chore(build): Use nx run-many instead of lerna run

[Tobbe]

The "build:watch" script was the only script still using lerna. Update it to also use nx as the other scripts that executes package-level scripts.

Also gets rid of the tsc --build part which was effectively dead code. The first part of the command chain launched watch scripts that never exits. They stay running to watch for changes. So the first part of the command chain never exits, making the second part never execute.

[netlify]

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[greptile-apps]

Greptile Summary

This PR migrates the build:watch script in the root package.json from lerna run build:watch --parallel; tsc --build to nx run-many -t build:watch, aligning it with the rest of the monorepo's build scripts which already use Nx.

• The dropped tsc --build step is effectively a no-op in practice: because build:watch spawns long-running watch processes, the semicolon-chained tsc --build would only execute after all watchers exit, which doesn't happen during normal development.
• The new invocation follows the same pattern as existing scripts (build, build:pack, check:package), and Nx's run-many runs tasks in parallel by default, preserving the concurrency of the old --parallel flag.

Confidence Score: 5/5

Safe to merge — the change is a straightforward script migration with no functional regression.

The only behavioral difference is dropping tsc --build, which was chained with ; after long-running watch processes and therefore never executed in practice. The new nx run-many -t build:watch command matches the pattern of every other build script in the file and benefits from Nx's built-in parallelism.

No files require special attention.

Important Files Changed

Filename	Overview
package.json	Replaces lerna run build:watch --parallel; tsc --build with nx run-many -t build:watch, consistent with other scripts in the file; no functional regression.

_{Reviews (1): Last reviewed commit: "chore(build): Use nx run-many instead of..." | Re-trigger Greptile}

[nx-cloud]

🤖 Nx Cloud AI Fix

Ensure the fix-ci command is configured to always run in your CI pipeline to get automatic fixes in future runs. For more information, please see https://nx.dev/ci/features/self-healing-ci

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View your CI Pipeline Execution ↗ for commit 99f61fe

Command	Status	Duration	Result
nx run-many -t build:pack --exclude create-ceda...	✅ Succeeded	7s	View ↗
nx run-many -t build	✅ Succeeded	3m 12s	View ↗

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☁️ Nx Cloud last updated this comment at 2026-05-10 13:56:57 UTC

[github-actions]

The changes in this PR are now available on npm.

Try them out by running yarn cedar upgrade -t 5.0.0-canary.13908

Or try it in a new app with yarn dlx create-cedar-app@5.0.0-canary.13908