I've setup eslint & eslint-plugin-react.
When I run ESLint, the linter returns no-unused-vars errors for each React component.
I'm assuming it's not recognizing that I'm using JSX or React syntax. Any ideas?
Example:
app.js
import React, { Component } from 'react';
import Header from './header.js';
export default class App extends Component {
render() {
return (
<div>
<Header />
{this.props.children}
</div>
);
}
}
Linter Errors:
/my_project/src/components/app.js
1:8 error 'React' is defined but never used no-unused-vars
2:8 error 'Header' is defined but never used no-unused-vars
Here is my .eslintrc.json file:
{
"env": {
"browser": true,
"es6": true
},
"extends": "eslint:recommended",
"parserOptions": {
"ecmaFeatures": {
"experimentalObjectRestSpread": true,
"jsx": true
},
"sourceType": "module"
},
"plugins": [
"react"
],
"rules": {
"react/jsx-filename-extension": [1, { "extensions": [".js", ".jsx"] }],
"indent": [
"error",
2
],
"linebreak-style": [
"error",
"unix"
],
"quotes": [
"error",
"single"
],
"semi": [
"error",
"always"
]
}
}
To solve this only problem without adding new rules from react/recommended install eslint-plugin-react:
npm install eslint-plugin-react --save-dev
add in .eslintrc.js:
"plugins": ["react"]
and:
"rules": {
"react/jsx-uses-react": "error",
"react/jsx-uses-vars": "error"
}
Since I found this while googling, you should know that this simple rule is enough to prevent this message:
react/jsx-uses-react
The react/recommended set of rules adds many other rules you may not want.