.eslintrc.json

{
  "env": {
    "node": true,
    "es2021": true,
    "mocha": true
  },
  "extends": "prettier",
  "parser": "@typescript-eslint/parser",
  "parserOptions": {
    "ecmaVersion": "latest",
    "sourceType": "module"
  },
  "plugins": ["@typescript-eslint"],
  "rules": {
    //* Best Practices
    "eqeqeq": "warn",
    "no-invalid-this": "error",
    "no-return-assign": "error",
    "no-unused-expressions": ["error", { "allowTernary": true }],
    "no-useless-concat": "error",
    "no-useless-return": "error",
    "no-constant-condition": ["warn", { "checkLoops": false }],
    "no-unused-vars": "off",
    "@typescript-eslint/no-unused-vars": [
      "warn",
      {
        "argsIgnorePattern": "req|res|next|__|^_",
        "varsIgnorePattern": "^_",
        "caughtErrorsIgnorePattern": "^_"
      }
    ],
    "no-undef": "error",
    "@typescript-eslint/consistent-type-assertions": "error",
    "@typescript-eslint/array-type": "error",
    "@typescript-eslint/no-empty-interface": "error",
    "no-bitwise": ["warn", { "int32Hint": true }],
    //* Enhance Readability
    "indent": ["error", 2, { "SwitchCase": 1 }],
    "no-mixed-spaces-and-tabs": "warn",
    "space-before-blocks": "error",
    "space-in-parens": "error",
    "space-infix-ops": "error",
    "space-unary-ops": "error",
    //
    "keyword-spacing": "error",
    "multiline-ternary": ["error", "never"],
    "no-mixed-operators": "warn",
    "no-param-reassign": "warn",
    "no-redeclare": "warn",
    "no-shadow": "off",
    "@typescript-eslint/no-shadow": "warn",
    //
    "no-multiple-empty-lines": ["error", { "max": 2, "maxEOF": 1 }],
    "no-whitespace-before-property": "error",
    "nonblock-statement-body-position": "error",
    "object-property-newline": ["error", { "allowAllPropertiesOnSameLine": true }],
    //* ES6
    "arrow-spacing": "error",
    "no-confusing-arrow": "error",
    "no-duplicate-imports": "error",
    "no-var": "error",
    "object-shorthand": "off",
    "prefer-const": "error",
    "prefer-template": "warn"
  },
  "overrides": [
    {
      "files": ["*.test.ts"],
      "rules": {
        "no-invalid-this": "off",
        "no-unused-expressions": "off"
      }
    }
  ]
}