.eslintrc.json

{
  "plugins": [],
  "extends": [
    "eslint:recommended"
  ],  
  "env": {
    "node": true,
    "jest": true
  },
  "parserOptions": {
    "sourceType": "module",
    "ecmaVersion": "latest",
    "allowImportExportEverywhere": true
  },
  "globals": {
  },
  "rules": {
    "no-unused-vars": [ "error", {
      "vars": "all",
      "args": "after-used",
      "ignoreRestSiblings": false
    }],
    "global-require": 0,
    "no-sequences": 0,
    "strict": [2, "never"],
    "one-var": [2, {
      "let": "always",
      "const": "never"
    }],
    "space-in-parens": [2, "never" ],
    "import/newline-after-import": 0,
    "indent": [2, 2, {
      "flatTernaryExpressions": true,
      "VariableDeclarator": {
        "let": 2,
        "const": 3
      }
    }],
    "camelcase": [2, {"properties": "never", "allow": [
      "node_module",
      "first_parent",
      "next_module"
    ] }],
    "no-underscore-dangle": 0,
    "func-names": [2, "never"],
    "newline-per-chained-call": 0,
    "max-len": [2, 80],
    "comma-dangle": [2, "never"],
    "no-mixed-operators": 0,
    "no-plusplus": 0,
    "no-console": 0,
    "semi": [2, "never"],
    "nonblock-statement-body-position": 0,
    "arrow-parens": [2, "as-needed"],
    "space-before-function-paren": [2, "always"],
    "function-paren-newline": 0,
    "consistent-return": 0,
    "array-callback-return": 0,
    "prefer-const": 0,
    "prefer-object-spread": 0,
    "curly": 0,
    "operator-linebreak": 0,
    "no-param-reassign": 0,
    "key-spacing": [2],
    "implicit-arrow-linebreak": 0,
    "no-shadow": [0, "warn", {
        "allow": [ "err" ]
      }
    ],
    "prefer-arrow-callback": [2, {
      "allowNamedFunctions": true
    }],
    "no-return-assign": 0,
    "no-use-before-define": [2, "nofunc"],
    "no-nested-ternary": 0,
    "array-bracket-spacing": [2, "never"],
    "prefer-destructuring": 0,
    "class-methods-use-this": 0,
    "no-confusing-arrow": 0
  }
}