import { type ViteUserConfig } from 'vitest/config';
import type { Config as StencilConfig } from '@stencil/core';
/**
 * Define a Vitest configuration for Stencil component testing
 *
 * Accepts standard Vitest config with optional Stencil enhancements.
 * Automatically applies Stencil-specific defaults:
 * - JSX configuration (h, Fragment)
 * - Resolve aliases from Stencil config (@, @components, @utils)
 * - Coverage configuration based on srcDir
 * - Exclude patterns for build outputs
 * - Auto-injects jsdom-setup for environment: 'jsdom'
 * - Auto-injects happy-dom-setup for environment: 'happy-dom'
 * - Custom 'stencil' environment handles its own setup
 *
 * @example
 * ```ts
 * import { defineVitestConfig } from '@stencil/vitest/config';
 *
 * export default defineVitestConfig({
 *   test: {
 *     projects: [
 *       {
 *         test: {
 *           name: 'stencil',
 *           include: ['**\/*.spec.tsx'],
 *           environment: 'stencil',
 *           setupFiles: ['./vitest-setup.ts'],
 *          // environmentOptions: {
 *          //   stencil: {
 *          //     domEnvironment: 'happy-dom' // 'jsdom' | 'mock-doc' (default), Make sure to install relevant packages
 *          //   },
 *          // },
 *         },
 *       },
 *       {
 *         test: {
 *           name: 'jsdom',
 *           include: ['**\/*.jsdom.spec.tsx'],
 *           environment: 'jsdom',
 *           setupFiles: ['./vitest-setup.ts'],
 *         },
 *       },
 *       {
 *         test: {
 *           name: 'happy-dom',
 *           include: ['**\/*.happy.spec.tsx'],
 *           environment: 'happy-dom',
 *           setupFiles: ['./vitest-setup.ts'],
 *         },
 *       },
 *       {
 *         test: {
 *           name: 'browser',
 *           include: ['**\/*.e2e.tsx'],
 *           browser: {
 *             enabled: true,
 *             provider: 'playwright',
 *             instances: [
 *               { browser: 'chromium' }
 *             ],
 *           },
 *         },
 *       },
 *     ],
 *   },
 * });
 * ```
 */
export declare function defineVitestConfig(config?: ViteUserConfig & {
    stencilConfig?: string | StencilConfig;
}): Promise<ViteUserConfig>;
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