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michaelfaithljharb
michaelfaith
authored and
ljharb
committedJun 17, 2024··
[New] add support for Flat Config
This change adds support for ESLint's new Flat config system. It maintains backwards compatibility with eslintrc style configs as well. To achieve this, we're now dynamically creating four configs: two are the original `recommended` and `strict`, and the other two are the new `flat/recommended` and `flat/strict`. The two `flat` ones are setup with the new config format, while the original two have the same options as before. Usage Legacy ```json { "extends": ["plugin:jsx-a11y/recommended"] } ``` Flat ```js import globals from 'globals'; import js from '@eslint/js'; import jsxA11y from 'eslint-plugin-jsx-a11y'; export default [ js.configs.recommended, jsxA11y.flatConfigs.recommended, { files: ['**/*.{js,mjs,cjs,jsx,mjsx,ts,tsx,mtsx}'], languageOptions: { ecmaVersion: 'latest', sourceType: 'module', globals: globals.browser, }, ignores: ['dist', 'eslint.config.js'], rules: { 'no-unused-vars': 'warn', 'jsx-a11y/anchor-ambiguous-text': 'warn', 'jsx-a11y/anchor-is-valid': 'warn', }, }, ]; ```
·
v6.10.2v6.9.0
1 parent 51a1ca7 commit 6b5f096

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-293
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‎.eslintrc

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"ignorePatterns": [
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"lib/",
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"reports/",
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"examples/",
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],
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"parser": "@babel/eslint-parser",
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"plugins": [

‎.github/workflows/node-pretest.yml

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node-version: 'lts/*'
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skip-ls-check: true
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- run: npm run posttest
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examples:
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runs-on: ubuntu-latest
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steps:
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- uses: actions/checkout@v4
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- uses: ljharb/actions/node/install@main
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name: 'nvm install lts/* && npm install'
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with:
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node-version: 'lts/*'
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skip-ls-check: true
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- run: npm run test:examples

‎README.md

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@@ -60,7 +60,8 @@ yarn add eslint-plugin-jsx-a11y --dev
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**Note:** If you installed ESLint globally (using the `-g` flag in npm, or the `global` prefix in yarn) then you must also install `eslint-plugin-jsx-a11y` globally.
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## Usage
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<a id="usage"></a>
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## Usage - Legacy Config (`.eslintrc`)
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Add `jsx-a11y` to the plugins section of your `.eslintrc` configuration file. You can omit the `eslint-plugin-` prefix:
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}
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```
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## Usage - Flat Config (`eslint.config.js`)
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The default export of `eslint-plugin-jsx-a11y` is a plugin object.
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```js
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const jsxA11y = require('eslint-plugin-jsx-a11y');
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module.exports = [
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…
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{
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files: ['**/*.{js,mjs,cjs,jsx,mjsx,ts,tsx,mtsx}'],
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plugins: {
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'jsx-a11y': jsxA11y,
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},
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languageOptions: {
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parserOptions: {
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ecmaFeatures: {
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jsx: true,
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},
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},
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},
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rules: {
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// ... any rules you want
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'jsx-a11y/alt-text': 'error',
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},
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// ... others are omitted for brevity
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},
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…
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];
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```
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### Shareable Configs
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There are two shareable configs, provided by the plugin.
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- `flatConfigs.recommended`
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- `flatConfigs.strict`
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#### CJS
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```js
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const jsxA11y = require('eslint-plugin-jsx-a11y');
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export default [
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jsxA11y.flatConfigs.recommended,
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{
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// Your additional configs and overrides
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},
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];
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```
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#### ESM
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```js
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import jsxA11y from 'eslint-plugin-jsx-a11y';
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export default [
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jsxA11y.flatConfigs.recommended,
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{
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// Your additional configs and overrides
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},
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];
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```
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**Note**: Our shareable config do configure `files` or [`languageOptions.globals`](https://eslint.org/docs/latest/user-guide/configuring/configuration-files-new#configuration-objects).
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For most of the cases, you probably want to configure some of these properties yourself.
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```js
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const jsxA11yRecommended = require('eslint-plugin-jsx-a11y');
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const globals = require('globals');
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module.exports = [
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…
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{
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files: ['**/*.{js,mjs,cjs,jsx,mjsx,ts,tsx,mtsx}'],
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...jsxA11y.flatConfigs.recommended,
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languageOptions: {
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...jsxA11y.flatConfigs.recommended.languageOptions,
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globals: {
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...globals.serviceworker,
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...globals.browser,
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},
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},
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},
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…
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];
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```
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#### Component Mapping
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To enable your custom components to be checked as DOM elements, you can set global settings in your configuration file by mapping each custom component name to a DOM element type.
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will be evaluated as an `h3`. If no `polymorphicPropName` is set, then the component will be evaluated as `Box`.
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⚠️ Polymorphic components can make code harder to maintain; please use this feature with caution.
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⚠️ Polymorphic components can make code harder to maintain; please use this feature with caution.
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## Supported Rules
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‎examples/flat-cjs/eslint.config.cjs

