code-migration

Strategies and patterns for safe code migrations and upgrades. Use when upgrading frameworks, migrating between technologies, handling deprecations, or planning incremental migrations. Triggers: migration, migrate, upgrade, version upgrade, breaking change, deprecation, codemod, codemods, AST transformation, jscodeshift, ts-morph, framework migration, database migration, schema migration, legacy code, modernize, modernization, refactoring, feature flags, rollback, strangler fig, blue-green deployment, canary release, shadow mode, parallel run.