.eslintrc.json

{
  "env": {
    "es6": true,
    "node": true
  },
  "globals": {
    "BigInt": true
  },
  "extends": "eslint:recommended",
  "parserOptions": {
    "ecmaVersion": 2018
  },
  "rules": {
    "indent": [
      "warn",
      2
    ],
    "linebreak-style": [
      "error",
      "unix"
    ],
    "quotes": [
      "warn",
      "double"
    ],
    "semi": [
      "error",
      "always"
    ],
    "no-var": [
      "warn"
    ],
    "strict": [
      "error"
    ],
    "no-console": [
      "off"
    ],
    "brace-style": [
      "warn",
      "stroustrup",
      { "allowSingleLine": true }
    ],
    "no-constant-condition": [
      "off"
    ],
    "space-before-function-paren": [
      "warn",
      {
        "named": "never",
        "anonymous": "never",
        "asyncArrow": "always"
      }
    ],
    "space-in-parens": [
      "warn"
    ],
    "keyword-spacing": [
      "warn"
    ],
    "space-before-blocks": [
      "warn"
    ],
    "comma-spacing": [
      "warn"
    ],
    "array-bracket-spacing": [
      "warn"
    ],
    "comma-style": [
      "warn"
    ],
    "space-unary-ops": [
      "warn"
    ],
    "key-spacing": [
      "warn"
    ],
    "object-curly-spacing": [
      "warn",
      "always"
    ],
    "object-property-newline": [
      "warn", 
      {
        "allowAllPropertiesOnSameLine": true 
      }
    ],
    "no-multiple-empty-lines": [
      "warn"
    ],
    "no-trailing-spaces": [
      "warn"
    ],
    "no-multi-spaces": [
      "warn"
    ],
    "comma-dangle": [
      "error"
    ]
  }
}