.eslintrc.json

{
  "env": {
    "browser": true,
    "webextensions": true
  },
  "extends": "airbnb",
  "parser": "babel-eslint",
  "rules": {
    "func-names": 0,
    "no-nested-ternary": 0,
    "max-len": ["error", {
      "code": 100,
      "ignorePattern": "(?:(`|'|\")[^\\1]{70,}\\1)|eslint-disable-line|(?://.*)"
    }],
    "arrow-parens": ["error", "always"],
    "no-underscore-dangle": 0,
    "comma-dangle": ["error", {
      "arrays": "always-multiline",
      "objects": "always-multiline",
      "imports": "always-multiline",
      "exports": "always-multiline",
      "functions": "never"
    }],
    "no-use-before-define": ["error", "nofunc"],
    "no-empty": ["error", { "allowEmptyCatch": true }],
    "no-mixed-operators": ["error", { "allowSamePrecedence": true }],
    "indent": ["error", 2, { "flatTernaryExpressions": true, "SwitchCase": 1 }]
  }
}