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const globals = require('globals');
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const js = require('@eslint/js');
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const jsxA11y = require('eslint-plugin-jsx-a11y');
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module.exports = [
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js.configs.recommended,
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jsxA11y.flatConfigs.recommended,
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{
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files: ['**/*.{js,mjs,cjs,jsx,mjsx,ts,tsx,mtsx}'],
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languageOptions: {
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ecmaVersion: 'latest',
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sourceType: 'module',
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globals: globals.browser,
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},
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ignores: ['dist', 'eslint.config.cjs'],
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rules: {
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'no-unused-vars': 'off',
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'jsx-a11y/anchor-ambiguous-text': 'warn',
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'jsx-a11y/anchor-is-valid': 'warn',
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},
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},
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];

‎examples/flat-cjs/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 + React</title>
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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.jsx"></script>
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</body>
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</html>

‎examples/flat-cjs/package.json

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{
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"name": "flat-cjs",
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"private": true,
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"version": "0.0.0",
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"type": "module",
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"scripts": {
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"lint": "cross-env ESLINT_USE_FLAT_CONFIG=true eslint . --report-unused-disable-directives"
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},
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"dependencies": {
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"react": "^18.2.0",
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"react-dom": "^18.2.0"
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},
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"devDependencies": {
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"@eslint/js": "^9.5.0",
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"cross-env": "^7.0.3",
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"eslint": "^8.57.0",
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"eslint-plugin-jsx-a11y": "file:../..",
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"globals": "^15.6.0"
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}
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}

‎examples/flat-cjs/public/vite.svg

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‎examples/flat-cjs/src/App.css

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#root {
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max-width: 1280px;
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margin: 0 auto;
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padding: 2rem;
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text-align: center;
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}
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.logo {
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height: 6em;
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padding: 1.5em;
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will-change: filter;
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transition: filter 300ms;
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}
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.logo:hover {
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filter: drop-shadow(0 0 2em #646cffaa);
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}
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.logo.react:hover {
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filter: drop-shadow(0 0 2em #61dafbaa);
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}
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@keyframes logo-spin {
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from {
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transform: rotate(0deg);
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}
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to {
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transform: rotate(360deg);
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}
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}
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@media (prefers-reduced-motion: no-preference) {
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a:nth-of-type(2) .logo {
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animation: logo-spin infinite 20s linear;
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}
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}
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.card {
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padding: 2em;
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}
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.read-the-docs {
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color: #888;
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}

‎examples/flat-cjs/src/App.jsx

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import { useState } from 'react';
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import reactLogo from './assets/react.svg';
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import viteLogo from '/vite.svg';
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import './App.css';
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function App() {
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const [count, setCount] = useState(0);
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return (
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<>
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<div>
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<a href="https://vitejs.dev" target="_blank">
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<img src={viteLogo} className="logo" alt="Vite logo" />
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</a>
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<a href="https://react.dev" target="_blank">
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<img src={reactLogo} className="logo react" alt="React logo" />
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</a>
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<a>click here</a>
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</div>
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<h1>Vite + React</h1>
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<div className="card">
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<button onClick={() => setCount((count) => count + 1)}>
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count is {count}
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</button>
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<p>
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Edit <code>src/App.jsx</code> and save to test HMR
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</p>
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</div>
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<p className="read-the-docs">
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Click on the Vite and React logos to learn more
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</p>
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</>
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);
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}
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export default App;

‎examples/flat-cjs/src/assets/react.svg

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‎examples/flat-cjs/src/index.css

