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    <title>DEV Community: Marcos Dias</title>
    <description>The latest articles on DEV Community by Marcos Dias (@marcosdiasdev).</description>
    <link>https://dev.to/marcosdiasdev</link>
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    <item>
      <title>Using @/ path mapping on Create React App projects</title>
      <dc:creator>Marcos Dias</dc:creator>
      <pubDate>Wed, 05 Jul 2023 21:55:13 +0000</pubDate>
      <link>https://dev.to/marcosdiasdev/using-path-aliases-on-create-react-app-projects-686</link>
      <guid>https://dev.to/marcosdiasdev/using-path-aliases-on-create-react-app-projects-686</guid>
      <description>&lt;p&gt;&lt;a href="https://media.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2F0ma4s7iku4d3vhv8iqaw.jpg" class="article-body-image-wrapper"&gt;&lt;img src="https://media.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2F0ma4s7iku4d3vhv8iqaw.jpg" alt="Path Mapping in a Map"&gt;&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;I recently configured an old project created with Create React App (CRA) to use path mapping/aliasing like &lt;code&gt;@atoms&lt;/code&gt;, &lt;code&gt;@molecules&lt;/code&gt; or &lt;code&gt;@organisms&lt;/code&gt;.&lt;/p&gt;

&lt;p&gt;After using NextJS for a while, I got used to the idea of using &lt;code&gt;@/&lt;/code&gt; instead of just &lt;code&gt;@&lt;/code&gt; as a prefix for path mapping as it makes it a little bit clearer what is a path alias and what's not, like &lt;code&gt;@apollo-client&lt;/code&gt; or &lt;code&gt;@fortawesome&lt;/code&gt;. &lt;/p&gt;

&lt;p&gt;The point in this post is how to enable your project to use &lt;code&gt;@/&lt;/code&gt; path mapping, but you can use the same settings to be able to use any other aliases, like &lt;code&gt;@utils&lt;/code&gt; or just &lt;code&gt;utils&lt;/code&gt;.&lt;/p&gt;

&lt;h2&gt;
  
  
  Configuring the path mapping
&lt;/h2&gt;

&lt;p&gt;Considering you're using CRA, the first thing is to install &lt;code&gt;@craco/craco&lt;/code&gt; in your project to enable overriding original CRA's configuration.&lt;/p&gt;

&lt;p&gt;To install &lt;code&gt;@craco/craco&lt;/code&gt;, just run:&lt;/p&gt;

&lt;div class="highlight js-code-highlight"&gt;
&lt;pre class="highlight shell"&gt;&lt;code&gt;

yarn add &lt;span class="nt"&gt;-D&lt;/span&gt; @craco/craco


&lt;/code&gt;&lt;/pre&gt;

&lt;/div&gt;

&lt;p&gt;or&lt;/p&gt;

&lt;div class="highlight js-code-highlight"&gt;
&lt;pre class="highlight shell"&gt;&lt;code&gt;

npm i &lt;span class="nt"&gt;-D&lt;/span&gt; @craco/craco


&lt;/code&gt;&lt;/pre&gt;

&lt;/div&gt;

&lt;p&gt;After installing &lt;code&gt;@craco/craco&lt;/code&gt;, in your &lt;code&gt;package.json&lt;/code&gt;, update your &lt;code&gt;start&lt;/code&gt;, &lt;code&gt;build&lt;/code&gt; and &lt;code&gt;test&lt;/code&gt; scripts to use &lt;code&gt;craco&lt;/code&gt; instead of &lt;code&gt;react-scripts&lt;/code&gt;, like recommended in &lt;a href="https://www.npmjs.com/package/@craco/craco" rel="noopener noreferrer"&gt;CRACO's docs&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;And then create a &lt;code&gt;craco.config.js&lt;/code&gt; file in your project's root adding your aliases to the &lt;code&gt;alias&lt;/code&gt; property of the &lt;code&gt;webpack&lt;/code&gt; property, where the key should be the alias's name and the value its path:&lt;/p&gt;

&lt;div class="highlight js-code-highlight"&gt;
&lt;pre class="highlight javascript"&gt;&lt;code&gt;

&lt;span class="kd"&gt;const&lt;/span&gt; &lt;span class="nx"&gt;path&lt;/span&gt; &lt;span class="o"&gt;=&lt;/span&gt; &lt;span class="nf"&gt;require&lt;/span&gt;&lt;span class="p"&gt;(&lt;/span&gt;&lt;span class="dl"&gt;'&lt;/span&gt;&lt;span class="s1"&gt;path&lt;/span&gt;&lt;span class="dl"&gt;'&lt;/span&gt;&lt;span class="p"&gt;);&lt;/span&gt;

&lt;span class="nx"&gt;module&lt;/span&gt;&lt;span class="p"&gt;.&lt;/span&gt;&lt;span class="nx"&gt;exports&lt;/span&gt; &lt;span class="o"&gt;=&lt;/span&gt; &lt;span class="p"&gt;{&lt;/span&gt;
  &lt;span class="na"&gt;webpack&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt; &lt;span class="p"&gt;{&lt;/span&gt;
    &lt;span class="na"&gt;alias&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt; &lt;span class="p"&gt;{&lt;/span&gt;
      &lt;span class="dl"&gt;'&lt;/span&gt;&lt;span class="s1"&gt;@atoms&lt;/span&gt;&lt;span class="dl"&gt;'&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt; &lt;span class="nx"&gt;path&lt;/span&gt;&lt;span class="p"&gt;.&lt;/span&gt;&lt;span class="nf"&gt;resolve&lt;/span&gt;&lt;span class="p"&gt;(&lt;/span&gt;&lt;span class="nx"&gt;__dirname&lt;/span&gt;&lt;span class="p"&gt;,&lt;/span&gt; &lt;span class="dl"&gt;'&lt;/span&gt;&lt;span class="s1"&gt;./src/atoms&lt;/span&gt;&lt;span class="dl"&gt;'&lt;/span&gt;&lt;span class="p"&gt;),&lt;/span&gt;
      &lt;span class="dl"&gt;'&lt;/span&gt;&lt;span class="s1"&gt;@molecules&lt;/span&gt;&lt;span class="dl"&gt;'&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt; &lt;span class="nx"&gt;path&lt;/span&gt;&lt;span class="p"&gt;.&lt;/span&gt;&lt;span class="nf"&gt;resolve&lt;/span&gt;&lt;span class="p"&gt;(&lt;/span&gt;&lt;span class="nx"&gt;__dirname&lt;/span&gt;&lt;span class="p"&gt;,&lt;/span&gt; &lt;span class="dl"&gt;'&lt;/span&gt;&lt;span class="s1"&gt;./src/molecules&lt;/span&gt;&lt;span class="dl"&gt;'&lt;/span&gt;&lt;span class="p"&gt;),&lt;/span&gt;
    &lt;span class="p"&gt;},&lt;/span&gt;
  &lt;span class="p"&gt;},&lt;/span&gt;
&lt;span class="p"&gt;};&lt;/span&gt;


&lt;/code&gt;&lt;/pre&gt;

&lt;/div&gt;

&lt;p&gt;If you're using TypeScript, you should add those same path aliases to your &lt;code&gt;tsconfig&lt;/code&gt; file. In your &lt;code&gt;tsconfig&lt;/code&gt; file, look for &lt;code&gt;compilerOptions&lt;/code&gt; and add a &lt;code&gt;paths&lt;/code&gt; object like the following:&lt;/p&gt;

&lt;div class="highlight js-code-highlight"&gt;
&lt;pre class="highlight json"&gt;&lt;code&gt;&lt;span class="w"&gt;

&lt;/span&gt;&lt;span class="p"&gt;{&lt;/span&gt;&lt;span class="w"&gt;
  &lt;/span&gt;&lt;span class="nl"&gt;"compilerOptions"&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt;&lt;span class="w"&gt; &lt;/span&gt;&lt;span class="p"&gt;{&lt;/span&gt;&lt;span class="w"&gt;
    &lt;/span&gt;&lt;span class="nl"&gt;"paths"&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt;&lt;span class="w"&gt; &lt;/span&gt;&lt;span class="p"&gt;{&lt;/span&gt;&lt;span class="w"&gt;
      &lt;/span&gt;&lt;span class="nl"&gt;"@atoms/*"&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt;&lt;span class="w"&gt; &lt;/span&gt;&lt;span class="p"&gt;[&lt;/span&gt;&lt;span class="w"&gt;
        &lt;/span&gt;&lt;span class="s2"&gt;"./src/atoms/*"&lt;/span&gt;&lt;span class="w"&gt;
      &lt;/span&gt;&lt;span class="p"&gt;],&lt;/span&gt;&lt;span class="w"&gt;
      &lt;/span&gt;&lt;span class="nl"&gt;"@molecules/*"&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt;&lt;span class="w"&gt; &lt;/span&gt;&lt;span class="p"&gt;[&lt;/span&gt;&lt;span class="w"&gt;
        &lt;/span&gt;&lt;span class="s2"&gt;"./src/molecules/*"&lt;/span&gt;&lt;span class="w"&gt;
      &lt;/span&gt;&lt;span class="p"&gt;],&lt;/span&gt;&lt;span class="w"&gt;
    &lt;/span&gt;&lt;span class="p"&gt;}&lt;/span&gt;&lt;span class="w"&gt;
  &lt;/span&gt;&lt;span class="p"&gt;}&lt;/span&gt;&lt;span class="w"&gt;
&lt;/span&gt;&lt;span class="p"&gt;}&lt;/span&gt;&lt;span class="w"&gt;


