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kettanaitokettanaito
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02/01: add solution
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‎exercises/01.sunsetting-jsdom/01.problem.break-jsdom/tsconfig.node.json‎

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"noFallthroughCasesInSwitch": true,
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"noUncheckedSideEffectImports": true
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},
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"include": ["vite.config.ts"]
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"include": ["vite.config.ts", "vitest.config.ts"]
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}

‎exercises/01.sunsetting-jsdom/01.solution.break-jsdom/tsconfig.node.json‎

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"noFallthroughCasesInSwitch": true,
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"noUncheckedSideEffectImports": true
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},
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"include": ["vite.config.ts"]
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"include": ["vite.config.ts", "vitest.config.ts"]
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}

‎exercises/02.vitest-browser-mode/01.solution.installation-and-setup/README.mdx‎

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# Installation and setup
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0. Uninstall JSDOM.
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1. Install Vitest and the Vitest browser package.
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1. Create Vitest configuration (or extend it).

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

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{
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"name": "exercises_02.vitest-browser-mode_01.solution.installation-and-setup",
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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/01.solution.installation-and-setup/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/01.solution.installation-and-setup/public/vite.svg‎

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Loading

‎exercises/02.vitest-browser-mode/01.solution.installation-and-setup/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/01.solution.installation-and-setup/src/file-preview.test.tsx‎

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import { it, expect } from 'vitest'
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import { render, screen } from '@testing-library/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(screen.getByText('file.txt')).toBeTruthy()
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expect(screen.getByText('hello world')).toBeTruthy()
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})

‎exercises/02.vitest-browser-mode/01.solution.installation-and-setup/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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}

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