ESLint with React gives `no-unused-vars` errors

First, install the following module npm install --save-dev eslint-plugin-react.

Then, in your .eslintrc.json, under extends, include the following plugin:

'extends': [
    'plugin:react/recommended'
]

Source

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" 
}

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