Prisma Next introduces a `dataTransform` operation that lets developers write data migrations in TypeScript alongside schema changes, using the same type-safe query builder as application code. Instead of raw SQL or out-of-band scripts, a `dataTransform` takes `check` and `run` callbacks typed against a contract snapshot specific to that migration point. The migration file compiles to a JSON ops file committed to the repo, which is what the migration runner executes — never the TypeScript itself. This approach provides autocomplete, type checking, pre/post-checks on every operation, and reviewable SQL output. It works for both SQL databases and MongoDB, and is available in Prisma Next Early Access (not yet production-ready).
