.eslintrc

{
  "extends": "eslint:recommended",
  "root": true,
  "env": {
    "browser": true
  },
  "globals": {
    "Drupal": true,
    "drupalSettings": true,
    "drupalTranslations": true,
    "domready": true,
    "jQuery": true,
    "_": true,
    "matchMedia": true,
    "Backbone": true,
    "Modernizr": true,
    "Popper": true,
    "Sortable": true,
    "CKEDITOR": true
  },
  "rules": {
    "array-bracket-spacing": ["error", "never"],
    "block-scoped-var": "error",
    "brace-style": ["error", "stroustrup", {"allowSingleLine": true}],
    "comma-dangle": ["error", "never"],
    "comma-spacing": "error",
    "comma-style": ["error", "last"],
    "computed-property-spacing": ["error", "never"],
    "curly": ["error", "all"],
    "eol-last": "error",
    "eqeqeq": ["error", "smart"],
    "guard-for-in": "error",
    "indent": ["error", 2, {"SwitchCase": 1}],
    "key-spacing": ["error", {"beforeColon": false, "afterColon": true}],
    "keyword-spacing": ["error", {"before": true, "after": true}],
    "linebreak-style": ["error", "unix"],
    "lines-around-comment": ["error", {"beforeBlockComment": true, "afterBlockComment": false}],
    "new-parens": "error",
    "no-array-constructor": "error",
    "no-caller": "error",
    "no-catch-shadow": "error",
    "no-eval": "error",
    "no-extend-native": "error",
    "no-extra-bind": "error",
    "no-extra-parens": ["error", "functions"],
    "no-implied-eval": "error",
    "no-iterator": "error",
    "no-label-var": "error",
    "no-labels": "error",
    "no-lone-blocks": "error",
    "no-loop-func": "error",
    "no-multi-spaces": "error",
    "no-multi-str": "error",
    "no-native-reassign": "error",
    "no-nested-ternary": "error",
    "no-new-func": "error",
    "no-new-object": "error",
    "no-new-wrappers": "error",
    "no-octal-escape": "error",
    "no-process-exit": "error",
    "no-proto": "error",
    "no-return-assign": "error",
    "no-script-url": "error",
    "no-sequences": "error",
    "no-shadow-restricted-names": "error",
    "no-spaced-func": "error",
    "no-trailing-spaces": "error",
    "no-undef-init": "error",
    "no-undefined": "error",
    "no-unused-expressions": "error",
    "no-unused-vars": ["error", {"vars": "all", "args": "none"}],
    "no-with": "error",
    "object-curly-spacing": ["error", "never"],
    "one-var": ["error", "never"],
    "quote-props": ["error", "consistent-as-needed"],
    "quotes": ["error", "single", "avoid-escape"],
    "semi": ["error", "always"],
    "semi-spacing": ["error", {"before": false, "after": true}],
    "space-before-blocks": ["error", "always"],
    "space-before-function-paren": ["error", {"anonymous": "always", "named": "never"}],
    "space-in-parens": ["error", "never"],
    "space-infix-ops": "error",
    "space-unary-ops": ["error", { "words": true, "nonwords": false }],
    "spaced-comment": ["error", "always"],
    "strict": ["error", "function"],
    "yoda": ["error", "never"],
    "max-nested-callbacks": ["warn", 3],
    "valid-jsdoc": ["warn", {
      "prefer": {
        "returns": "return",
        "property": "prop"
      },
      "requireReturn": false
    }]
  }
}