eslintrc.json

{
  "parserOptions": {
    "ecmaVersion": 2018
  },
  "env": {
    "es6": true,
    "node": true
  },
  "rules": {
    "arrow-body-style": [2, "always"],
    "arrow-parens": [2, "always"],
    "arrow-spacing": [2],
    "comma-style": [2, "first"],
    "comma-spacing": [2, { "before": false, "after": true }],
    "comma-dangle": [2, "never"],
    "dot-notation": [2],
    "eol-last": [2],
    "eqeqeq": [2, "allow-null"],
    "handle-callback-err": [2, "^(err|er)$"],
    "indent": ["error", 2, {
      "ArrayExpression": "first",
      "ObjectExpression": "first",
      "FunctionExpression": {
        "body": 1,
        "parameters": "first"
      },
      "MemberExpression": 1,
      "SwitchCase": 1,
      "CallExpression": {
        "arguments": "first"
      },
      "FunctionDeclaration": {
        "body": 1,
        "parameters": "first"
      }
    }],
    "key-spacing": [2, {
      "beforeColon": false,
      "afterColon": true
    }],
    "keyword-spacing": 2,
    "max-len": [2, 80, 4, { "ignoreComments": true }],
    "no-multi-spaces": [2],
    "no-undef": [2],
    "no-unused-vars": [2, { "vars": "all", "args": "none" }],
    "no-tabs": [2],
    "no-trailing-spaces": [2],
    "quotes": [1, "single", "avoid-escape"],
    "semi": [2, "never"],
    "space-before-blocks": [2, "always"],
    "space-before-function-paren": [2, {
      "anonymous": "never",
      "named": "never",
      "asyncArrow": "always"
    }],
    "space-in-parens": [2, "never"],
    "space-infix-ops": [2],
    "space-unary-ops": [2],
    "strict": [2, "global"]
  }
}