.eslintrc

{
  "env": {
      "browser": true,
      "node": true,
  },
  "globals": {
      "Promise": false
  },
  "rules": {
      "semi": ["warn", "never"],
      "quotes": ["error", "single"],
      "no-undef": "error",
      "no-unused-vars": "error",
      "no-redeclare": "error",
      "no-use-before-define": "error",
      "no-dupe-args": "error",
      "no-dupe-keys": "error",
      "no-unreachable": "error",
      "block-scoped-var": "error",
      "class-methods-use-this": "warn",
      "no-param-reassign": "error",
      "vars-on-top": "error",
      "no-shadow-restricted-names": "error",
      "indent": ["warn", 2],
      "operator-assignment": ["error", "always"],
      "space-before-blocks": "warn",
      "space-before-function-paren": ["warn", "never"],
      "space-in-parens": ["warn", "never"],
      "arrow-spacing": "warn",
      "constructor-super": "error",
      "no-this-before-super": "error",
      "no-useless-constructor": "error",
      "no-class-assign": "error",
      "no-confusing-arrow": ["error", {"allowParens": true}],
      "no-const-assign": "error",
      "no-dupe-class-members": "error",
      "no-duplicate-imports": "error",
      "no-var": "error",
      "object-shorthand": "error",
      "prefer-const": "warn",
      "no-invalid-this": "error",
      "space-infix-ops": "warn",
      "comma-spacing": ["warn", { "before": false, "after": true }]
  },
  "parserOptions": {
      "ecmaVersion": 8,
      "sourceType": "module",
      "ecmaFeatures": {
          "impliedStrict": true
      }
  }
}