&lt;/span&gt;&lt;/code&gt;&lt;/pre&gt;

&lt;/div&gt;

&lt;p&gt;At this point, you should be able to import your components using the aliases you just defined:&lt;/p&gt;

&lt;div class="highlight js-code-highlight"&gt;
&lt;pre class="highlight typescript"&gt;&lt;code&gt;

&lt;span class="k"&gt;import&lt;/span&gt; &lt;span class="nx"&gt;Button&lt;/span&gt; &lt;span class="k"&gt;from&lt;/span&gt; &lt;span class="dl"&gt;'&lt;/span&gt;&lt;span class="s1"&gt;@atoms/Button&lt;/span&gt;&lt;span class="dl"&gt;'&lt;/span&gt;&lt;span class="p"&gt;;&lt;/span&gt; 
&lt;span class="k"&gt;import&lt;/span&gt; &lt;span class="nx"&gt;Table&lt;/span&gt; &lt;span class="k"&gt;from&lt;/span&gt; &lt;span class="dl"&gt;'&lt;/span&gt;&lt;span class="s1"&gt;@molecules/Table&lt;/span&gt;&lt;span class="dl"&gt;'&lt;/span&gt;


&lt;/code&gt;&lt;/pre&gt;

&lt;/div&gt;

&lt;p&gt;Remember &lt;code&gt;@atoms&lt;/code&gt; and &lt;code&gt;@molecules&lt;/code&gt; are just examples. You can use any other aliases.&lt;/p&gt;

&lt;h2&gt;
  
  
  Allowing @/ path aliases
&lt;/h2&gt;

&lt;p&gt;If you prefer to use &lt;code&gt;@/&lt;/code&gt; instead of &lt;code&gt;@&lt;/code&gt; as the alias prefix, you might face some trouble with ESLint as it might be complaining about missing file extensions on your imports:&lt;/p&gt;

&lt;div class="highlight js-code-highlight"&gt;
&lt;pre class="highlight shell"&gt;&lt;code&gt;

Missing file extension &lt;span class="k"&gt;for&lt;/span&gt; &lt;span class="s2"&gt;"@/pages/MainPage"&lt;/span&gt; eslint&lt;span class="o"&gt;(&lt;/span&gt;import/extensions&lt;span class="o"&gt;)&lt;/span&gt;


&lt;/code&gt;&lt;/pre&gt;

&lt;/div&gt;

&lt;p&gt;To allow ESLint to understand &lt;code&gt;@/&lt;/code&gt; aliases, you'll have to install the &lt;code&gt;eslint-import-resolver-typescript&lt;/code&gt; plugin.&lt;/p&gt;

&lt;p&gt;Run&lt;/p&gt;

&lt;div class="highlight js-code-highlight"&gt;
&lt;pre class="highlight shell"&gt;&lt;code&gt;

yarn add &lt;span class="nt"&gt;-D&lt;/span&gt; eslint-import-resolver-typescript


&lt;/code&gt;&lt;/pre&gt;

&lt;/div&gt;

&lt;p&gt;or&lt;/p&gt;

&lt;div class="highlight js-code-highlight"&gt;
&lt;pre class="highlight shell"&gt;&lt;code&gt;

npm i &lt;span class="nt"&gt;-D&lt;/span&gt; eslint-import-resolver-typescript


&lt;/code&gt;&lt;/pre&gt;

&lt;/div&gt;

&lt;p&gt;Then, go to your &lt;code&gt;.eslintrc&lt;/code&gt; file and add the following configuration within the &lt;code&gt;settings&lt;/code&gt; section:&lt;/p&gt;

&lt;div class="highlight js-code-highlight"&gt;
&lt;pre class="highlight json"&gt;&lt;code&gt;&lt;span class="w"&gt;

  &lt;/span&gt;&lt;span class="nl"&gt;"settings"&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt;&lt;span class="w"&gt; &lt;/span&gt;&lt;span class="p"&gt;{&lt;/span&gt;&lt;span class="w"&gt;
    &lt;/span&gt;&lt;span class="nl"&gt;"import/resolver"&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt;&lt;span class="w"&gt; &lt;/span&gt;&lt;span class="p"&gt;{&lt;/span&gt;&lt;span class="w"&gt;
      &lt;/span&gt;&lt;span class="nl"&gt;"typescript"&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt;&lt;span class="w"&gt; &lt;/span&gt;&lt;span class="p"&gt;{}&lt;/span&gt;&lt;span class="w"&gt;
    &lt;/span&gt;&lt;span class="p"&gt;}&lt;/span&gt;&lt;span class="w"&gt;
  &lt;/span&gt;&lt;span class="p"&gt;}&lt;/span&gt;&lt;span class="w"&gt;


&lt;/span&gt;&lt;/code&gt;&lt;/pre&gt;

&lt;/div&gt;

&lt;p&gt;Now ESLint should've stopped complaining about missing file extensions. If you're still getting a warning about extensions, check your &lt;code&gt;import/extensions&lt;/code&gt; rule inside the &lt;code&gt;rules&lt;/code&gt; section. You can read more about this rule &lt;a href="https://github.com/import-js/eslint-plugin-import/blob/main/docs/rules/extensions.md" rel="noopener noreferrer"&gt;here&lt;/a&gt;.&lt;/p&gt;

&lt;h2&gt;
  
  
  🎁 Bonus round: enabling Jest to use path aliases
&lt;/h2&gt;

&lt;p&gt;Again, considering you're using TypeScript, to allow Jest to read your path aliases you'll have to install and configure &lt;code&gt;ts-jest&lt;/code&gt;.&lt;/p&gt;

&lt;p&gt;Run&lt;/p&gt;

&lt;div class="highlight js-code-highlight"&gt;
&lt;pre class="highlight shell"&gt;&lt;code&gt;

yarn add &lt;span class="nt"&gt;-D&lt;/span&gt; ts-jest


&lt;/code&gt;&lt;/pre&gt;

&lt;/div&gt;

&lt;p&gt;or&lt;/p&gt;

&lt;div class="highlight js-code-highlight"&gt;
&lt;pre class="highlight shell"&gt;&lt;code&gt;

npm i &lt;span class="nt"&gt;-D&lt;/span&gt; ts-jest


&lt;/code&gt;&lt;/pre&gt;

&lt;/div&gt;

&lt;p&gt;After installing &lt;code&gt;ts-jest&lt;/code&gt;, update your &lt;code&gt;craco.config.js&lt;/code&gt; file like the following, telling Jest to use the paths configured in your &lt;code&gt;tsconfig&lt;/code&gt; file:&lt;/p&gt;

&lt;div class="highlight js-code-highlight"&gt;
&lt;pre class="highlight javascript"&gt;&lt;code&gt;

