Works with `@stencil/core` v4 and v5.
 *
 * @example
 * ```ts
 * // vitest.config.ts
 * import { defineVitestConfig } from '@stencil/vitest/config';
 * import { stencilVitestPlugin } from '@stencil/vitest/plugin';
 *
 * export default defineVitestConfig({
 *   plugins: [stencilVitestPlugin()],
 *   test: {
 *     projects: [
 *       {
 *         test: {
 *           name: 'stencil',
 *           environment: 'stencil',
 *           include: ['**\/*.spec.tsx'],
 *           // No dist loader needed - import components from source directly
 *         },
 *       },
 *     ],
 *   },
 * });
 * ```
 * @param opts Optional configuration for the plugin
 * @returns a Vite plugin configuration object
 */
export declare function stencilVitestPlugin(opts?: {
    css?: boolean;
}): Plugin;
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