chore(babel-config): forJest sentinel

[Tobbe]

Match #2058 so that we have a consistent pattern going forward for babel -> vite plugin rewrites

[netlify]

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[greptile-apps]

Greptile Summary

This PR narrows the web Babel dev fatal error page transform to Jest. The main changes are:

• The Babel plugin now runs only when forJest is true.
• The comments now point prerender and Vite to their Rollup and Vite plugins.

Confidence Score: 4/5

The main build, Jest, Vite, and prerender paths look covered, but default Babel consumers can now keep the dev fatal error page import.

• Jest still passes the new sentinel.
• Vite and prerender have separate removal plugins.
• Flagless Babel config callers no longer get the production-only removal transform.

packages/babel-config/src/web.ts

Important Files Changed

Filename	Overview
packages/babel-config/src/web.ts	Updates the production DevFatalErrorPage removal gate from non-Vite Babel consumers to the Jest sentinel path.

_{Reviews (1): Last reviewed commit: "chore(babel-config): `forJest` sentinel" | Re-trigger Greptile}

[nx-cloud]

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☁️ Nx Cloud last updated this comment at 2026-07-08 14:20:45 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.2605

Or try it in a new app with yarn dlx create-cedar-app@5.0.0-canary.2605