.eslintrc.json

{
  // prettier must be last.
  // https://web.archive.org/web/20210804112206/https://github.com/prettier/eslint-config-prettier
  // "Compare the Top 3 Style Guides and Set Them Up With ESLint"
  // https://web.archive.org/web/20211025033512/https://betterprogramming.pub/comparing-the-top-three-style-guides-and-setting-them-up-with-eslint-98ea0d2fc5b7?gi=14db7a92ff8
  // https://web.archive.org/web/20210910043829/https://stackoverflow.com/questions/30018271/javascript-standard-style-does-not-recognize-mocha
  // https://web.archive.org/web/20210816130619/https://eslint.org/docs/2.13.1/user-guide/configuring
  // https://web.archive.org/web/20211009141701/https://eslint.org/docs/rules/no-var
  "env": {
    "commonjs": true,
    "node": true,
    "mocha": true
  },
  "extends": ["eslint:recommended", "standard", "prettier"],
  // https://web.archive.org/web/20211025055508/https://stackoverflow.com/questions/37558795/nice-way-to-get-rid-of-no-unused-expressions-linter-error-with-chai/43525402
  "overrides": [
    {
      "files": ["*Test.js"],
      "rules": {
        "no-unused-expressions": "off"
      }
    }
  ],
  "parserOptions": {
    "ecmaVersion": 12
  }
}