.eslintrc.json

{
  "extends": [
    "eslint:recommended",
    "prettier"
  ],
  "plugins": [
    "prettier"
  ],
  "parserOptions": {
    "ecmaVersion": 2016,
    "sourceType": "module"
  },
  "env": {
    "es6": true,
    "node": true,
    "mocha": true
  },
  "rules": {
    "prettier/prettier": ["error", { "singleQuote": true, "printWidth": 100, "semi": false }],
    "arrow-body-style": ["error", "as-needed"],
    "arrow-parens": ["error", "as-needed"],
    "arrow-spacing": ["error"],
    "brace-style": ["error", "1tbs"],
    "curly": ["error", "all"],
    "dot-notation": ["error", { "allowPattern": "^[a-z]+(_[a-z]+)+$" }],
    "eol-last": ["error", "always"],
    "eqeqeq": ["error", "smart"],
    "generator-star-spacing": ["error"],
    "handle-callback-err": [0],
    "indent": ["error", 2],
    "lines-around-directive": ["error", { "before": "never", "after": "always" }],
    "max-len": [1, { "code": 100, "ignoreUrls": true }],
    "new-cap": [0],
    "newline-after-var": ["error", "always"],
    "newline-before-return": ["error"],
    "no-console": [1],
    "no-else-return": ["error"],
    "no-extra-bind": ["error"],
    "no-extra-label": ["error"],
    "no-floating-decimal": ["error"],
    "no-implicit-coercion": ["error", { "allow": ["!!"] }],
    "no-lonely-if": ["error"],
    "no-undef-init": ["error"],
    "no-unneeded-ternary": ["error"],
    "no-useless-computed-key": ["error"],
    "no-useless-rename": ["error"],
    "no-useless-return": ["error"],
    "no-var": ["error"],
    "nonblock-statement-body-position": ["error", "below"],
    "object-curly-spacing": ["error", "always"],
    "object-property-newline": ["error"],
    "object-shorthand": ["error"],
    "prefer-arrow-callback": ["error"],
    "prefer-const": ["error"],
    "prefer-spread": ["error"],
    "prefer-template": ["error"],
    "quotes": ["error", "backtick", { "avoidEscape": true }],
    "require-jsdoc": [0],
    "rest-spread-spacing": ["error"],
    "semi": ["error", "never"],
    "spaced-comment": ["error", "always"],
    "template-curly-spacing": ["error"],
    "valid-jsdoc": [0],
    "wrap-iife": ["error", "inside"],
    "wrap-regex": ["error"],
    "yield-star-spacing": ["error"],
    "yoda": ["error", "never"]
  }
}