.eslintrc.json

{
  "env": {
    "es6": true,
    "mocha": true,
    "node": true
  },
  "extends": "eslint:recommended",
  "parserOptions": {
    "ecmaVersion": 8,
    "sourceType": "module"
  },
  "rules": {
    "array-bracket-spacing": ["error", "never"],
    "block-spacing": ["error", "always"],
    "indent": ["error", 2, {
      "SwitchCase": 1
    }],
    "keyword-spacing": ["error", {
      "before": true,
      "after": true
    }],
    "key-spacing": ["error", {
      "beforeColon": false,
      "afterColon": true
    }],
    "linebreak-style": ["error", "unix"],
    "no-trailing-spaces": ["error"],
    "no-whitespace-before-property": ["error"],
    "object-curly-spacing": ["error", "always"],
    "quotes": ["error", "single", {
      "avoidEscape": true
    }],
    "semi": ["error", "always"],
    "space-before-blocks": ["error"],
    "space-before-function-paren": ["error", {
      "anonymous": "always",
      "named": "always",
      "asyncArrow": "always"
    }],
    "space-infix-ops": ["error"],
    "space-in-parens": ["error", "never"],
    "space-unary-ops": ["error", {
      "words": true,
      "nonwords": false
    }]
  }
}