&lt;span class="kd"&gt;const&lt;/span&gt; &lt;span class="nx"&gt;path&lt;/span&gt; &lt;span class="o"&gt;=&lt;/span&gt; &lt;span class="nf"&gt;require&lt;/span&gt;&lt;span class="p"&gt;(&lt;/span&gt;&lt;span class="dl"&gt;'&lt;/span&gt;&lt;span class="s1"&gt;path&lt;/span&gt;&lt;span class="dl"&gt;'&lt;/span&gt;&lt;span class="p"&gt;);&lt;/span&gt;
&lt;span class="kd"&gt;const&lt;/span&gt; &lt;span class="p"&gt;{&lt;/span&gt; &lt;span class="nx"&gt;pathsToModuleNameMapper&lt;/span&gt; &lt;span class="p"&gt;}&lt;/span&gt; &lt;span class="o"&gt;=&lt;/span&gt; &lt;span class="nf"&gt;require&lt;/span&gt;&lt;span class="p"&gt;(&lt;/span&gt;&lt;span class="dl"&gt;'&lt;/span&gt;&lt;span class="s1"&gt;ts-jest&lt;/span&gt;&lt;span class="dl"&gt;'&lt;/span&gt;&lt;span class="p"&gt;);&lt;/span&gt;
&lt;span class="kd"&gt;const&lt;/span&gt; &lt;span class="p"&gt;{&lt;/span&gt; &lt;span class="nx"&gt;compilerOptions&lt;/span&gt; &lt;span class="p"&gt;}&lt;/span&gt; &lt;span class="o"&gt;=&lt;/span&gt; &lt;span class="nf"&gt;require&lt;/span&gt;&lt;span class="p"&gt;(&lt;/span&gt;&lt;span class="dl"&gt;'&lt;/span&gt;&lt;span class="s1"&gt;./tsconfig.json&lt;/span&gt;&lt;span class="dl"&gt;'&lt;/span&gt;&lt;span class="p"&gt;);&lt;/span&gt;

&lt;span class="nx"&gt;module&lt;/span&gt;&lt;span class="p"&gt;.&lt;/span&gt;&lt;span class="nx"&gt;exports&lt;/span&gt; &lt;span class="o"&gt;=&lt;/span&gt; &lt;span class="p"&gt;{&lt;/span&gt;
  &lt;span class="na"&gt;webpack&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt; &lt;span class="p"&gt;{&lt;/span&gt;
    &lt;span class="na"&gt;alias&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt; &lt;span class="p"&gt;{&lt;/span&gt;
      &lt;span class="dl"&gt;'&lt;/span&gt;&lt;span class="s1"&gt;@atoms&lt;/span&gt;&lt;span class="dl"&gt;'&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt; &lt;span class="nx"&gt;path&lt;/span&gt;&lt;span class="p"&gt;.&lt;/span&gt;&lt;span class="nf"&gt;resolve&lt;/span&gt;&lt;span class="p"&gt;(&lt;/span&gt;&lt;span class="nx"&gt;__dirname&lt;/span&gt;&lt;span class="p"&gt;,&lt;/span&gt; &lt;span class="dl"&gt;'&lt;/span&gt;&lt;span class="s1"&gt;./src/atoms&lt;/span&gt;&lt;span class="dl"&gt;'&lt;/span&gt;&lt;span class="p"&gt;),&lt;/span&gt;
      &lt;span class="dl"&gt;'&lt;/span&gt;&lt;span class="s1"&gt;@molecules&lt;/span&gt;&lt;span class="dl"&gt;'&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt; &lt;span class="nx"&gt;path&lt;/span&gt;&lt;span class="p"&gt;.&lt;/span&gt;&lt;span class="nf"&gt;resolve&lt;/span&gt;&lt;span class="p"&gt;(&lt;/span&gt;&lt;span class="nx"&gt;__dirname&lt;/span&gt;&lt;span class="p"&gt;,&lt;/span&gt; &lt;span class="dl"&gt;'&lt;/span&gt;&lt;span class="s1"&gt;./src/molecules&lt;/span&gt;&lt;span class="dl"&gt;'&lt;/span&gt;&lt;span class="p"&gt;),&lt;/span&gt;
    &lt;span class="p"&gt;},&lt;/span&gt;
  &lt;span class="p"&gt;},&lt;/span&gt;
  &lt;span class="na"&gt;jest&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt; &lt;span class="p"&gt;{&lt;/span&gt;
    &lt;span class="na"&gt;configure&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt; &lt;span class="p"&gt;{&lt;/span&gt;
      &lt;span class="na"&gt;preset&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt; &lt;span class="dl"&gt;'&lt;/span&gt;&lt;span class="s1"&gt;ts-jest&lt;/span&gt;&lt;span class="dl"&gt;'&lt;/span&gt;&lt;span class="p"&gt;,&lt;/span&gt;
      &lt;span class="na"&gt;moduleNameMapper&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt; &lt;span class="nf"&gt;pathsToModuleNameMapper&lt;/span&gt;&lt;span class="p"&gt;(&lt;/span&gt;&lt;span class="nx"&gt;compilerOptions&lt;/span&gt;&lt;span class="p"&gt;.&lt;/span&gt;&lt;span class="nx"&gt;paths&lt;/span&gt;&lt;span class="p"&gt;,&lt;/span&gt; &lt;span class="p"&gt;{&lt;/span&gt;
        &lt;span class="na"&gt;prefix&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt; &lt;span class="dl"&gt;'&lt;/span&gt;&lt;span class="s1"&gt;&amp;lt;rootDir&amp;gt;/&lt;/span&gt;&lt;span class="dl"&gt;'&lt;/span&gt;&lt;span class="p"&gt;,&lt;/span&gt;
      &lt;span class="p"&gt;}),&lt;/span&gt;
    &lt;span class="p"&gt;},&lt;/span&gt;
  &lt;span class="p"&gt;},&lt;/span&gt;
&lt;span class="p"&gt;};&lt;/span&gt;


&lt;/code&gt;&lt;/pre&gt;

&lt;/div&gt;

&lt;p&gt;That's it! You now should be able to use path mapping in your project, including your unit tests and also using &lt;code&gt;@/&lt;/code&gt; path aliases.&lt;/p&gt;

</description>
      <category>react</category>
      <category>path</category>
      <category>mapping</category>
      <category>alias</category>
    </item>
    <item>
      <title>Adding ESLint and Prettier to a ViteJS React project</title>
      <dc:creator>Marcos Dias</dc:creator>
      <pubDate>Sat, 21 Jan 2023 18:28:17 +0000</pubDate>
      <link>https://dev.to/marcosdiasdev/adding-eslint-and-prettier-to-a-vitejs-react-project-2kkj</link>
      <guid>https://dev.to/marcosdiasdev/adding-eslint-and-prettier-to-a-vitejs-react-project-2kkj</guid>
      <description>&lt;p&gt;Recently, I decided to try &lt;a href="https://vitejs.dev/guide/why.html" rel="noopener noreferrer"&gt;ViteJS&lt;/a&gt; as an alternative to Create React App. Although ViteJS already offers a basic template for React applications it doesn't come shipped with ESLint and Prettier. In this post, we will briefly go through the installation and configuration of those two packages in a React project created with ViteJS.&lt;/p&gt;

&lt;h2&gt;
  
  
  Step 1: install dependencies
&lt;/h2&gt;

&lt;p&gt;Beside ESLint and Prettier, we will install the following dependencies:&lt;/p&gt;

&lt;ul&gt;
&lt;li&gt;
&lt;code&gt;@typescript-eslint/eslint-plugin&lt;/code&gt;: a collection of linting rules for TypeScript projects.&lt;/li&gt;
&lt;li&gt;
&lt;code&gt;@typescript-eslint/parser&lt;/code&gt;: a code parser for TypeScript.&lt;/li&gt;
&lt;li&gt;
&lt;code&gt;eslint-config-prettier&lt;/code&gt;: an ESLint configuration to disable conflicting rules between ESLint and Prettier.&lt;/li&gt;
&lt;li&gt;
&lt;code&gt;eslint-plugin-import&lt;/code&gt;: a plugin to enable ESLint to handle ES6+ &lt;code&gt;import&lt;/code&gt;/&lt;code&gt;export&lt;/code&gt; syntax.&lt;/li&gt;
&lt;li&gt;
&lt;code&gt;eslint-plugin-jsx-a11y&lt;/code&gt;: a plugin with some accessibility rules.&lt;/li&gt;
&lt;li&gt;
&lt;code&gt;eslint-plugin-react&lt;/code&gt;: a plugin with rules for React projects.&lt;/li&gt;
&lt;li&gt;
&lt;code&gt;eslint-plugin-react-hooks&lt;/code&gt;: a plugin with rules for React hooks. It will ensure that you never use a React hook outside of a function component.&lt;/li&gt;
&lt;/ul&gt;

&lt;p&gt;To install all of these dependencies, just run the following line:&lt;/p&gt;

&lt;div class="highlight js-code-highlight"&gt;
&lt;pre class="highlight shell"&gt;&lt;code&gt;

yarn add &lt;span class="nt"&gt;-D&lt;/span&gt; eslint prettier @typescript-eslint/eslint-plugin @typescript-eslint/parser eslint-config-prettier eslint-plugin-import eslint-plugin-jsx-a11y eslint-plugin-react eslint-plugin-react-hooks


&lt;/code&gt;&lt;/pre&gt;

&lt;/div&gt;

