.eslintrc.js

module.exports = {
  "extends": "airbnb-base",
  "rules": {
    "func-names": [ "error", "never" ],
    "comma-dangle": ["error", "never"],
    "max-len": ["error", { "code": 150 }],
    "no-param-reassign": ["error", { "ignorePropertyModificationsFor": ["delta"] }],
    "quotes": ["error", "double"],
    "no-underscore-dangle": ["error", { "allowAfterThis": true }],
    "no-mixed-operators": [
      "error",
      {
        "groups": [
          [ "+", "-", "*", "/", "%", "**" ],
          [ "&", "|", "^", "~", "<<", ">>", ">>>" ],
          [ "==", "!=", "===", "!==", ">", ">=", "<", "<=" ],
          [ "&&", "||" ],
          [ "in", "instanceof" ]
        ],
        "allowSamePrecedence": true
      }
    ],
    "no-undef": ["error", { "typeof": false }],
    "prefer-destructuring": ["error", {
      "array": false,
      "object": false
    }, {
      "enforceForRenamedProperties": false
    }]
  },
  "globals": {
    "Darkroom": true,
    "Image": true,
    "fabric": true,
    "document": true,
    "window": true
}
};