.eslintrc.js

module.exports = {
  env: {
    es2021: true
  },
  extends: [
    "eslint:recommended",
    "plugin:@typescript-eslint/recommended",
    "plugin:@typescript-eslint/recommended-requiring-type-checking",
  ],
  parser: "@typescript-eslint/parser",
  parserOptions: {
    project: "tsconfig.json",
    tsconfigRootDir: __dirname,
    ecmaFeatures: {
      jsx: true
    },
    ecmaVersion: 12,
    sourceType: "module",
  },
  plugins: [
    "@typescript-eslint",
  ],
  ignorePatterns: [
    ".eslintrc.js",
  ],
  rules: {
    "@typescript-eslint/strict-boolean-expressions": "error",
    "@typescript-eslint/no-unnecessary-condition": "error",
    "@typescript-eslint/array-type": "error",
    "@typescript-eslint/switch-exhaustiveness-check": "error",
    "@typescript-eslint/prefer-nullish-coalescing": "error",
    "@typescript-eslint/no-unnecessary-boolean-literal-compare": "error",
    "@typescript-eslint/no-invalid-void-type": "error",
    "@typescript-eslint/no-base-to-string": "error"
  },
};