&lt;p&gt;If you're using &lt;code&gt;npm&lt;/code&gt; as a package manager, replace &lt;code&gt;yarn add -D&lt;/code&gt; by &lt;code&gt;npm install --dev&lt;/code&gt;.&lt;/p&gt;

&lt;h2&gt;
  
  
  Step 2: configure ESLint
&lt;/h2&gt;

&lt;p&gt;With the dependencies already installed, it's time to create the configuration files for ESLint. First, we will create the &lt;code&gt;.eslintrc&lt;/code&gt;, which will manage our ESLint configuration.&lt;/p&gt;

&lt;blockquote&gt;
&lt;p&gt;All the following files should be created in the project's root folder.&lt;/p&gt;
&lt;/blockquote&gt;

&lt;p&gt;&lt;code&gt;.eslintrc&lt;/code&gt;&lt;/p&gt;

&lt;div class="highlight js-code-highlight"&gt;
&lt;pre class="highlight json"&gt;&lt;code&gt;&lt;span class="w"&gt;

&lt;/span&gt;&lt;span class="p"&gt;{&lt;/span&gt;&lt;span class="w"&gt;
  &lt;/span&gt;&lt;span class="nl"&gt;"extends"&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt;&lt;span class="w"&gt; &lt;/span&gt;&lt;span class="p"&gt;[&lt;/span&gt;&lt;span class="w"&gt;
    &lt;/span&gt;&lt;span class="s2"&gt;"eslint:recommended"&lt;/span&gt;&lt;span class="p"&gt;,&lt;/span&gt;&lt;span class="w"&gt;
    &lt;/span&gt;&lt;span class="s2"&gt;"plugin:react/recommended"&lt;/span&gt;&lt;span class="p"&gt;,&lt;/span&gt;&lt;span class="w"&gt;
    &lt;/span&gt;&lt;span class="s2"&gt;"plugin:react-hooks/recommended"&lt;/span&gt;&lt;span class="p"&gt;,&lt;/span&gt;&lt;span class="w"&gt;
    &lt;/span&gt;&lt;span class="s2"&gt;"plugin:import/recommended"&lt;/span&gt;&lt;span class="p"&gt;,&lt;/span&gt;&lt;span class="w"&gt;
    &lt;/span&gt;&lt;span class="s2"&gt;"plugin:jsx-a11y/recommended"&lt;/span&gt;&lt;span class="p"&gt;,&lt;/span&gt;&lt;span class="w"&gt;
    &lt;/span&gt;&lt;span class="s2"&gt;"plugin:@typescript-eslint/recommended"&lt;/span&gt;&lt;span class="p"&gt;,&lt;/span&gt;&lt;span class="w"&gt;
    &lt;/span&gt;&lt;span class="s2"&gt;"eslint-config-prettier"&lt;/span&gt;&lt;span class="w"&gt;
  &lt;/span&gt;&lt;span class="p"&gt;],&lt;/span&gt;&lt;span class="w"&gt;
  &lt;/span&gt;&lt;span class="nl"&gt;"settings"&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt;&lt;span class="w"&gt; &lt;/span&gt;&lt;span class="p"&gt;{&lt;/span&gt;&lt;span class="w"&gt;
    &lt;/span&gt;&lt;span class="nl"&gt;"react"&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt;&lt;span class="w"&gt; &lt;/span&gt;&lt;span class="p"&gt;{&lt;/span&gt;&lt;span class="w"&gt;
      &lt;/span&gt;&lt;span class="nl"&gt;"version"&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt;&lt;span class="w"&gt; &lt;/span&gt;&lt;span class="s2"&gt;"detect"&lt;/span&gt;&lt;span class="w"&gt;
    &lt;/span&gt;&lt;span class="p"&gt;},&lt;/span&gt;&lt;span class="w"&gt;
    &lt;/span&gt;&lt;span class="nl"&gt;"import/resolver"&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt;&lt;span class="w"&gt; &lt;/span&gt;&lt;span class="p"&gt;{&lt;/span&gt;&lt;span class="w"&gt;
      &lt;/span&gt;&lt;span class="nl"&gt;"node"&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt;&lt;span class="w"&gt; &lt;/span&gt;&lt;span class="p"&gt;{&lt;/span&gt;&lt;span class="w"&gt;
        &lt;/span&gt;&lt;span class="nl"&gt;"paths"&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt;&lt;span class="w"&gt; &lt;/span&gt;&lt;span class="p"&gt;[&lt;/span&gt;&lt;span class="w"&gt;
          &lt;/span&gt;&lt;span class="s2"&gt;"src"&lt;/span&gt;&lt;span class="w"&gt;
        &lt;/span&gt;&lt;span class="p"&gt;],&lt;/span&gt;&lt;span class="w"&gt;
        &lt;/span&gt;&lt;span class="nl"&gt;"extensions"&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt;&lt;span class="w"&gt; &lt;/span&gt;&lt;span class="p"&gt;[&lt;/span&gt;&lt;span class="w"&gt;
          &lt;/span&gt;&lt;span class="s2"&gt;".js"&lt;/span&gt;&lt;span class="p"&gt;,&lt;/span&gt;&lt;span class="w"&gt;
          &lt;/span&gt;&lt;span class="s2"&gt;".jsx"&lt;/span&gt;&lt;span class="p"&gt;,&lt;/span&gt;&lt;span class="w"&gt;
          &lt;/span&gt;&lt;span class="s2"&gt;".ts"&lt;/span&gt;&lt;span class="p"&gt;,&lt;/span&gt;&lt;span class="w"&gt;
          &lt;/span&gt;&lt;span class="s2"&gt;".tsx"&lt;/span&gt;&lt;span class="w"&gt;
        &lt;/span&gt;&lt;span class="p"&gt;]&lt;/span&gt;&lt;span class="w"&gt;
      &lt;/span&gt;&lt;span class="p"&gt;}&lt;/span&gt;&lt;span class="w"&gt;
    &lt;/span&gt;&lt;span class="p"&gt;}&lt;/span&gt;&lt;span class="w"&gt;
  &lt;/span&gt;&lt;span class="p"&gt;},&lt;/span&gt;&lt;span class="w"&gt;
  &lt;/span&gt;&lt;span class="nl"&gt;"rules"&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt;&lt;span class="w"&gt; &lt;/span&gt;&lt;span class="p"&gt;{&lt;/span&gt;&lt;span class="w"&gt;
    &lt;/span&gt;&lt;span class="nl"&gt;"no-unused-vars"&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt;&lt;span class="w"&gt; &lt;/span&gt;&lt;span class="p"&gt;[&lt;/span&gt;&lt;span class="w"&gt;
      &lt;/span&gt;&lt;span class="s2"&gt;"error"&lt;/span&gt;&lt;span class="p"&gt;,&lt;/span&gt;&lt;span class="w"&gt;
      &lt;/span&gt;&lt;span class="p"&gt;{&lt;/span&gt;&lt;span class="w"&gt;
        &lt;/span&gt;&lt;span class="nl"&gt;"vars"&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt;&lt;span class="w"&gt; &lt;/span&gt;&lt;span class="s2"&gt;"all"&lt;/span&gt;&lt;span class="p"&gt;,&lt;/span&gt;&lt;span class="w"&gt;
        &lt;/span&gt;&lt;span class="nl"&gt;"args"&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt;&lt;span class="w"&gt; &lt;/span&gt;&lt;span class="s2"&gt;"after-used"&lt;/span&gt;&lt;span class="p"&gt;,&lt;/span&gt;&lt;span class="w"&gt;
        &lt;/span&gt;&lt;span class="nl"&gt;"ignoreRestSiblings"&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt;&lt;span class="w"&gt; &lt;/span&gt;&lt;span class="kc"&gt;true&lt;/span&gt;&lt;span class="p"&gt;,&lt;/span&gt;&lt;span class="w"&gt;
        &lt;/span&gt;&lt;span class="nl"&gt;"argsIgnorePattern"&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt;&lt;span class="w"&gt; &lt;/span&gt;&lt;span class="s2"&gt;"^_"&lt;/span&gt;&lt;span class="w"&gt;
      &lt;/span&gt;&lt;span class="p"&gt;}&lt;/span&gt;&lt;span class="w"&gt;
    &lt;/span&gt;&lt;span class="p"&gt;],&lt;/span&gt;&lt;span class="w"&gt;
    &lt;/span&gt;&lt;span class="nl"&gt;"react/react-in-jsx-scope"&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt;&lt;span class="w"&gt; &lt;/span&gt;&lt;span class="s2"&gt;"off"&lt;/span&gt;&lt;span class="w"&gt;
  &lt;/span&gt;&lt;span class="p"&gt;}&lt;/span&gt;&lt;span class="w"&gt;
&lt;/span&gt;&lt;span class="p"&gt;}&lt;/span&gt;&lt;span class="w"&gt;