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:root {
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font-family: Inter, system-ui, Avenir, Helvetica, Arial, sans-serif;
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line-height: 1.5;
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font-weight: 400;
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color-scheme: light dark;
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color: rgba(255, 255, 255, 0.87);
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background-color: #242424;
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font-synthesis: none;
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text-rendering: optimizeLegibility;
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-webkit-font-smoothing: antialiased;
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-moz-osx-font-smoothing: grayscale;
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}
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a {
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font-weight: 500;
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color: #646cff;
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text-decoration: inherit;
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}
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a:hover {
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color: #535bf2;
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}
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body {
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margin: 0;
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display: flex;
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place-items: center;
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min-width: 320px;
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min-height: 100vh;
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}
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h1 {
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font-size: 3.2em;
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line-height: 1.1;
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}
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button {
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border-radius: 8px;
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border: 1px solid transparent;
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padding: 0.6em 1.2em;
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font-size: 1em;
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font-weight: 500;
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font-family: inherit;
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background-color: #1a1a1a;
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cursor: pointer;
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transition: border-color 0.25s;
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}
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button:hover {
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border-color: #646cff;
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}
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button:focus,
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button:focus-visible {
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outline: 4px auto -webkit-focus-ring-color;
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}
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@media (prefers-color-scheme: light) {
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:root {
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color: #213547;
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background-color: #ffffff;
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}
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a:hover {
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color: #747bff;
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}
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button {
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background-color: #f9f9f9;
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}
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}

‎examples/flat-cjs/src/main.jsx

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

‎examples/flat-esm/eslint.config.js

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import globals from 'globals';
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import js from '@eslint/js';
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import jsxA11y from 'eslint-plugin-jsx-a11y';
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export default [
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js.configs.recommended,
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jsxA11y.flatConfigs.recommended,
8+
{
9+
files: ['**/*.{js,mjs,cjs,jsx,mjsx,ts,tsx,mtsx}'],
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languageOptions: {
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ecmaVersion: 'latest',
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sourceType: 'module',
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globals: globals.browser,
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},
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ignores: ['dist', 'eslint.config.js'],
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rules: {
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'no-unused-vars': 'off',
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'jsx-a11y/anchor-ambiguous-text': 'warn',
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'jsx-a11y/anchor-is-valid': 'warn',
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},
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},
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];

‎examples/flat-esm/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 + React</title>
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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.jsx"></script>
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</body>
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</html>

‎examples/flat-esm/package.json

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{
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"name": "flat-esm",
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"private": true,
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"version": "0.0.0",
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"type": "module",
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"scripts": {
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"lint": "cross-env ESLINT_USE_FLAT_CONFIG=true eslint . --report-unused-disable-directives"
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},
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"dependencies": {
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"react": "^18.2.0",
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"react-dom": "^18.2.0"
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},
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"devDependencies": {
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"@eslint/js": "^9.5.0",
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"cross-env": "^7.0.3",
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"eslint": "^8.57.0",
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"eslint-plugin-jsx-a11y": "file:../..",
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"globals": "^15.6.0"
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}
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}

‎examples/flat-esm/public/vite.svg

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‎examples/flat-esm/src/App.css

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#root {
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max-width: 1280px;
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margin: 0 auto;
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padding: 2rem;
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text-align: center;
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}
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.logo {
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height: 6em;
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padding: 1.5em;
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will-change: filter;
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transition: filter 300ms;
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}
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.logo:hover {
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filter: drop-shadow(0 0 2em #646cffaa);
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}
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.logo.react:hover {
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filter: drop-shadow(0 0 2em #61dafbaa);
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}
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@keyframes logo-spin {
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from {
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transform: rotate(0deg);
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}
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to {
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transform: rotate(360deg);
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}
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}
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@media (prefers-reduced-motion: no-preference) {
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a:nth-of-type(2) .logo {
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animation: logo-spin infinite 20s linear;
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}
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}
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.card {
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padding: 2em;
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}
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.read-the-docs {
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color: #888;
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}

‎examples/flat-esm/src/App.jsx

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import { useState } from 'react';
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import reactLogo from './assets/react.svg';
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import viteLogo from '/vite.svg';
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import './App.css';
5+
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function App() {
7+
const [count, setCount] = useState(0);
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return (
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<>
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<div>
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<a href="https://vitejs.dev" target="_blank">
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<img src={viteLogo} className="logo" alt="Vite logo" />
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</a>
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<a href="https://react.dev" target="_blank">
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<img src={reactLogo} className="logo react" alt="React logo" />
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</a>
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<a>click here</a>
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</div>
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<h1>Vite + React</h1>
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<div className="card">
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<button onClick={() => setCount((count) => count + 1)}>
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count is {count}
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</button>
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<p>
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Edit <code>src/App.jsx</code> and save to test HMR
27+
</p>
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</div>
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<p className="read-the-docs">
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Click on the Vite and React logos to learn more
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</p>
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</>
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);
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}
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export default App;

