TS7022

'window' implicitly has type 'any' because it does not have a type annotation and is referenced directly or indirectly in its own initializer.

Broken Code ❌

var window = window || null;

{
  "compilerOptions": {
    "lib": ["es2017"]
  }
}

Fixed Code ✔️

The above error can occur when TypeScript doesn't know about the window interface. Make sure to add "dom" to your list of known runtime libraries in your compiler options:

{
  "compilerOptions": {
    "lib": ["dom", "es2017"]
  }
}