.eslintrc.js

module.exports = {
    parserOptions: {
      ecmaVersion: 8,
      sourceType: "module",
      ecmaFeatures: {
        jsx: true
      }
    },
    parser: "babel-eslint",
    plugins: ["babel", "react"],
    extends: "eslint:recommended",
    env: {
      es6: true,
      browser: true,
      commonjs: true
    },
    globals: {
      process: true,
      describe: true,
      it: true,
      __dirname: true,
      expect: true,
      jest: true,
      beforeAll: true,
      afterEach: true
    },
    rules: {
      "object-shorthand": "error",
      "generator-star-spacing": ["error", "after"],
      camelcase: ["off", { properties: "always" }],
      eqeqeq: ["error", "smart"],
      "linebreak-style": ["error", "unix"],
      "new-cap": "off",
      "no-array-constructor": "error",
      "no-lonely-if": "error",
      "no-loop-func": "error",
      "no-param-reassign": "error",
      "no-sequences": "error",
      "no-shadow-restricted-names": "error",
      "no-unneeded-ternary": "error",
      "no-unused-expressions": "error",
      "no-unused-vars": ["error", { args: "none" }],
      "no-use-before-define": ["error", "nofunc"],
      "no-var": "error",
      "prefer-arrow-callback": "error",
      "prefer-spread": "error",
      "prefer-template": "error",
      "wrap-iife": ["error", "inside"],
      yoda: ["error", "never"],
      "react/jsx-uses-react": "error",
      "react/jsx-uses-vars": "error",
      "react/jsx-no-undef": ["error", { allowGlobals: true }],
      "react/jsx-no-bind": ["error", { allowArrowFunctions: true }],
      "react/jsx-key": "error",
      "react/no-unknown-property": "error",
      "react/no-string-refs": "error",
      "react/no-direct-mutation-state": "error",
      "no-console": "off"
    },
  };