‎examples/flat-esm/src/assets/react.svg

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‎examples/flat-esm/src/index.css

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:root {
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font-family: Inter, system-ui, Avenir, Helvetica, Arial, sans-serif;
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line-height: 1.5;
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font-weight: 400;
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color-scheme: light dark;
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color: rgba(255, 255, 255, 0.87);
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background-color: #242424;
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font-synthesis: none;
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text-rendering: optimizeLegibility;
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-webkit-font-smoothing: antialiased;
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-moz-osx-font-smoothing: grayscale;
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}
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a {
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font-weight: 500;
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color: #646cff;
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text-decoration: inherit;
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}
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a:hover {
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color: #535bf2;
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}
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body {
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margin: 0;
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display: flex;
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place-items: center;
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min-width: 320px;
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min-height: 100vh;
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}
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h1 {
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font-size: 3.2em;
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line-height: 1.1;
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}
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button {
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border-radius: 8px;
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border: 1px solid transparent;
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padding: 0.6em 1.2em;
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font-size: 1em;
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font-weight: 500;
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font-family: inherit;
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background-color: #1a1a1a;
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cursor: pointer;
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transition: border-color 0.25s;
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}
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button:hover {
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border-color: #646cff;
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}
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button:focus,
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button:focus-visible {
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outline: 4px auto -webkit-focus-ring-color;
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}
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@media (prefers-color-scheme: light) {
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:root {
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color: #213547;
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background-color: #ffffff;
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}
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a:hover {
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color: #747bff;
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}
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button {
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background-color: #f9f9f9;
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}
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}

‎examples/flat-esm/src/main.jsx

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import React from 'react'
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import ReactDOM from 'react-dom/client'
3+
import App from './App.jsx'
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import './index.css'
5+
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ReactDOM.createRoot(document.getElementById('root')).render(
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<React.StrictMode>
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<App />
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</React.StrictMode>,
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)

‎examples/legacy/.eslintrc.cjs

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module.exports = {
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root: true,
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env: { browser: true, es2020: true },
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extends: ['eslint:recommended', 'plugin:jsx-a11y/recommended'],
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ignorePatterns: ['dist', '.eslintrc.cjs'],
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parserOptions: {
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ecmaVersion: 'latest',
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sourceType: 'module',
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},
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settings: { react: { version: '18.2' } },
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plugins: ['jsx-a11y'],
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rules: {
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'no-unused-vars': 'off',
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'jsx-a11y/anchor-ambiguous-text': 'warn',
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'jsx-a11y/anchor-is-valid': 'warn',
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},
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};

‎examples/legacy/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 + React</title>
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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.jsx"></script>
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</body>
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</html>

‎examples/legacy/package.json

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{
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"name": "legacy",
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"private": true,
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"version": "0.0.0",
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"type": "module",
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"scripts": {
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"lint": "cross-env ESLINT_USE_FLAT_CONFIG=false eslint . --ext js,jsx --report-unused-disable-directives"
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},
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"dependencies": {
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"react": "^18.2.0",
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"react-dom": "^18.2.0"
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},
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"devDependencies": {
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"cross-env": "^7.0.3",
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"eslint": "^8.57.0",
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"eslint-plugin-jsx-a11y": "file:../.."
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}
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}

‎examples/legacy/public/vite.svg

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‎examples/legacy/src/App.css

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#root {
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max-width: 1280px;
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margin: 0 auto;
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padding: 2rem;
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text-align: center;
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}
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.logo {
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height: 6em;
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padding: 1.5em;
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will-change: filter;
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transition: filter 300ms;
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}
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.logo:hover {
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filter: drop-shadow(0 0 2em #646cffaa);
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}
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.logo.react:hover {
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filter: drop-shadow(0 0 2em #61dafbaa);
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}
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@keyframes logo-spin {
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from {
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transform: rotate(0deg);
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}
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to {
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transform: rotate(360deg);
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}
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}
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@media (prefers-reduced-motion: no-preference) {
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a:nth-of-type(2) .logo {
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animation: logo-spin infinite 20s linear;
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}
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}
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.card {
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padding: 2em;
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}
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.read-the-docs {
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color: #888;
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}

