.eslintrc

{
  "env": {
    "browser": true,
    "es6": true,
    "node": true,
    "mocha": true
  },
  "extends": "airbnb",
  "rules": {
    // indentation
    "indent": [ 2, 2 ],

    // spacing
    "space-in-parens": [ 2, "never" ],
    "template-curly-spacing": [ 2, "never" ],
    "array-bracket-spacing": [ 2, "never" ],
    "object-curly-spacing": [ 2, "never" ],
    "computed-property-spacing": [ 2, "never" ],
    "no-multiple-empty-lines": [ 2, { "max": 1, "maxEOF": 0, "maxBOF": 0 } ],

    // strings
    "quotes": [ 2, "single", "avoid-escape" ],

    // code arrangement matter
    "no-use-before-define": [ 2, { "functions": false } ],

    // make it meaningful
    "prefer-const": 1,

    // keep it simple
    "complexity": [ 1, 20 ],

    "no-restricted-syntax": [0, 0]
  }
}