eliminate redundant null checks

Remove unnecessary null/undefined checks when you already have sufficient validation in place, and use proper type guards instead of type assertions for better null safety.

When you’ve already validated that a value is truthy or non-null, avoid redundant checks that add noise without providing additional safety. Similarly, prefer type guard functions over type assertions to maintain proper null safety.

Examples of improvements:

• If you have if (match) then const [, year, month, date] = match is sufficient - no need for match ?? []
• Instead of checking both response instanceof UndiciResponse && !(response instanceof Response), determine which single check provides the necessary validation
• Replace type assertions like (newModule as Record<string, unknown>) with proper type guard functions that can handle null/undefined cases safely

This approach reduces code complexity while maintaining robust null handling, making your code both cleaner and safer.