My default configuration files.

.editorconfig

root = true

[*]
indent_style = space
indent_size = 4
end_of_line = lf
charset = utf-8
trim_trailing_whitespace = true
insert_final_newline = true

[{*.json, *.yml, .eslintrc}]
indent_size = 2

.eslintrc

{
  "parserOptions": {
    "ecmaVersion": 6,
    "sourceType": "script",
    "ecmaFeatures": {
      "arrowFunctions": true,
      "binaryLiterals": true,
      "blockBindings": true,
      "classes": true,
      "defaultParams": true,
      "destructuring": true,
      "forOf": true,
      "generators": true,
      "modules": true,
      "objectLiteralComputedProperties": true,
      "objectLiteralDuplicateProperties": true,
      "objectLiteralShorthandMethods": true,
      "objectLiteralShorthandProperties": true,
      "octalLiterals": true,
      "regexUFlag": true,
      "regexYFlag": true,
      "restParams": true,
      "spread": true,
      "superInFunctions": true,
      "templateStrings": true,
      "unicodeCodePointEscapes": true,
      "globalReturn": true,
      "jsx": false,
      "experimentalObjectRestSpread": false
    }
  },

  "env": {
    "browser": false,
    "node": true,
    "commonjs": false,
    "es6": true,
    "worker": false,
    "amd": false,
    "mocha": false,
    "jasmine": false,
    "jest": false,
    "phantomjs": false,
    "protractor": false,
    "qunit": false,
    "jquery": false,
    "prototypejs": false,
    "shelljs": false,
    "meteor": false,
    "mongo": false,
    "applescript": false,
    "nashorn": false,
    "serviceworker": false,
    "embertest": false,
    "webextensions": false
  },

  "globals": {

  },

  "plugins": [

  ],

  "rules": {
    "comma-dangle": [2, "never"],
    "no-cond-assign": [2, "always"],
    "no-console": 0,
    "no-constant-condition": 2,
    "no-control-regex": 2,
    "no-debugger": 2,
    "no-dupe-args": 2,
    "no-dupe-keys": 2,
    "no-duplicate-case": 2,
    "no-empty-character-class": 2,
    "no-empty": 2,
    "no-ex-assign": 2,
    "no-extra-boolean-cast": 2,
    "no-extra-parens": [2, "all"],
    "no-extra-semi": 2,
    "no-func-assign": 2,
    "no-inner-declarations": [2, "both"],
    "no-invalid-regexp": 2,
    "no-irregular-whitespace": 2,
    "no-negated-in-lhs": 2,
    "no-obj-calls": 2,
    "no-regex-spaces": 2,
    "no-sparse-arrays": 2,
    "no-unexpected-multiline": 2,
    "no-unreachable": 2,
    "use-isnan": 2,
    "valid-jsdoc": 0,
    "valid-typeof": 2,

    "accessor-pairs": [2, { "getWithoutSet": true }],
    "block-scoped-var": 2,
    "complexity": 0,
    "consistent-return": 2,
    "curly": [2, "all"],
    "default-case": 2,
    "dot-location": [2, "property"],
    "dot-notation": [2, { "allowKeywords": true, "allowPattern": "^[a-z]+(_[a-z]+)+$" }],
    "eqeqeq": [2, "allow-null"],
    "guard-for-in": 2,
    "no-alert": 2,
    "no-caller": 2,
    "no-case-declarations": 2,
    "no-div-regex": 2,
    "no-else-return": 2,
    "no-empty-pattern": 2,
    "no-eq-null": 2,
    "no-eval": 2,
    "no-extend-native": 0,
    "no-extra-bind": 2,
    "no-fallthrough": 2,
    "no-floating-decimal": 2,
    "no-implicit-coercion": [2, { "boolean": true, "number": true, "string": true }],
    "no-implied-eval": 2,
    "no-invalid-this": 2,
    "no-iterator": 2,
    "no-labels": 0,
    "no-lone-blocks": 2,
    "no-loop-func": 2,
    "no-magic-numbers": [2, { "ignore": [0, 1, 2], "ignoreArrayIndexes": true }],
    "no-multi-spaces": [2, { "exceptions": {} }],
    "no-multi-str": 2,
    "no-native-reassign": [2, { "exceptions": [] }],
    "no-new-func": 2,
    "no-new-wrappers": 2,
    "no-new": 2,
    "no-octal-escape": 2,
    "no-octal": 2,
    "no-param-reassign": 0,
    "no-process-env": 0,
    "no-proto": 2,
    "no-redeclare": [2, { "builtinGlobals": true }],
    "no-return-assign": [2, "except-parens"],
    "no-script-url": 2,
    "no-self-compare": 2,
    "no-sequences": 2,
    "no-throw-literal": 2,
    "no-unused-expressions": [2, { "allowShortCircuit": true, "allowTernary": true }],
    "no-useless-call": 2,
    "no-useless-concat": 2,
    "no-void": 2,
    "no-warning-comments": [2, { "terms": ["todo", "fixme", "xxx"], "location": "anywhere" }],
    "no-with": 2,
    "radix": [2, "always"],
    "vars-on-top": 2,
    "wrap-iife": [2, "outside"],
    "yoda": [2, "never", { "exceptRange": false, "onlyEquality": false }],

