chore(deps): Remove tsx. Use plain node instead

[Tobbe]

One Enum and a few extensions that had to be replaced. After that node just worked. No need for tsx anymore.
Thank you for your service, tsx 🙏 ❤️

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[greptile-apps]

Greptile Summary

This PR removes the tsx TypeScript execution engine from the entire monorepo, replacing it with plain node, which works natively on the project's Node.js 24 baseline (which ships with built-in TypeScript type stripping).

• Dependency removal: tsx is dropped from devDependencies in the root package.json and every package that listed it; all tsx-prefixed script invocations are replaced with node.
• Import extension updates: Intra-package imports in .ts/.mts files are updated from .js/.mjs to .ts/.mts so Node's resolver can find the actual source files directly.
• TypeScript enum → as const: enum Stage in tarsync/output.mts is rewritten as an as const object plus a derived type alias, because Node's type-stripping mode cannot process TypeScript enums (they require compilation, not just erasure).

Confidence Score: 5/5

Safe to merge — all changes are consistent and the project's existing Node 24 baseline fully supports native TypeScript type stripping.

The change is a mechanical dependency removal: scripts swap a wrapper tool for plain node, import specifiers are updated to match actual file extensions, one enum is converted to the equivalent as const pattern, and one dynamic JSON import is replaced with fs.readFileSync. Node 24 ships with built-in TS type stripping so the runtime requirement is already met. All referenced files were confirmed to exist with the correct extensions.

No files require special attention.

Important Files Changed

Filename	Overview
package.json	Removes tsx from devDependencies; switches four scripts from tsx to node
tasks/framework-tools/tarsync/output.mts	Converts TypeScript enum Stage to as const object + type alias; updates import specifiers to .mts
tasks/e2e-background-jobs/run.mts	Replaces makeFilePath-based dynamic JSON import with fs.readFileSync + JSON.parse; updates specifiers to .mts
tasks/e2e-background-jobs/util.mts	Removes makeFilePath helper and its pathToFileURL import now that dynamic JSON import is no longer used
packages/create-cedar-rsc-app/src/index.ts	All intra-package imports switched from .js to .ts extensions for compatibility with Node's native TS resolution
tasks/k6-test/run-k6-tests.mts	Updates import specifiers to .mts; dynamically imports setup.mts files (which exist) instead of setup.mjs
.github/workflows/publish-release-candidate.yml	Replaces yarn tsx with node for the publish RC script step
.github/workflows/smoke-tests-react-18-test.yml	Replaces yarn tsx with node for the downgrade-to-React-18 task step

_{Reviews (3): Last reviewed commit: "remove unused method" | Re-trigger Greptile}

[nx-cloud]

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☁️ Nx Cloud last updated this comment at 2026-07-08 21:33:10 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.2607

Or try it in a new app with yarn dlx create-cedar-app@5.0.0-canary.2607