- [TypeScript](https://www.typescriptlang.org/) version 4.6 or later.

- You must enable `strict` mode in your `tsconfig.json` file's `compilerOptions`.

  ```ts title="tsconfig.json"
  {
    // ...
    "compilerOptions": {
      // ...
      "strict": true
      // ...
    }
    // ...
  }
  ```
