Month: 2025-05 Concise monthly summary focusing on business value and technical achievements. Key features delivered: - facebook/squangle: Enum Switch-Case Safety and Readability Improvements. Improved handling of enum switch-case constructs to prevent undefined behavior and improve readability: refactor isDate to a concise boolean expression and add missing case/default labels for enums, strengthening type safety. Commits included: a0922d3ba2a0af39538f80c2c721503d6c638e10 (Handle all enum case statements); cc8d499fb9aa281b32bc238d5be9a5dc50a805a0 (Add missing enum case statements and default labels). - facebook/fbthrift: Robust enum switch-case handling and generated code safety. Addressed enum exhaustiveness and switch-case behavior to prevent undefined behavior when invalid enum values are encountered. Added stricter exhaustiveness checks and default-case handling in generated code, and fixed a missing break in visit_union() for unions with no fields to ensure proper control flow and avoid build breaks. Commits included: d0312221fbcac3ea1255931b05b8ac589f72a435 (Handle all enum case statements); 729da09f79fa0ffe667ecb942e409df6cc6faa67 (Add missing cases default statements); b44cf801fb22bae439ec1c48c5c0ad3403d9efd6 (Add missing break to generated visit_union() code for field-less unions). Major bugs fixed: - fbthrift: Fixed missing break in visit_union() for unions with no fields, preventing unintended control flow issues and build breaks. Also tightened exhaustiveness checks and added default-case handling in generated code to prevent undefined behavior on invalid enum values. Overall impact and accomplishments: - Increased code safety and reliability across two repos by hardening enum handling, resulting in fewer undefined-behavior scenarios during runtime and more robust code generation. - Improved maintainability through explicit enum case coverage and safer default handling, reducing long-term triage effort and risk of regressions. - Demonstrated end-to-end workflow improvements from refactoring for readability (squangle) to generation-time safety (fbthrift). Technologies/skills demonstrated: - C++ enum handling, switch-case safety, and code readability improvements. - Code refactoring for readability and safety. - Generated code safety patterns and exhaustiveness checks. - Build stability fixes and attention to edge-case coverage in union handling.