December 2024 monthly summary for DataDog/browser-sdk focusing on robustness of error collection. No new features shipped this month; the major effort was a critical bug fix in error type detection to ensure all Error instances are correctly identified and processed, including custom subclasses. This enhances analytics accuracy and reliability across client applications, reducing missed errors and false negatives. What changed: - Extended error detection logic to treat all Error instances (including custom subclasses) by updating the isError check and related code paths. - Added a dedicated unit test validating handling of an error subclass created via prototype manipulation to ensure broad compatibility. - Associated work and verification tied to commit 166489ddc05b31339571d57d12d7cbf298bb441a. Impact: More accurate error reporting, improved cross-framework compatibility, and higher confidence in error analytics for end users. Technologies/skills demonstrated: JavaScript/TypeScript, unit testing, codebase maintenance, error handling robustness, and test-driven development.