.eslintrc.json

{
  "parser": "babel-eslint",
  "env": {
    "browser": true,
    "es6": true
  },
  "extends": [
    "eslint:recommended",
    "plugin:react/recommended"
  ],
  "globals": {
    "Atomics": "readonly",
    "SharedArrayBuffer": "readonly"
  },
  "parserOptions": {
    "ecmaFeatures": {
      "jsx": true
    },
    "ecmaVersion": 2018,
    "sourceType": "module"
  },
  "plugins": [
    "react"
  ],
  "rules": {
    "indent": [
      "error",
      2,
      {
        "SwitchCase": 1
      }
    ],
    "comma-dangle": 0, // disallow trailing commas in object literals
    "semi": [
      1,
      "never"
    ],
    "react/jsx-filename-extension": [
      1,
      {
        "extensions": [
          ".js",
          ".jsx"
        ]
      }
    ],
    "no-trailing-spaces": 1 // disallow trailing whitespace at the end of lines
  }
}