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https://github.com/foxkit-js/eslint-config-foxkit-react

ESlint 9 compatible Configurations for React and Preact
https://github.com/foxkit-js/eslint-config-foxkit-react

eslint eslint-config preact react

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ESlint 9 compatible Configurations for React and Preact

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README 

        
# eslint-config-foxkit-react



This package contains opinionated base configs for React/Preact development with ESLint.



See also [eslint-config-foxkit](https://github.com/foxkit-js/eslint-config-foxkit) for our JavaScript/TypeScript base configs.



## Installation



Install with your package manager of choice:



```bash

pnpm add --save-dev eslint-config-foxkit-react [email protected] react

```



**Note**: You can also install ESlint v9, but this version may not yet be supported by other Foxkit configs.



## Usage with Flat Configuration System



Add a [Flat Config] in your project like this:



```js

import foxkitReact from "eslint-config-foxkit-react/configs/index.js";



export default [foxkitReact.jsx, foxkitReact.react];

```



You may also add other configs on top, such as [prettier], as well as your own overrides.



### Usage in CommonJS projects



If your project does not set `"type": "module"` in package.json your config will be CommonJS instead (unless explicitly named "eslint.config.mjs"). If this is the case use `require("eslint-config-foxkit/configs")` instead.



```js

const foxkitReact = require("eslint-config-foxkit-react/configs");



module.exports = [foxkitReact.jsx, foxkitReact.react];

```



### Usage with Preact



The base configuration is also available for [Preact], adding a few more rules to ensure compatibilty:



```js

import foxkitReact from "eslint-config-foxkit-react/configs/index.js";



export default [foxkitReact.jsx, foxkitReact.preact];

```



### Usage with other base configurations



Alternatively you can access the rulesets by importing from `eslint-config-foxkit-react/rules`. If you are already using a base config like from your project's framework you may want to add a customized config object with our rules as well as the required plugins like this:



```js

const reactPlugin = require("eslint-plugin-react");

const globals = require("globals");

const reactRules = require("../rules/react");



export default [

  // your other base configs here,

  {

    plugins: { react: reactPlugin },

    rules: { ...reactRules },

    settings: {

      react: { version: "detect" }

    }

  }

  // more configs here as needed

];

```



**Note**: This does not yet configure `eslint-plugin-jsx-a11y` and `eslint-plugin-react-hooks` which are included in our base configuration!



### Usage with new JSX Runtime



If your project uses the new JSX transform from React 17 or a framework that similarly does no longer require `React` to be imported at the top of each file you need to include the `"jsx-runtime"` config of the [eslint-plugin-react] plugin like this:



```js

import reactPlugin from "eslint-plugin-react";

import foxkitReact from "eslint-config-foxkit-react/configs/index.js";



export default [

  foxkitReact.jsx,

  foxkitReact.react,

  reactPlugin.configs["jsx-runtime"]

];

```



## Usage with the Legacy Configuration System



Simply add `"foxkit-react"` (or `"foxkit-react/preact"` if you are using Preact) to your extends array in your `.eslintrc.cjs` file:



```js

module.exports = {

  extends: ["foxkit-react"]

};

```



**Note**: Should you need to add a file extension you will need to adjust jsx override and `"react/jsx-filename-extension"` rule:



```js

const foxkitReactOverrides = require("eslint-config-foxkit-react/legacy/overrides");

const foxkitJSX = foxkitReactOverrides.jsx;

foxkitJSX.files.push("**/*.astro"); // example adding .astro files



module.exports = {

  extends: ["foxkit-react"],

  overrides: [foxkitJSX], // re-insert patched version of the override

  rules: {

    "react/jsx-filename-extension": [

      "error",

      { extensions: [".jsx", ".tsx", ".astro"] }

    ]

  }

};

```



## Note for VSCode



As of right now the [ESLint plugin available for VSCode](https://marketplace.visualstudio.com/items?itemName=dbaeumer.vscode-eslint) has experimental support for [Flat Config] hidden behind a setting. In your project simply create a `.vscode` directory with a `settings.json` file with the following content (or add to it if you already have one):



```json

{

  "eslint.experimental.useFlatConfig": true

}

```



This enables the setting on a workspace-level, so when switching between projects the setting remains disabled for projects using the old config system. Also note that the `.mjs` and `.cjs` extensions may not get picked up correctly, so your config file should always be called `eslint.config.js`.



[Preact]: https://preactjs.com/

[eslint-plugin-react]: https://github.com/jsx-eslint/eslint-plugin-react

[Flat Config]: (https://eslint.org/docs/latest/use/configure/configuration-files-new)

[prettier]: (https://www.npmjs.com/package/eslint-config-prettier)