.eslintrc

{
  "extends": ["prettier", "eslint:recommended", "plugin:markdown/recommended-legacy"],
  "parserOptions": {
    "ecmaVersion": "latest"
  },
  "plugins": ["markdown", "async-await"],
  "env": {
    "node": true,
    "es6": true
  },
  "rules": {
    "template-curly-spacing": ["error", "never"],
    "prefer-template": "error",
    "no-useless-call": "error",
    "no-lonely-if": "error",
    "indent": [
      "error",
      2,
      {
        "SwitchCase": 1
      }
    ],
    "no-else-return": [
      "error",
      {
        "allowElseIf": false
      }
    ],
    "eqeqeq": "error",
    "no-invalid-this": "error",
    "consistent-this": "error",
    "prefer-arrow-callback": "error",
    "prefer-const": "error",
    "arrow-body-style": ["error", "as-needed"],
    "no-var": "error",
    "no-use-before-define": "error",
    "strict": ["error", "global"]
  },
  "overrides": [
    {
      "files": ["**/*.ts"],
      "parser": "@typescript-eslint/parser",
      "extends": ["plugin:@typescript-eslint/recommended"],
      "plugins": ["@typescript-eslint"],
      "rules": {
        "@typescript-eslint/no-empty-interface": "off",
        "@typescript-eslint/no-explicit-any": "off",
        "arrow-parens": "off",
        "no-restricted-syntax": [
          "error",
          {
            "selector": "ImportDeclaration[source.value=/^\\./][source.value!=/\\.(js)$/]",
            "message": "Local imports must have the explicit extension"
          }
        ]
      }
    },
    {
      "files": ["**/*.md/*js", "**/*.md/*ts"],
      "rules": {
        "no-undef": "off",
        "no-unused-vars": "off",
        "@typescript-eslint/no-unused-vars": "off",
        "no-console": "off",
        "no-unused-labels": "off",
        "strict": "off",
        "prefer-arrow-callback": "off"
      },
      "parserOptions": {
        "sourceType": "module"
      }
    },
    {
      "files": ["**/**/*.test.*"],
      "rules": {
        "arrow-parens": ["error", "always"]
      }
    },
    {
      "files": ["**/*.mjs"],
      "parserOptions": {
        "sourceType": "module"
      }
    }
  ]
}