.eslintrc

{
    "extends": "airbnb/base",
    "parserOptions": {
        "ecmaVersion": 6,
        "sourceType": "module",
    },
    "env": {
        "browser": true,
        "node": true,
        "es6": true,
        "mocha": true
    },
    "rules": {
        // 4 chars instead of 2
        "indent": [
            "error",
            4,
            {
                "SwitchCase": 1
            }
        ],

        // Disable last comma
        "comma-dangle": ["error", "never"],

        // Align object keys
        "key-spacing": ["error", {
            "align": "colon"
        }],

        // Max line length to 120
        "max-len": ["warn", 120, 4],

        // Disable no-multi-spaces for alignment
        "no-multi-spaces": ["warn", {
            "exceptions": {
                "VariableDeclarator": true,
                "Property": true,
                "ImportDeclaration": true,
                "AssignmentExpression": true
            }
        }],

        // Allow hasOwnProperty
        "no-prototype-builtins": 0,

        // Disable warning about dev dependencies
        "import/no-extraneous-dependencies": 0,

        // Allow custom requires
        "import/no-dynamic-require": 0,

        // Allow typeof with variables
        "valid-typeof": 0,

        // Allow reassign props to params
        "no-param-reassign": ["error", { "props": false }],

        // Allow console
        "no-console": 0,

        // Disable consistent return
        "consistent-return": 0,

        // Disable return in callbacks
        "array-callback-return": 0,

        // Require allowance
        "global-require": 0,

        // Dangle underscores allowance
        "no-underscore-dangle": 0,

        "no-restricted-syntax": [
          "error",
          {
            selector: "ForInStatement",
            message: "for..in loops iterate over the entire prototype chain, which is virtually never what you want. Use Object.{keys,values,entries}, and iterate over the resulting array.",
          },
          {
            selector: "LabeledStatement",
            message: "Labels are a form of GOTO; using them makes code confusing and hard to maintain and understand.",
          },
          {
            selector: "WithStatement",
            message: "`with` is disallowed in strict mode because it makes code impossible to predict and optimize.",
          },
        ],

        // Disable destructuring
        "prefer-destructuring": 0
    }
}