Setup eslint on React App

1. Install eslint as devDependency
2. Install eslint-plugin-react as devDependency. This provides react specific rules. More here: https://github.com/yannickcr/eslint-plugin-react
3. Install babel-eslint as devDependency. This allows eslint to parse experimental ECMAScript features that are most likely used by react.

The result should look like this

module.exports = {
  env: {
    browser: true,
    es6: true,
    node: true,
  },
  extends: ['eslint:recommended', 'plugin:react/recommended'],
  globals: {
    Atomics: 'readonly',
    SharedArrayBuffer: 'readonly',
  },
  parser: 'babel-eslint',
  parserOptions: {
    ecmaFeatures: {
      jsx: true,
    },
    ecmaVersion: 2018,
    sourceType: 'module',
  },
  plugins: ['react'],
  rules: {},
};