.eslintrc.json

{
  "root": true,
  "env": {
    "es2020": true,
    "jest": true
  },

  "ignorePatterns": [".eslintrc.js"],
  "extends": [
    "eslint:recommended",
    "plugin:@typescript-eslint/recommended",
    "plugin:prettier/recommended",
    "plugin:import/recommended",
    "plugin:import/typescript"
  ],
  "globals": {
    "Atomics": "readonly",
    "SharedArrayBuffer": "readonly"
  },
  "parser": "@typescript-eslint/parser",
  "parserOptions": {
    "ecmaVersion": "es2020",
    "sourceType": "module",
    "project": "./tsconfig.test.json"
  },
  "plugins": ["@typescript-eslint", "prettier"],
  "rules": {
    // base eslint rules
    "curly": "error",
    "indent": "off",
    "semi": ["error", "always"],
    "no-cond-assign": ["error", "always"],
    "init-declarations": "off",
    "no-console": "error", // you should use the Logger to avoid this
    "eqeqeq": "error",
    "no-promise-executor-return": "error",
    "no-template-curly-in-string": "error",
    "no-unreachable-loop": "error",
    "no-unsafe-optional-chaining": "error",
    "require-atomic-updates": "error",
    "array-callback-return": "error",
    "no-prototype-builtins": "off",
    "require-await": "error",
    "no-var": "error",

    // eslint & typescript-eslint rule pairs
    "no-throw-literal": "off",
    "@typescript-eslint/no-throw-literal": "error",
    "no-use-before-define": "error",
    "@typescript-eslint/no-use-before-define": "error",

    // typescript-eslint rules
    "@typescript-eslint/prefer-for-of": "error",
    "@typescript-eslint/no-dynamic-delete": "error",
    "@typescript-eslint/no-non-null-asserted-optional-chain": "error",
    "@typescript-eslint/prefer-optional-chain": "error",
    "@typescript-eslint/switch-exhaustiveness-check": "error",
    "@typescript-eslint/no-explicit-any": "error",
    "@typescript-eslint/no-non-null-assertion": "error", // turning this off removes type safety. use an if(){} to check for the null
    "@typescript-eslint/no-var-requires": "error",
    "@typescript-eslint/no-misused-promises": ["error", { "checksConditionals": true, "checksVoidReturn": true }],
    "@typescript-eslint/no-unused-vars": [
      "error",
      {
        "vars": "all",
        "args": "after-used",
        "ignoreRestSiblings": false
      }
    ],
    "@typescript-eslint/no-empty-function": "error",
    "@typescript-eslint/explicit-module-boundary-types": "off",

    "import/no-unresolved": "off",
    "import/first": "error"
  }
}