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02/02: add solution
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‎exercises/02.vitest-browser-mode/01.solution.installation-and-setup/package.json

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},
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"devDependencies": {
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"@testing-library/dom": "^10.4.0",
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"@testing-library/react": "^16.1.0",
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"@types/react": "^19.0.6",
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"@types/react-dom": "^19.0.3",
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"@vitejs/plugin-react": "^4.3.4",
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"postcss": "^8.4.49",
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"tailwindcss": "^3.4.17",
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"vite": "^6.0.7",
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"vitest": "^3.0.0-beta.4"
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"vitest": "^3.0.0-beta.4",
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"vitest-browser-react": "^0.0.4"
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}
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}

‎exercises/02.vitest-browser-mode/02.problem.migrate-from-jsdom/README.mdx

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‎exercises/02.vitest-browser-mode/02.problem.migrate-from-jsdom/package.json

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‎exercises/02.vitest-browser-mode/02.solution.migrate-the-test/README.mdx

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# Migrate the test
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0. Remove `@testing-library/react`. It expects JSDOM, but we are in the browser. For easier rendering, Vitest has specific wrappers for frameworks, like React or Vute.
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1. Install `vitest-browser-react` to render React components in the browser.
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1. Use `render` from `vitest-browser-react` to render the component now.
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1. Use `page` from `@vitest/browser/context` to select elements on the page for interactions and assertions.

‎exercises/02.vitest-browser-mode/02.solution.migrate-the-test/index.html

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<!doctype html>
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<html lang="en">
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<head>
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<meta charset="UTF-8" />
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<link rel="icon" type="image/svg+xml" href="/vite.svg" />
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<meta name="viewport" content="width=device-width, initial-scale=1.0" />
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<title>Vite App</title>
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<link rel="preconnect" href="https://fonts.googleapis.com" />
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<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin />
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</head>
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<body>
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<div id="root"></div>
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<script type="module" src="/src/main.tsx"></script>
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</body>
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</html>

‎exercises/02.vitest-browser-mode/02.solution.migrate-the-test/package.json

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{
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"name": "exercises_02.vitest-browser-mode_02.solution.migrate-the-test",
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"scripts": {
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"dev": "vite",
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"test": "vitest"
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},
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"dependencies": {
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"react": "^19.0.0",
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"react-dom": "^19.0.0"
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},
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"devDependencies": {
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"@testing-library/dom": "^10.4.0",
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"@testing-library/react": "^16.1.0",
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"@types/react": "^19.0.6",
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"@types/react-dom": "^19.0.3",
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"@vitejs/plugin-react": "^4.3.4",
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"@vitest/browser": "^3.0.0-beta.4",
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"autoprefixer": "^10.4.20",
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"postcss": "^8.4.49",
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"tailwindcss": "^3.4.17",
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"vite": "^6.0.7",
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"vitest": "^3.0.0-beta.4"
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}
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}

‎exercises/02.vitest-browser-mode/02.solution.migrate-the-test/postcss.config.js

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module.exports = {
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plugins: {
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tailwindcss: {},
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autoprefixer: {},
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},
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}

‎exercises/02.vitest-browser-mode/02.solution.migrate-the-test/public/vite.svg

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‎exercises/02.vitest-browser-mode/02.solution.migrate-the-test/src/app.tsx

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import { useState } from 'react'
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import { FilePreview } from './file-preview.jsx'
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export function App() {
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const [file, setFile] = useState<File>()
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return (
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<div>
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{file ? (
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<div className="flex flex-col items-center">
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<FilePreview file={file} />
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<button
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className="mt-10 rounded-full bg-slate-800 px-6 py-2 text-sm font-bold text-white hover:bg-slate-600"
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onClick={() => setFile(undefined)}
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>
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Preview another file
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</button>
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</div>
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) : (
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<div className="rounded-md border border-slate-200 bg-white p-4 shadow-lg shadow-slate-200">
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<input
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type="file"
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name="file"
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required
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className="text-sm font-medium"
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onChange={(event) => {
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const [selectedFile] = event.currentTarget.files || []
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if (selectedFile) {
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setFile(selectedFile)
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}
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}}
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/>
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</div>
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)}
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</div>
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)
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}

‎exercises/02.vitest-browser-mode/02.solution.migrate-the-test/src/file-preview.test.tsx

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import { it, expect } from 'vitest'
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import { page } from '@vitest/browser/context'
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import { render } from 'vitest-browser-react'
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import { FilePreview } from './file-preview.tsx'
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it('displays the preview card', async () => {
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render(<FilePreview file={new File(['hello world'], 'file.txt')} />)
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expect(page.getByText('file.txt')).toBeTruthy()
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expect(page.getByText('hello world')).toBeTruthy()
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})

