Systematic Type Migration

Type migration safety depends on integration testing first—write end-to-end tests before changing types to catch component incompatibility early. Systematic Type Migration guides this workflow: verify full user flows in tests, then migrate files incrementally, running verification after each change to prevent production breakage.

Use an integration-first, file-by-file approach: write integration tests covering all affected components before migration begins, then update each file with verification after each atomic commit. This systematic workflow ensures type-safe implementations replace legacy types while maintaining end-to-end functionality throughout the transition.

Yes. Incremental type migration with per-file updates and baseline test preservation lets you refactor legacy types to type-safe versions without halting development. Integration tests validate each phase, catching component incompatibilities before they reach production.

Integration tests establish a baseline that catches when refactored types break component connections. By verifying full user flows before migration, you prevent silent incompatibilities that integration-only testing after the fact would miss, ensuring safe transitions in real-world codebases.

End-to-end verification across all migration phases confirms completion. All integration tests pass, atomic commits preserve baseline test coverage, and component functionality remains intact across the refactored type-safe implementations—validating the migration succeeded without integration breakage.