Run Migration

Run Deco Migration (Fresh/Deno → TanStack)

Runs the Fresh→TanStack migrator from a local checkout of this repo against a target site. The migrator lives in packages/blocks-cli/scripts/migrate/ (entry point packages/blocks-cli/scripts/migrate.ts, also published as the deco-migrate bin of @decocms/blocks-cli). It scaffolds directly onto the split 7.x packages (@decocms/blocks, @decocms/tanstack, @decocms/blocks-admin, @decocms/blocks-cli, @decocms/apps-*).

Scope check first: this flow is for sites still on Fresh/Deno/Preact. If the target is already a TanStack Start site and only its @decocms/start@6.x + @decocms/apps@5.x dependencies are outdated, do NOT run the migrator — follow .agents/skills/decocms-v6-to-v7-upgrade/SKILL.md instead.

How to use

1. Identify the target site workspace. The user will specify which site to migrate. Its origin/main must hold the original Fresh/Deno code.

2. Reset the target to Fresh/Deno state:

   cd <target-dir>
   git checkout origin/main -- .
   git checkout -- .
   git clean -fd
   

   This restores the original Fresh/Deno source code.

3. Remove old install artifacts (migration generates a new package.json):

   rm -rf node_modules package-lock.json bun.lock
   

4. Run the migrator from your local checkout of this repo:

   cd <target-dir>
   npx tsx <path-to-this-repo>/packages/blocks-cli/scripts/migrate.ts --verbose
   

   The script uses --source . by default (current directory). Other flags: --dry-run, --help.

   Against published packages instead of a local checkout, the equivalent is npx -p @decocms/blocks-cli deco-migrate [options].

5. Check the output for errors and review the generated MIGRATION_REPORT.md.

6. If the user wants to test locally after migration:

   cd <target-dir>
   bun install   # or: link the split packages against your local checkout first
                 # (bun link in each packages/* dir, then bun link <pkg> here)
                 # when testing unpublished framework changes
   bun run build
   bun run dev
   

7. Post-migration passes (both ship in blocks-cli): npx -p @decocms/blocks-cli deco-post-cleanup audits generated stubs and soft adapters (--fix applies the safe rules); the verification gates in .agents/skills/decocms-v6-to-v7-upgrade/SKILL.md (regeneration idempotency, typecheck baseline diff, dev smoke on /, /live/_meta, /.decofile) apply to migrated sites the same way.

Important notes

• The migrator's phases (Analyze → Scaffold → Transform → Cleanup → Report → Verify) and its per-phase sources live in packages/blocks-cli/scripts/migrate/ — changes there are picked up immediately when running via tsx (no build step).
• The migrator's DETECT patterns intentionally match legacy @decocms/start / @decocms/apps code in target sites — that is how it finds what to transform. Never "modernize" those patterns to the new package names.
• NEVER push migration results to the target site's remote without explicit user confirmation.
• After running, check for runtime errors and update the migration script if needed.