‎examples/legacy/src/App.jsx

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import { useState } from 'react';
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import reactLogo from './assets/react.svg';
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import viteLogo from '/vite.svg';
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import './App.css';
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function App() {
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const [count, setCount] = useState(0);
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return (
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<>
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<div>
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<a href="https://vitejs.dev" target="_blank">
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<img src={viteLogo} className="logo" alt="Vite logo" />
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</a>
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<a href="https://react.dev" target="_blank">
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<img src={reactLogo} className="logo react" alt="React logo" />
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</a>
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<a>click here</a>
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</div>
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<h1>Vite + React</h1>
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<div className="card">
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<button onClick={() => setCount((count) => count + 1)}>
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count is {count}
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</button>
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<p>
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Edit <code>src/App.jsx</code> and save to test HMR
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</p>
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</div>
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<p className="read-the-docs">
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Click on the Vite and React logos to learn more
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</p>
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</>
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);
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}
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export default App;

‎examples/legacy/src/assets/react.svg

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Loading

‎examples/legacy/src/index.css

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:root {
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font-family: Inter, system-ui, Avenir, Helvetica, Arial, sans-serif;
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line-height: 1.5;
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font-weight: 400;
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color-scheme: light dark;
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color: rgba(255, 255, 255, 0.87);
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background-color: #242424;
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font-synthesis: none;
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text-rendering: optimizeLegibility;
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-webkit-font-smoothing: antialiased;
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-moz-osx-font-smoothing: grayscale;
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}
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a {
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font-weight: 500;
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color: #646cff;
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text-decoration: inherit;
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}
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a:hover {
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color: #535bf2;
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}
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body {
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margin: 0;
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display: flex;
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place-items: center;
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min-width: 320px;
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min-height: 100vh;
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}
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h1 {
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font-size: 3.2em;
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line-height: 1.1;
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}
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button {
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border-radius: 8px;
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border: 1px solid transparent;
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padding: 0.6em 1.2em;
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font-size: 1em;
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font-weight: 500;
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font-family: inherit;
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background-color: #1a1a1a;
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cursor: pointer;
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transition: border-color 0.25s;
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}
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button:hover {
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border-color: #646cff;
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}
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button:focus,
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button:focus-visible {
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outline: 4px auto -webkit-focus-ring-color;
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}
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@media (prefers-color-scheme: light) {
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:root {
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color: #213547;
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background-color: #ffffff;
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}
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a:hover {
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color: #747bff;
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}
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button {
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background-color: #f9f9f9;
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}
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}

‎examples/legacy/src/main.jsx

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

‎package.json

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"test": "npm run jest",
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"posttest": "aud --production",
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"test:ci": "npm run jest -- --ci --runInBand",
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"pretest:examples": "npm run build",
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"test:examples": "npm run test-example:legacy && npm run test-example:flat-esm && npm run test-example:flat-cjs",
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"test-example:legacy": "cd examples/legacy && npm install && npm run lint",
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"test-example:flat-esm": "cd examples/flat-esm && npm install && npm run lint",
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"test-example:flat-cjs": "cd examples/flat-cjs && npm install && npm run lint",
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"jest": "jest --coverage __tests__/**/*",
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"pregenerate-list-of-rules": "npm run build",
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"generate-list-of-rules": "eslint-doc-generator --rule-doc-title-format prefix-name --rule-doc-section-options false --config-emoji recommended,☑️",
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"generate-list-of-rules": "eslint-doc-generator --rule-doc-title-format prefix-name --rule-doc-section-options false --config-emoji recommended,☑️ --ignore-config flat/recommended --ignore-config flat/strict",
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"generate-list-of-rules:check": "npm run generate-list-of-rules -- --check",
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"version": "auto-changelog && git add CHANGELOG.md",
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"postversion": "auto-changelog && git add CHANGELOG.md && git commit --no-edit --amend && git tag -f \"v$(node -e \"console.log(require('./package.json').version)\")\""
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"/reports",
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"/flow",
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"scripts/",
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"CONTRIBUTING.md"
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"CONTRIBUTING.md",
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"/examples"
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]
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}
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}

‎src/configs/flat-config-base.js

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module.exports = {
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languageOptions: {
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parserOptions: {
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ecmaFeatures: {
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jsx: true,
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},
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},
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},
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};

‎src/configs/legacy-config-base.js

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module.exports = {
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parserOptions: {
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ecmaFeatures: {
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jsx: true,
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},
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},
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};

‎src/index.js

+313-289
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