&lt;/span&gt;&lt;/code&gt;&lt;/pre&gt;

&lt;/div&gt;

&lt;p&gt;With &lt;code&gt;no-unused-vars&lt;/code&gt; we will ensure that any unused variable will trigger an error. The &lt;code&gt;react/react-in-jsx-scope&lt;/code&gt; rule was disabled so ESLint won't enforce the import of React in files with JSX (&lt;code&gt;import React from 'react'&lt;/code&gt;). Since React 17.0, importing React in JSX files is not required.&lt;/p&gt;

&lt;p&gt;Now we will create the &lt;code&gt;.eslintignore&lt;/code&gt; file, which will tell ESLint which files should not be linted:&lt;/p&gt;

&lt;p&gt;&lt;code&gt;.eslintignore&lt;/code&gt;&lt;/p&gt;

&lt;div class="highlight js-code-highlight"&gt;
&lt;pre class="highlight json"&gt;&lt;code&gt;&lt;span class="w"&gt;

&lt;/span&gt;&lt;span class="err"&gt;node_modules/&lt;/span&gt;&lt;span class="w"&gt;
&lt;/span&gt;&lt;span class="err"&gt;dist/&lt;/span&gt;&lt;span class="w"&gt;
&lt;/span&gt;&lt;span class="err"&gt;env.d.ts&lt;/span&gt;&lt;span class="w"&gt;


&lt;/span&gt;&lt;/code&gt;&lt;/pre&gt;

&lt;/div&gt;

&lt;p&gt;It's recommended that you add a &lt;code&gt;lint&lt;/code&gt; script to your scripts section in your &lt;code&gt;package.json&lt;/code&gt;, so you can run ESLint by executing &lt;code&gt;yarn lint&lt;/code&gt; or &lt;code&gt;npm run lint&lt;/code&gt;:&lt;/p&gt;

&lt;div class="highlight js-code-highlight"&gt;
&lt;pre class="highlight json"&gt;&lt;code&gt;&lt;span class="w"&gt;

&lt;/span&gt;&lt;span class="nl"&gt;"scripts"&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt;&lt;span class="w"&gt; &lt;/span&gt;&lt;span class="p"&gt;{&lt;/span&gt;&lt;span class="w"&gt;
  &lt;/span&gt;&lt;span class="err"&gt;...&lt;/span&gt;&lt;span class="w"&gt;
  &lt;/span&gt;&lt;span class="nl"&gt;"lint"&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt;&lt;span class="w"&gt; &lt;/span&gt;&lt;span class="s2"&gt;"eslint . --ext .ts,.tsx"&lt;/span&gt;&lt;span class="w"&gt;
&lt;/span&gt;&lt;span class="p"&gt;}&lt;/span&gt;&lt;span class="w"&gt;


&lt;/span&gt;&lt;/code&gt;&lt;/pre&gt;

&lt;/div&gt;

&lt;p&gt;Our &lt;code&gt;lint&lt;/code&gt; script will be running &lt;code&gt;eslint&lt;/code&gt; over all &lt;code&gt;.ts&lt;/code&gt; and &lt;code&gt;.tsx&lt;/code&gt; files starting from the project's root.&lt;/p&gt;

&lt;h2&gt;
  
  
  Step 3: configuring Prettier
&lt;/h2&gt;

&lt;p&gt;Just like we did when configuring ESLint, we will now create the &lt;code&gt;.prettierrc&lt;/code&gt; file, with our Prettier settings. To learn more about the available options, check &lt;a href="https://prettier.io/docs/en/options.html" rel="noopener noreferrer"&gt;Prettier docs&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;&lt;code&gt;.prettierrc&lt;/code&gt;&lt;/p&gt;

&lt;div class="highlight js-code-highlight"&gt;
&lt;pre class="highlight json"&gt;&lt;code&gt;&lt;span class="w"&gt;

&lt;/span&gt;&lt;span class="p"&gt;{&lt;/span&gt;&lt;span class="w"&gt;
  &lt;/span&gt;&lt;span class="nl"&gt;"trailingComma"&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt;&lt;span class="w"&gt; &lt;/span&gt;&lt;span class="s2"&gt;"all"&lt;/span&gt;&lt;span class="p"&gt;,&lt;/span&gt;&lt;span class="w"&gt;
  &lt;/span&gt;&lt;span class="nl"&gt;"tabWidth"&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt;&lt;span class="w"&gt; &lt;/span&gt;&lt;span class="mi"&gt;2&lt;/span&gt;&lt;span class="p"&gt;,&lt;/span&gt;&lt;span class="w"&gt;
  &lt;/span&gt;&lt;span class="nl"&gt;"semi"&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt;&lt;span class="w"&gt; &lt;/span&gt;&lt;span class="kc"&gt;true&lt;/span&gt;&lt;span class="p"&gt;,&lt;/span&gt;&lt;span class="w"&gt;
  &lt;/span&gt;&lt;span class="nl"&gt;"singleQuote"&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt;&lt;span class="w"&gt; &lt;/span&gt;&lt;span class="kc"&gt;true&lt;/span&gt;&lt;span class="p"&gt;,&lt;/span&gt;&lt;span class="w"&gt;
  &lt;/span&gt;&lt;span class="nl"&gt;"printWidth"&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt;&lt;span class="w"&gt; &lt;/span&gt;&lt;span class="mi"&gt;120&lt;/span&gt;&lt;span class="p"&gt;,&lt;/span&gt;&lt;span class="w"&gt;
  &lt;/span&gt;&lt;span class="nl"&gt;"bracketSpacing"&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt;&lt;span class="w"&gt; &lt;/span&gt;&lt;span class="kc"&gt;true&lt;/span&gt;&lt;span class="p"&gt;,&lt;/span&gt;&lt;span class="w"&gt;
  &lt;/span&gt;&lt;span class="nl"&gt;"endOfLine"&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt;&lt;span class="w"&gt; &lt;/span&gt;&lt;span class="s2"&gt;"lf"&lt;/span&gt;&lt;span class="w"&gt;
&lt;/span&gt;&lt;span class="p"&gt;}&lt;/span&gt;&lt;span class="w"&gt;


&lt;/span&gt;&lt;/code&gt;&lt;/pre&gt;

&lt;/div&gt;

&lt;p&gt;And then, &lt;code&gt;.prettierignore&lt;/code&gt;:&lt;/p&gt;

&lt;p&gt;&lt;code&gt;.prettierignore&lt;/code&gt;&lt;/p&gt;

&lt;div class="highlight js-code-highlight"&gt;
&lt;pre class="highlight json"&gt;&lt;code&gt;&lt;span class="w"&gt;

&lt;/span&gt;&lt;span class="err"&gt;node_modules/&lt;/span&gt;&lt;span class="w"&gt;
&lt;/span&gt;&lt;span class="err"&gt;dist/&lt;/span&gt;&lt;span class="w"&gt;


&lt;/span&gt;&lt;/code&gt;&lt;/pre&gt;

&lt;/div&gt;
&lt;h2&gt;
  
  
  Step 4: integrating with VSCode
&lt;/h2&gt;

&lt;p&gt;Ultimately, we will configure VSCode to use ESLint and Prettier to find problems and format our code, respectively. If you don't have the extensions installed yet, install them: &lt;a href="https://marketplace.visualstudio.com/items?itemName=esbenp.prettier-vscode" rel="noopener noreferrer"&gt;Prettier - Code formatter&lt;/a&gt; and &lt;a href="https://marketplace.visualstudio.com/items?itemName=dbaeumer.vscode-eslint" rel="noopener noreferrer"&gt;ESLint&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;With the extensions already installed, we will have to configure VSCode to use Prettier to format our file on save. The ESLint extension should work automatically if there's a valid configuration file in (&lt;code&gt;.eslintrc&lt;/code&gt;) the current workspace.&lt;/p&gt;

&lt;p&gt;If you don't have a &lt;code&gt;.vscode/settings.json&lt;/code&gt; file yet, create it with the following settings:&lt;/p&gt;
&lt;div class="highlight js-code-highlight"&gt;
&lt;pre class="highlight json"&gt;&lt;code&gt;&lt;span class="w"&gt;

