.eslintrc.json

{
  "plugins": ["babel", "markdown"],
  "extends": ["eslint:recommended", "plugin:react/recommended"],
  "rules": {
    "no-console": 0,
    "no-class-assign": 0,
    "no-mixed-spaces-and-tabs": 0,
    "comma-dangle": 0,
    "no-unused-vars": 1,
    "eqeqeq": [2, "smart"],
    "no-useless-concat": 2,
    "default-case": 2,
    "no-self-compare": 2,
    "prefer-const": 2,
    "no-underscore-dangle": [2, { "allowAfterThis": true }],
    "object-shorthand": 1,
    "babel/no-invalid-this": 2,
    "array-callback-return": 2,
    "valid-typeof": 2,
    "arrow-body-style": 2,
    "require-await": 2,
    "react/prop-types": 0,
    "no-var": 2,
    "linebreak-style": [2, "unix"],
    "semi": [1, "always"]
  },
  "env": {
    "es6": true,
    "browser": true
  },
  "parser": "babel-eslint",
  "parserOptions": {
    "sourceType": "module",
    "ecmaVersion": 2018,
    "ecmaFeatures": {
      "modules": true
    }
  },

  "overrides": [
    {
      "files": ["*.md"],
      "rules": {
        "react/jsx-no-undef": 0,
        "react/react-in-jsx-scope": 0,
        "semi": 0,
        "no-undef": 0
      }
    }
  ]
}