.eslintrc.json

{
  "env": {
    "browser": true,
    "es2021": true,
    "node": true,
    "jest/globals": true
  },
  "extends": [
    "eslint:recommended",
    "plugin:react/recommended",
    "plugin:jest/recommended"
  ],
  "parser": "@babel/eslint-parser",
  "parserOptions": {
    "ecmaFeatures": {
      "jsx": true
    },
    "ecmaVersion": 2018,
    "sourceType": "module"
  },
  "plugins": ["react", "jest"],
  "ignorePatterns": ["/*.*"],
  "rules": {
    "indent": "off",
    "react/jsx-uses-react": 1,
    "react/jsx-uses-vars": 1,
    "react/react-in-jsx-scope": 0,
    "react/display-name": 0,
    "linebreak-style": ["error", "unix"],
    "quotes": ["error", "double", { "allowTemplateLiterals": true }],
    "semi": ["error", "always"],
    "curly": ["error"],
    "space-before-function-paren": [
      "error",
      {
        "anonymous": "never",
        "named": "never",
        "asyncArrow": "always"
      }
    ],
    "one-var": ["error", { "var": "always", "let": "never", "const": "never" }],
    "sort-keys": [
      "warn",
      "asc",
      { "caseSensitive": true, "natural": false, "minKeys": 2 }
    ],
    "eqeqeq": ["error", "smart"],
    "complexity": ["warn", { "max": 2 }],
    "no-magic-numbers": [
      "error",
      { "ignore": [-1, 0, 1], "ignoreArrayIndexes": true }
    ],
    "no-param-reassign": ["error", { "props": false }],
    "no-unused-vars": [
      "error",
      {
        "args": "after-used",
        "argsIgnorePattern": "^_",
        "varsIgnorePattern": "^_"
      }
    ]
  },
  "settings": {
    "react": {
      "createClass": "createReactClass",
      "pragma": "React",
      "fragment": "Fragment",
      "version": "16.14.0"
    }
  }
}