&lt;/span&gt;&lt;span class="p"&gt;{&lt;/span&gt;&lt;span class="w"&gt;
  &lt;/span&gt;&lt;span class="err"&gt;...&lt;/span&gt;&lt;span class="w"&gt;
  &lt;/span&gt;&lt;span class="nl"&gt;"editor.formatOnSave"&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt;&lt;span class="w"&gt; &lt;/span&gt;&lt;span class="kc"&gt;true&lt;/span&gt;&lt;span class="p"&gt;,&lt;/span&gt;&lt;span class="w"&gt;
  &lt;/span&gt;&lt;span class="nl"&gt;"editor.defaultFormatter"&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt;&lt;span class="w"&gt; &lt;/span&gt;&lt;span class="s2"&gt;"esbenp.prettier-vscode"&lt;/span&gt;&lt;span class="w"&gt;
&lt;/span&gt;&lt;span class="p"&gt;}&lt;/span&gt;&lt;span class="w"&gt;


&lt;/span&gt;&lt;/code&gt;&lt;/pre&gt;

&lt;/div&gt;

&lt;p&gt;Well done! Now ESLint should highlight code problems while editing and Prettier should apply formatting on save when it's possible.&lt;/p&gt;

&lt;p&gt;&lt;a href="https://media.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2Fsguy7hw5qf62vxhppzm6.gif" class="article-body-image-wrapper"&gt;&lt;img src="https://media.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2Fsguy7hw5qf62vxhppzm6.gif" alt="ESLint and Prettier on VSCode"&gt;&lt;/a&gt;&lt;/p&gt;

&lt;h2&gt;
  
  
  Final thoughts
&lt;/h2&gt;

&lt;p&gt;This post was inspired by &lt;a href="https://cathalmacdonnacha.com/setting-up-eslint-prettier-in-vitejs" rel="noopener noreferrer"&gt;Setting up ESLint &amp;amp; Prettier in ViteJS&lt;br&gt;
&lt;/a&gt; by Cathal Mac Donnacha.&lt;/p&gt;

&lt;p&gt;A repository with this configuration, including Storybook, Jest and React Testing Library is available at my GitHub: &lt;a href="https://github.com/marcosdiasdev/react-vitejs-template" rel="noopener noreferrer"&gt;https://github.com/marcosdiasdev/react-vitejs-template&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;Let's talk!&lt;/p&gt;

</description>
      <category>react</category>
      <category>vitejs</category>
      <category>eslint</category>
      <category>prettier</category>
    </item>
    <item>
      <title>Adicionando ESLint e Prettier a um projeto React criado com ViteJS</title>
      <dc:creator>Marcos Dias</dc:creator>
      <pubDate>Mon, 09 Jan 2023 01:03:14 +0000</pubDate>
      <link>https://dev.to/marcosdiasdev/adicionando-eslint-e-prettier-a-um-projeto-react-criado-com-vitejs-hgn</link>
      <guid>https://dev.to/marcosdiasdev/adicionando-eslint-e-prettier-a-um-projeto-react-criado-com-vitejs-hgn</guid>
      <description>&lt;p&gt;Recentemente, eu resolvi experimentar o &lt;a href="https://vitejs.dev/guide/why.html" rel="noopener noreferrer"&gt;ViteJS&lt;/a&gt; como alternativa ao Create React App. Embora o ViteJS já ofereça uma estrutura básica para um projeto React, o template recomendado na documentação não vem configurado com ESLint e Prettier.&lt;/p&gt;

&lt;p&gt;Neste artigo, vamos passar brevemente pela instalação e configuração dessas duas ferramentas em um projeto React criado com ViteJS.&lt;/p&gt;

&lt;h2&gt;
  
  
  Passo 1: instalar as dependências
&lt;/h2&gt;

&lt;p&gt;Além do ESLint e do Prettier, vamos instalar as seguintes dependências:&lt;/p&gt;

&lt;ul&gt;
&lt;li&gt;
&lt;code&gt;@typescript-eslint/eslint-plugin&lt;/code&gt;: plugin com regras para projetos com código TypeScript.&lt;/li&gt;
&lt;li&gt;
&lt;code&gt;@typescript-eslint/parser&lt;/code&gt;: um parser que permitirá ao ESLint fazer sugestões em código TypeScript.&lt;/li&gt;
&lt;li&gt;
&lt;code&gt;eslint-config-prettier&lt;/code&gt;: uma configuração para o ESLint que desabilita regras que serão gerenciadas pelo Prettier, evitando conflitos.&lt;/li&gt;
&lt;li&gt;
&lt;code&gt;eslint-plugin-import&lt;/code&gt;: plugin que permitirá ao ESLint lidar com a sintaxe de &lt;code&gt;import&lt;/code&gt;/&lt;code&gt;export&lt;/code&gt; da ES6+.&lt;/li&gt;
&lt;li&gt;
&lt;code&gt;eslint-plugin-jsx-a11y&lt;/code&gt;: plugin com regras de acessibilidade.&lt;/li&gt;
&lt;li&gt;
&lt;code&gt;eslint-plugin-react&lt;/code&gt;: plugin com regras específicas para projetos React.&lt;/li&gt;
&lt;li&gt;
&lt;code&gt;eslint-plugin-react-hooks&lt;/code&gt;: plugin com regras sobre o uso de React hooks. Ele garantirá, por exemplo, que você jamais utilize um hook fora de um function component.&lt;/li&gt;
&lt;/ul&gt;

&lt;p&gt;Para instalar todas as dependências, execute a seguinte linha:&lt;/p&gt;

&lt;div class="highlight js-code-highlight"&gt;
&lt;pre class="highlight shell"&gt;&lt;code&gt;

yarn add &lt;span class="nt"&gt;-D&lt;/span&gt; eslint prettier @typescript-eslint/eslint-plugin @typescript-eslint/parser eslint-config-prettier eslint-plugin-import eslint-plugin-jsx-a11y eslint-plugin-react eslint-plugin-react-hooks


&lt;/code&gt;&lt;/pre&gt;

&lt;/div&gt;

&lt;p&gt;Se você utilizar &lt;code&gt;npm&lt;/code&gt; como gerenciador de pacotes, substitua &lt;code&gt;yarn add -D&lt;/code&gt; por &lt;code&gt;npm install --dev&lt;/code&gt;.&lt;/p&gt;

&lt;h2&gt;
  
  
  Passo 2: configurar o ESLint
&lt;/h2&gt;

&lt;p&gt;Com as dependências corretamente instaladas, é hora de criar os arquivos de configuração do ESLint. Primeiro, criaremos o arquivo &lt;code&gt;.eslintrc&lt;/code&gt; que manterá as configurações para o ESLint em nosso projeto.&lt;/p&gt;

&lt;blockquote&gt;
&lt;p&gt;Todos os arquivos de configuração do ESLint e do Prettier deverão ser criados na raíz do projeto.&lt;/p&gt;
&lt;/blockquote&gt;

&lt;p&gt;&lt;code&gt;.eslintrc&lt;/code&gt;&lt;/p&gt;

&lt;div class="highlight js-code-highlight"&gt;
&lt;pre class="highlight json"&gt;&lt;code&gt;&lt;span class="w"&gt;

