.eslintrc.json

{
  "extends": [
    "plugin:prettier/recommended",
    "eslint:recommended"
  ],
  "plugins": ["prettier"],
  "env": {
    "browser": true,
    "node": true,
    "jest": true
  },
  "parserOptions": {
    "ecmaVersion": 9,
    "sourceType": "module",
    "ecmaFeatures": {
      "jsx": true
    }
  },
  "settings": {
    "import/resolver": {
      "webpack": {
        "config": "webpack.config.js"
      }
    }
  },
  "rules": {
    "prettier/prettier": "warn",
    "eqeqeq": "error",
    "prefer-const": "error",
    "curly": "error",
    "no-console": ["warn", { "allow": ["warn", "error"] }],
    "no-constructor-return": "error",
    "no-dupe-else-if": "warn",
    "default-param-last": "warn",
    "consistent-return": "warn",
    "class-methods-use-this": "warn",
    "no-eval": "error",
    "no-implicit-coercion": "error",
    "no-implicit-globals": "warn",
    "no-lone-blocks": "error",
    "camelcase": "warn",
    "no-useless-return": "error",
    "sort-keys": "warn",
    "sort-imports": ["warn", { "ignoreDeclarationSort": true }],
    "no-var": "error",
    "object-shorthand": "error",
    "prefer-destructuring": ["error", { "object": true, "array": false }],
    "prefer-rest-params": "error",
    "prefer-spread": "error",
    "prefer-arrow-callback": "error",
    "no-mixed-operators": "error",
    "no-plusplus": "error",
    "require-await": "error",
    "func-style": ["error", "expression"],
    "no-else-return": "warn"
  }
}