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Explanation of Changes:
1 validatePinataHeaders Function: This utility checks the necessary headers, making the code cleaner and easier to extend.
2. Simplified Blob creation: If the contentType is not provided, the ?? '' ensures an empty string is used, which avoids unnecessary undefined checks.
3. Error Handling: More precise error messages are added to provide better context for potential failures during the fetch call.
General Code Cleanup: Removed unnecessary type annotations where TypeScript could infer them automatically.
This optimized code should now be more maintainable, efficient, and clearer, particularly in terms of error handling and the handling of HTTP requests.