&lt;/span&gt;&lt;span class="p"&gt;{&lt;/span&gt;&lt;span class="w"&gt;
  &lt;/span&gt;&lt;span class="nl"&gt;"extends"&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt;&lt;span class="w"&gt; &lt;/span&gt;&lt;span class="p"&gt;[&lt;/span&gt;&lt;span class="w"&gt;
    &lt;/span&gt;&lt;span class="s2"&gt;"eslint:recommended"&lt;/span&gt;&lt;span class="p"&gt;,&lt;/span&gt;&lt;span class="w"&gt;
    &lt;/span&gt;&lt;span class="s2"&gt;"plugin:react/recommended"&lt;/span&gt;&lt;span class="p"&gt;,&lt;/span&gt;&lt;span class="w"&gt;
    &lt;/span&gt;&lt;span class="s2"&gt;"plugin:react-hooks/recommended"&lt;/span&gt;&lt;span class="p"&gt;,&lt;/span&gt;&lt;span class="w"&gt;
    &lt;/span&gt;&lt;span class="s2"&gt;"plugin:import/recommended"&lt;/span&gt;&lt;span class="p"&gt;,&lt;/span&gt;&lt;span class="w"&gt;
    &lt;/span&gt;&lt;span class="s2"&gt;"plugin:jsx-a11y/recommended"&lt;/span&gt;&lt;span class="p"&gt;,&lt;/span&gt;&lt;span class="w"&gt;
    &lt;/span&gt;&lt;span class="s2"&gt;"plugin:@typescript-eslint/recommended"&lt;/span&gt;&lt;span class="p"&gt;,&lt;/span&gt;&lt;span class="w"&gt;
    &lt;/span&gt;&lt;span class="s2"&gt;"eslint-config-prettier"&lt;/span&gt;&lt;span class="w"&gt;
  &lt;/span&gt;&lt;span class="p"&gt;],&lt;/span&gt;&lt;span class="w"&gt;
  &lt;/span&gt;&lt;span class="nl"&gt;"settings"&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt;&lt;span class="w"&gt; &lt;/span&gt;&lt;span class="p"&gt;{&lt;/span&gt;&lt;span class="w"&gt;
    &lt;/span&gt;&lt;span class="nl"&gt;"react"&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt;&lt;span class="w"&gt; &lt;/span&gt;&lt;span class="p"&gt;{&lt;/span&gt;&lt;span class="w"&gt;
      &lt;/span&gt;&lt;span class="nl"&gt;"version"&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt;&lt;span class="w"&gt; &lt;/span&gt;&lt;span class="s2"&gt;"detect"&lt;/span&gt;&lt;span class="w"&gt;
    &lt;/span&gt;&lt;span class="p"&gt;},&lt;/span&gt;&lt;span class="w"&gt;
    &lt;/span&gt;&lt;span class="nl"&gt;"import/resolver"&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt;&lt;span class="w"&gt; &lt;/span&gt;&lt;span class="p"&gt;{&lt;/span&gt;&lt;span class="w"&gt;
      &lt;/span&gt;&lt;span class="nl"&gt;"node"&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt;&lt;span class="w"&gt; &lt;/span&gt;&lt;span class="p"&gt;{&lt;/span&gt;&lt;span class="w"&gt;
        &lt;/span&gt;&lt;span class="nl"&gt;"paths"&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt;&lt;span class="w"&gt; &lt;/span&gt;&lt;span class="p"&gt;[&lt;/span&gt;&lt;span class="w"&gt;
          &lt;/span&gt;&lt;span class="s2"&gt;"src"&lt;/span&gt;&lt;span class="w"&gt;
        &lt;/span&gt;&lt;span class="p"&gt;],&lt;/span&gt;&lt;span class="w"&gt;
        &lt;/span&gt;&lt;span class="nl"&gt;"extensions"&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt;&lt;span class="w"&gt; &lt;/span&gt;&lt;span class="p"&gt;[&lt;/span&gt;&lt;span class="w"&gt;
          &lt;/span&gt;&lt;span class="s2"&gt;".js"&lt;/span&gt;&lt;span class="p"&gt;,&lt;/span&gt;&lt;span class="w"&gt;
          &lt;/span&gt;&lt;span class="s2"&gt;".jsx"&lt;/span&gt;&lt;span class="p"&gt;,&lt;/span&gt;&lt;span class="w"&gt;
          &lt;/span&gt;&lt;span class="s2"&gt;".ts"&lt;/span&gt;&lt;span class="p"&gt;,&lt;/span&gt;&lt;span class="w"&gt;
          &lt;/span&gt;&lt;span class="s2"&gt;".tsx"&lt;/span&gt;&lt;span class="w"&gt;
        &lt;/span&gt;&lt;span class="p"&gt;]&lt;/span&gt;&lt;span class="w"&gt;
      &lt;/span&gt;&lt;span class="p"&gt;}&lt;/span&gt;&lt;span class="w"&gt;
    &lt;/span&gt;&lt;span class="p"&gt;}&lt;/span&gt;&lt;span class="w"&gt;
  &lt;/span&gt;&lt;span class="p"&gt;},&lt;/span&gt;&lt;span class="w"&gt;
  &lt;/span&gt;&lt;span class="nl"&gt;"rules"&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt;&lt;span class="w"&gt; &lt;/span&gt;&lt;span class="p"&gt;{&lt;/span&gt;&lt;span class="w"&gt;
    &lt;/span&gt;&lt;span class="nl"&gt;"no-unused-vars"&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt;&lt;span class="w"&gt; &lt;/span&gt;&lt;span class="p"&gt;[&lt;/span&gt;&lt;span class="w"&gt;
      &lt;/span&gt;&lt;span class="s2"&gt;"error"&lt;/span&gt;&lt;span class="p"&gt;,&lt;/span&gt;&lt;span class="w"&gt;
      &lt;/span&gt;&lt;span class="p"&gt;{&lt;/span&gt;&lt;span class="w"&gt;
        &lt;/span&gt;&lt;span class="nl"&gt;"vars"&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt;&lt;span class="w"&gt; &lt;/span&gt;&lt;span class="s2"&gt;"all"&lt;/span&gt;&lt;span class="p"&gt;,&lt;/span&gt;&lt;span class="w"&gt;
        &lt;/span&gt;&lt;span class="nl"&gt;"args"&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt;&lt;span class="w"&gt; &lt;/span&gt;&lt;span class="s2"&gt;"after-used"&lt;/span&gt;&lt;span class="p"&gt;,&lt;/span&gt;&lt;span class="w"&gt;
        &lt;/span&gt;&lt;span class="nl"&gt;"ignoreRestSiblings"&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt;&lt;span class="w"&gt; &lt;/span&gt;&lt;span class="kc"&gt;true&lt;/span&gt;&lt;span class="p"&gt;,&lt;/span&gt;&lt;span class="w"&gt;
        &lt;/span&gt;&lt;span class="nl"&gt;"argsIgnorePattern"&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt;&lt;span class="w"&gt; &lt;/span&gt;&lt;span class="s2"&gt;"^_"&lt;/span&gt;&lt;span class="w"&gt;
      &lt;/span&gt;&lt;span class="p"&gt;}&lt;/span&gt;&lt;span class="w"&gt;
    &lt;/span&gt;&lt;span class="p"&gt;],&lt;/span&gt;&lt;span class="w"&gt;
    &lt;/span&gt;&lt;span class="nl"&gt;"react/react-in-jsx-scope"&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt;&lt;span class="w"&gt; &lt;/span&gt;&lt;span class="s2"&gt;"off"&lt;/span&gt;&lt;span class="w"&gt;
  &lt;/span&gt;&lt;span class="p"&gt;}&lt;/span&gt;&lt;span class="w"&gt;
&lt;/span&gt;&lt;span class="p"&gt;}&lt;/span&gt;&lt;span class="w"&gt;


&lt;/span&gt;&lt;/code&gt;&lt;/pre&gt;

&lt;/div&gt;

&lt;p&gt;Com a regra &lt;code&gt;no-unused-vars&lt;/code&gt; garantiremos que um erro será emitido caso nos esqueçamos de alguma variável não utilizada em nosso código. A regra &lt;code&gt;react/react-in-jsx-scope&lt;/code&gt; foi desabilitada para que o ESLint não marque como obrigatória a importação do React (&lt;code&gt;import React from 'react'&lt;/code&gt;) em arquivos que utilizem JSX, já que isso não é mais necessário nas versões mais recentes do React.&lt;/p&gt;

&lt;p&gt;Em seguida, criaremos um arquivo &lt;code&gt;.eslintignore&lt;/code&gt;, que deverá indicar ao ESLint quais arquivos serão ignorados:&lt;/p&gt;

&lt;p&gt;&lt;code&gt;.eslintignore&lt;/code&gt;&lt;/p&gt;

&lt;div class="highlight js-code-highlight"&gt;
&lt;pre class="highlight json"&gt;&lt;code&gt;&lt;span class="w"&gt;

&lt;/span&gt;&lt;span class="err"&gt;node_modules/&lt;/span&gt;&lt;span class="w"&gt;
&lt;/span&gt;&lt;span class="err"&gt;dist/&lt;/span&gt;&lt;span class="w"&gt;
&lt;/span&gt;&lt;span class="err"&gt;env.d.ts&lt;/span&gt;&lt;span class="w"&gt;


&lt;/span&gt;&lt;/code&gt;&lt;/pre&gt;

&lt;/div&gt;

&lt;p&gt;Se preferir, adicione também à seção &lt;code&gt;scripts&lt;/code&gt; do seu &lt;code&gt;package.json&lt;/code&gt; um script para executar o ESLint no seu projeto:&lt;/p&gt;

&lt;div class="highlight js-code-highlight"&gt;
&lt;pre class="highlight json"&gt;&lt;code&gt;&lt;span class="w"&gt;

&lt;/span&gt;&lt;span class="nl"&gt;"scripts"&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt;&lt;span class="w"&gt; &lt;/span&gt;&lt;span class="p"&gt;{&lt;/span&gt;&lt;span class="w"&gt;
  &lt;/span&gt;&lt;span class="err"&gt;...&lt;/span&gt;&lt;span class="w"&gt;
  &lt;/span&gt;&lt;span class="nl"&gt;"lint"&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt;&lt;span class="w"&gt; &lt;/span&gt;&lt;span class="s2"&gt;"eslint . --ext .ts,.tsx"&lt;/span&gt;&lt;span class="w"&gt;
&lt;/span&gt;&lt;span class="p"&gt;}&lt;/span&gt;&lt;span class="w"&gt;


