.eslintrc.json

{
  "env": {
    "node": true,
    "mocha": true
  },

  "parserOptions": {
    "ecmaVersion": 9
  },

  "globals": {
    "Promise": true,
    "_": true,
    "async": true
  },

  "rules": {
    "callback-return": [
      "error", ["done", "proceed", "next", "onwards", "callback", "cb"]
    ],
    "camelcase": ["warn", {
      "properties": "always"
    }],
    "comma-style": ["warn", "last"],
    "curly": ["error"],
    "eqeqeq": ["error", "always"],
    "eol-last": ["warn"],
    "no-undef": 2,
    "handle-callback-err": ["error"],
    "arrow-body-style": ["off", 2],
    "indent": ["off", 2],
    "linebreak-style": ["error", "unix"],
    "no-dupe-keys": ["error"],
    "no-duplicate-case": ["error"],
    "no-extra-semi": ["warn"],
    "no-labels": ["error"],
    "no-mixed-spaces-and-tabs": [2, "smart-tabs"],
    "no-redeclare": ["warn"],
    "no-return-assign": ["error", "always"],
    "no-sequences": ["error"],
    "no-trailing-spaces": ["warn"],
    "no-unexpected-multiline": ["warn"],
    "no-unreachable": ["warn"],
    "no-magic-numbers": ["off"],
    "max-params": ["off"],
    "max-len": ["off"],
    "max-nested-callbacks": ["off"],
    "new-cap": ["off"],
    "consistent-this": ["error", "that"],
    "no-unused-vars": [
      "warn",
      {
        "caughtErrors": "all",
        "caughtErrorsIgnorePattern": "^unused($|[A-Z].*$)"
      }
    ],
    "no-use-before-define": ["error", {
      "functions": false
    }],
    "no-var": 2,
    "one-var": ["warn", "never"],
    "prefer-arrow-callback": ["warn", {
      "allowNamedFunctions": true
    }],
    "quotes": [
      "warn",
      "single",
      {
        "avoidEscape": false,
        "allowTemplateLiterals": true
      }
    ],
    "semi": ["error", "never"],
    "semi-spacing": ["warn", {
      "before": false,
      "after": true
    }],
    "semi-style": ["warn", "last"],
    "space-before-function-paren": ["off", 2],
    "prettier/prettier": "error"
  },
  "extends": [
    "formidable/rules/eslint/best-practices/on",
    "formidable/rules/eslint/es6/on",
    "formidable/rules/eslint/errors/off",
    "formidable/rules/eslint/strict/on",
    "formidable/rules/eslint/node/off",
    "formidable/rules/eslint/style/on",
    "formidable/rules/eslint/variables/on",
    "prettier"
  ],
  "plugins": [
    "prettier"
  ]
}