    "strict": [2, "function"],

    "init-declarations": [2, "always"],
    "no-catch-shadow": 2,
    "no-delete-var": 2,
    "no-label-var": 2,
    "no-shadow-restricted-names": 2,
    "no-shadow": [2, { "builtinGlobals": true, "hoist": "all", "allow": [] }],
    "no-undef-init": 2,
    "no-undef": [2, { "typeof": true }],
    "no-undefined": 2,
    "no-unused-vars": [2, { "vars": "all", "args": "after-used", "argsIgnorePattern": "" }],
    "no-use-before-define": 2,

    "callback-return": [2, ["callback", "cb", "next"]],
    "global-require": 2,
    "handle-callback-err": [2, "^(err|error)$"],
    "no-mixed-requires": [0, { "grouping": false }],
    "no-new-require": 2,
    "no-path-concat": 2,
    "no-process-exit": 2,
    "no-restricted-modules": [0, ""],
    "no-sync": 2,

    "array-bracket-spacing": [2, "never"],
    "block-spacing": [2, "always"],
    "brace-style": [2, "1tbs", { "allowSingleLine": true }],
    "camelcase": [2, { "properties": "always" }],
    "comma-spacing": [2, { "before": false, "after": true }],
    "comma-style": [2, "last"],
    "computed-property-spacing": [2, "never"],
    "consistent-this": [2, "that"],
    "eol-last": 2,
    "func-names": 2,
    "func-style": [2, "declaration", { "allowArrowFunctions": false }],
    "id-length": [0, { "min": 1, "max": 20, "properties": "never", "exceptions": [] }],
    "id-match": 0,
    "indent": 0,
    "jsx-quotes": 0,
    "key-spacing": [2, { "beforeColon": false, "afterColon": true }],
    "keyword-spacing": [2, { "before": true, "after": true }],
    "linebreak-style": [2, "unix"],
    "lines-around-comment": 0,
    "max-depth": 0,
    "max-len": 0,
    "max-nested-callbacks": [2, 5],
    "max-params": 0,
    "max-statements": 0,
    "new-cap": [2, { "capIsNewExceptions": [] }],
    "new-parens": 2,
    "newline-after-var": [2, "always"],
    "no-array-constructor": 2,
    "no-bitwise": 0,
    "no-continue": 0,
    "no-inline-comments": 2,
    "no-lonely-if": 2,
    "no-mixed-spaces-and-tabs": 2,
    "no-multiple-empty-lines": [2, { "max": 1, "maxEOF": 1 }],
    "no-negated-condition": 2,
    "no-nested-ternary": 2,
    "no-new-object": 2,
    "no-plusplus": 0,
    "no-restricted-syntax": 0,
    "no-spaced-func": 2,
    "no-ternary": 0,
    "no-trailing-spaces": [2, { "skipBlankLines": false }],
    "no-underscore-dangle": [2, { "allow": [] }],
    "no-unneeded-ternary": 2,
    "object-curly-spacing": [2, "always"],
    "one-var": 0,
    "operator-assignment": [2, "always"],
    "operator-linebreak": [2, "none", { "overrides": {} }],
    "padded-blocks": 0,
    "quote-props": [2, "as-needed"],
    "quotes": [2, "single"],
    "require-jsdoc": 0,
    "semi-spacing": [2, { "before": false, "after": true }],
    "semi": [2, "always"],
    "sort-vars": 0,
    "space-before-blocks": [2, "always"],
    "space-before-function-paren": [2, "always"],
    "space-in-parens": [2, "never"],
    "space-infix-ops": [2, { "int32Hint": false }],
    "space-unary-ops": [1, { "words": true, "nonwords": false }],
    "spaced-comment": [2, "always"],
    "wrap-regex": 2,

    "arrow-body-style": [2, "as-needed"],
    "arrow-parens": [2, "always"],
    "arrow-spacing": [2,  { "before": true, "after": true }],
    "constructor-super": 2,
    "generator-star-spacing": [2, { "before": true, "after": false }],
    "no-arrow-condition": 2,
    "no-class-assign": 2,
    "no-const-assign": 2,
    "no-dupe-class-members": 2,
    "no-this-before-super": 2,
    "no-var": 2,
    "object-shorthand": [2, "always"],
    "prefer-arrow-callback": 2,
    "prefer-const": 2,
    "prefer-reflect": [2, { "exceptions": [] }],
    "prefer-spread": 2,
    "prefer-template": 2,
    "require-yield": 2,
  }
}

.gitattributes

* text=auto

.travis.yml

sudo: false
language: node_js
node_js: "stable"