‎exercises/02.vitest-browser-mode/02.solution.migrate-the-test/src/file-preview.tsx

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import { useEffect, useState } from 'react'
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export function FilePreview({ file }: { file: File }) {
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const [previewText, setPreviewText] = useState<string>()
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useEffect(() => {
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file.text().then(setPreviewText)
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}, [file])
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return (
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<div>
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<div className="w-full max-w-2xl overflow-hidden rounded-md border border-slate-200 bg-white shadow-lg shadow-slate-200">
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<p className="border-b border-slate-200 bg-slate-50 px-4 py-2 font-bold text-slate-600">
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{file.name}
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</p>
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<pre className="max-h-[28ch] overflow-scroll p-4">{previewText}</pre>
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</div>
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</div>
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)
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}

‎exercises/02.vitest-browser-mode/02.solution.migrate-the-test/src/index.css

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@import url('https://fonts.googleapis.com/css2?family=DM+Sans:ital,opsz,wght@0,9..40,100..1000;1,9..40,100..1000&display=swap');
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@tailwind base;
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@tailwind components;
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@tailwind utilities;
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html {
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@apply flex size-full items-center justify-center bg-slate-100 p-10;
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font-family:
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'DM Sans',
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system-ui,
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-apple-system,
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BlinkMacSystemFont,
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'Segoe UI',
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Roboto,
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Oxygen,
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Ubuntu,
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Cantarell,
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'Open Sans',
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'Helvetica Neue',
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sans-serif;
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font-style: normal;
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font-optical-sizing: auto;
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}

‎exercises/02.vitest-browser-mode/02.solution.migrate-the-test/src/main.tsx

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import { StrictMode } from 'react'
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import { createRoot } from 'react-dom/client'
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import './index.css'
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import { App } from './app.jsx'
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createRoot(document.getElementById('root')!).render(
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<StrictMode>
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<App />
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</StrictMode>,
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)

‎exercises/02.vitest-browser-mode/02.solution.migrate-the-test/src/vite-env.d.ts

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/// <reference types="vite/client" />

‎exercises/02.vitest-browser-mode/02.solution.migrate-the-test/tailwind.config.ts

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import type { Config } from 'tailwindcss'
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export default {
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content: ['./index.html', './src/**/*.{ts,tsx}'],
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theme: {
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extend: {},
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},
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plugins: [],
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} satisfies Config

‎exercises/02.vitest-browser-mode/02.solution.migrate-the-test/tsconfig.app.json

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{
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"compilerOptions": {
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"target": "ES2020",
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"useDefineForClassFields": true,
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"lib": ["ES2020", "DOM", "DOM.Iterable"],
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"module": "ESNext",
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"skipLibCheck": true,
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/* Bundler mode */
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"moduleResolution": "bundler",
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"allowImportingTsExtensions": true,
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"isolatedModules": true,
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"moduleDetection": "force",
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"noEmit": true,
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"jsx": "react-jsx",
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"verbatimModuleSyntax": true,
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/* Linting */
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"strict": true,
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"noUnusedLocals": true,
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"noUnusedParameters": true,
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"noFallthroughCasesInSwitch": true,
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"noUncheckedSideEffectImports": true
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},
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"include": ["src"]
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}

‎exercises/02.vitest-browser-mode/02.solution.migrate-the-test/tsconfig.json

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{
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"files": [],
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"references": [
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{ "path": "./tsconfig.app.json" },
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{ "path": "./tsconfig.node.json" }
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]
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}

‎exercises/02.vitest-browser-mode/02.solution.migrate-the-test/tsconfig.node.json

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{
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"compilerOptions": {
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"target": "ES2022",
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"lib": ["ES2023"],
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"module": "ESNext",
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"skipLibCheck": true,
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/* Bundler mode */
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"moduleResolution": "bundler",
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"allowImportingTsExtensions": true,
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"isolatedModules": true,
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"moduleDetection": "force",
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"noEmit": true,
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/* Linting */
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"strict": true,
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"noUnusedLocals": true,
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"noUnusedParameters": true,
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"noFallthroughCasesInSwitch": true,
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"noUncheckedSideEffectImports": true
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},
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"include": ["vite.config.ts", "vitest.config.ts"]
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}

‎exercises/02.vitest-browser-mode/02.solution.migrate-the-test/vite.config.ts

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import { defineConfig } from 'vite'
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import react from '@vitejs/plugin-react'
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export default defineConfig({
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plugins: [react()],
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})

‎exercises/02.vitest-browser-mode/02.solution.migrate-the-test/vitest.config.ts

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import { defineConfig } from 'vitest/config'
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export default defineConfig({
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test: {
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browser: {
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enabled: true,
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instances: [
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{
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browser: 'chromium',
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},
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],
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},
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},
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})

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