&lt;/span&gt;&lt;/code&gt;&lt;/pre&gt;

&lt;/div&gt;
&lt;h2&gt;
  
  
  Passo 3: configurar o Prettier
&lt;/h2&gt;

&lt;p&gt;Assim como fizemos com o ESLint, agora criaremos um arquivo &lt;code&gt;.prettierrc&lt;/code&gt; com as configurações que utilizaremos no Prettier. Para aprender mais sobre as opções utilizadas e outras disponíveis, acesse a &lt;a href="https://prettier.io/docs/en/options.html" rel="noopener noreferrer"&gt;documentação do Prettier&lt;/a&gt;:&lt;/p&gt;

&lt;p&gt;&lt;code&gt;.prettierrc&lt;/code&gt;&lt;/p&gt;
&lt;div class="highlight js-code-highlight"&gt;
&lt;pre class="highlight json"&gt;&lt;code&gt;&lt;span class="w"&gt;

&lt;/span&gt;&lt;span class="p"&gt;{&lt;/span&gt;&lt;span class="w"&gt;
  &lt;/span&gt;&lt;span class="nl"&gt;"trailingComma"&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt;&lt;span class="w"&gt; &lt;/span&gt;&lt;span class="s2"&gt;"all"&lt;/span&gt;&lt;span class="p"&gt;,&lt;/span&gt;&lt;span class="w"&gt;
  &lt;/span&gt;&lt;span class="nl"&gt;"tabWidth"&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt;&lt;span class="w"&gt; &lt;/span&gt;&lt;span class="mi"&gt;2&lt;/span&gt;&lt;span class="p"&gt;,&lt;/span&gt;&lt;span class="w"&gt;
  &lt;/span&gt;&lt;span class="nl"&gt;"semi"&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt;&lt;span class="w"&gt; &lt;/span&gt;&lt;span class="kc"&gt;true&lt;/span&gt;&lt;span class="p"&gt;,&lt;/span&gt;&lt;span class="w"&gt;
  &lt;/span&gt;&lt;span class="nl"&gt;"singleQuote"&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt;&lt;span class="w"&gt; &lt;/span&gt;&lt;span class="kc"&gt;true&lt;/span&gt;&lt;span class="p"&gt;,&lt;/span&gt;&lt;span class="w"&gt;
  &lt;/span&gt;&lt;span class="nl"&gt;"printWidth"&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt;&lt;span class="w"&gt; &lt;/span&gt;&lt;span class="mi"&gt;120&lt;/span&gt;&lt;span class="p"&gt;,&lt;/span&gt;&lt;span class="w"&gt;
  &lt;/span&gt;&lt;span class="nl"&gt;"bracketSpacing"&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt;&lt;span class="w"&gt; &lt;/span&gt;&lt;span class="kc"&gt;true&lt;/span&gt;&lt;span class="p"&gt;,&lt;/span&gt;&lt;span class="w"&gt;
  &lt;/span&gt;&lt;span class="nl"&gt;"endOfLine"&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt;&lt;span class="w"&gt; &lt;/span&gt;&lt;span class="s2"&gt;"lf"&lt;/span&gt;&lt;span class="w"&gt;
&lt;/span&gt;&lt;span class="p"&gt;}&lt;/span&gt;&lt;span class="w"&gt;


&lt;/span&gt;&lt;/code&gt;&lt;/pre&gt;

&lt;/div&gt;

&lt;p&gt;Para determinar os arquivos ignorados pelo Prettier, crie um arquivo &lt;code&gt;.prettierignore&lt;/code&gt;, como a seguir:&lt;/p&gt;

&lt;p&gt;&lt;code&gt;.prettierignore&lt;/code&gt;&lt;/p&gt;

&lt;div class="highlight js-code-highlight"&gt;
&lt;pre class="highlight json"&gt;&lt;code&gt;&lt;span class="w"&gt;

&lt;/span&gt;&lt;span class="err"&gt;node_modules/&lt;/span&gt;&lt;span class="w"&gt;
&lt;/span&gt;&lt;span class="err"&gt;dist/&lt;/span&gt;&lt;span class="w"&gt;


&lt;/span&gt;&lt;/code&gt;&lt;/pre&gt;

&lt;/div&gt;
&lt;h2&gt;
  
  
  Passo 4: integrando com o VSCode
&lt;/h2&gt;

&lt;p&gt;Por fim, iremos configurar o VSCode para utilizar o ESLint e o Prettier para fazer sugestões e formatar o código, respectivamente. Caso você ainda não as possua, instale as extensões &lt;a href="https://marketplace.visualstudio.com/items?itemName=esbenp.prettier-vscode" rel="noopener noreferrer"&gt;Prettier - Code formatter&lt;/a&gt; e &lt;a href="https://marketplace.visualstudio.com/items?itemName=dbaeumer.vscode-eslint" rel="noopener noreferrer"&gt;ESLint&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;Com as extensões instaladas, também será necessário configurar o VSCode para utilizar o Prettier para formatação do documento no momento em que ele for salvo. A extensão ESLint deverá entrar em ação automaticamente caso haja um arquivo de configuração válido, como o &lt;code&gt;.eslintrc&lt;/code&gt; que criamos.&lt;/p&gt;

&lt;p&gt;Caso seu projeto ainda não possua um arquivo &lt;code&gt;.vscode/settings.json&lt;/code&gt;, será necessário criá-lo. Nesse arquivo, adicione as duas regras a seguir:&lt;/p&gt;
&lt;div class="highlight js-code-highlight"&gt;
&lt;pre class="highlight json"&gt;&lt;code&gt;&lt;span class="w"&gt;

&lt;/span&gt;&lt;span class="p"&gt;{&lt;/span&gt;&lt;span class="w"&gt;
  &lt;/span&gt;&lt;span class="err"&gt;...&lt;/span&gt;&lt;span class="w"&gt;
  &lt;/span&gt;&lt;span class="nl"&gt;"editor.formatOnSave"&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt;&lt;span class="w"&gt; &lt;/span&gt;&lt;span class="kc"&gt;true&lt;/span&gt;&lt;span class="p"&gt;,&lt;/span&gt;&lt;span class="w"&gt;
  &lt;/span&gt;&lt;span class="nl"&gt;"editor.defaultFormatter"&lt;/span&gt;&lt;span class="p"&gt;:&lt;/span&gt;&lt;span class="w"&gt; &lt;/span&gt;&lt;span class="s2"&gt;"esbenp.prettier-vscode"&lt;/span&gt;&lt;span class="w"&gt;
&lt;/span&gt;&lt;span class="p"&gt;}&lt;/span&gt;&lt;span class="w"&gt;


&lt;/span&gt;&lt;/code&gt;&lt;/pre&gt;

&lt;/div&gt;

&lt;p&gt;Pronto! Com isso, o ESLint deverá destacar os trechos problemáticos do seu código e o Prettier deverá formatar e aplicar correções sempre que possível ao salvar o documento.&lt;/p&gt;

&lt;p&gt;&lt;a href="https://media.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2Fsguy7hw5qf62vxhppzm6.gif" class="article-body-image-wrapper"&gt;&lt;img src="https://media.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2Fsguy7hw5qf62vxhppzm6.gif" alt="ESLint and Prettier on VSCode"&gt;&lt;/a&gt;&lt;/p&gt;

&lt;h2&gt;
  
  
  Considerações finais
&lt;/h2&gt;

&lt;p&gt;Este artigo foi inspirado pelo artigo &lt;a href="https://cathalmacdonnacha.com/setting-up-eslint-prettier-in-vitejs" rel="noopener noreferrer"&gt;Setting up ESLint &amp;amp; Prettier in ViteJS&lt;br&gt;
&lt;/a&gt; e traz alguns ajustes e adições. &lt;/p&gt;

&lt;p&gt;Um repositório com o projeto completo, incluindo Storybook, está disponível em &lt;a href="https://github.com/marcosdiasdev/react-vitejs-template" rel="noopener noreferrer"&gt;https://github.com/marcosdiasdev/react-vitejs-template&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;Ficou com alguma dúvida? Vamos conversar.&lt;/p&gt;

</description>
      <category>react</category>
      <category>vitejs</category>
      <category>eslint</category>
      <category>prettier</category>
    </item>
  </channel>
</rss>
