.eslintrc.json

{
  "env": {
    "browser": true,
    "commonjs": true,
    "es6": true,
    "node": true,
    "mocha": true,
    "jasmine": true,
    "jquery": true
  },
  "parserOptions": {
    "ecmaFeatures": {
      "jsx": true
    },
    "sourceType": "module"
  },
  "rules": {
    "no-multiple-empty-lines": ["error", { "max": 3, "maxEOF": 1 }],
    "quotes": [2, "single", { "avoidEscape": true }],
    "no-const-assign": "warn",
    "no-this-before-super": "warn",
    "max-len": ["error", { "code": 120, "ignoreUrls": true }],
    "no-undef": "warn",
    "no-unreachable": "warn",
    "no-unused-vars": "warn",
    "constructor-super": "warn",
    "valid-typeof": "warn",
    "indent": [
      "error",
      2,
      {
        "FunctionExpression": { "parameters": "first" },
        "ArrayExpression": "first",
        "ObjectExpression": "first",
        "VariableDeclarator": { "var": 2, "let": 2, "const": 3 }
      }
    ],
    "key-spacing": [
      "error",
      {
        "multiLine": {
          "beforeColon": false,
          "afterColon": true
        },
        "align": {
          "beforeColon": true,
          "afterColon": true,
          "on": "colon"
        }
      }
    ]
  }
}