fix(prerender): handle JSON imports during prerender bundling

[lisa-assistant]

Summary

• Rollup's prerender build had no JSON transform plugin, so any page that transitively imported a .json file (e.g. .cedar/gqlorm-schema.json) would fail with RollupError: Expected ';', '}' or <eof>
• Added a simple inline transform plugin that wraps .json file contents as a default export, matching the core behavior of @rollup/plugin-json

Reproduction

RollupError: .cedar/gqlorm-schema.json (2:15): Expected ';', '}' or <eof>
(Note that you need @rollup/plugin-json to import JSON files)

Test plan

• Run yarn cedar prerender --dry-run on a project that imports .cedar/gqlorm-schema.json (directly or transitively) — should no longer throw
• Confirm existing prerender tests still pass

🤖 Generated with Claude Code

[netlify]

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[nx-cloud]

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☁️ Nx Cloud last updated this comment at 2026-04-11 18:42:31 UTC

[greptile-apps]

Greptile Summary

This PR fixes prerender bundling failures caused by .json files (e.g. .cedar/gqlorm-schema.json) not being transformed into valid JS. A small inline Rollup transform plugin is added that round-trips file content through JSON.parse/JSON.stringify and emits export default {...}, matching the core behavior of @rollup/plugin-json without adding a new dependency. The docs in docs/implementation-docs/2026-03-26-cedarjs-project-overview.md remain factually accurate — the high-level prerender description and build pipeline descriptions are unaffected by this change.

Confidence Score: 5/5

Safe to merge — targeted fix with no regressions, correct JSON normalization via JSON.parse/JSON.stringify.

No P0 or P1 issues found. The implementation correctly normalizes JSON content (addressing the prior thread concern about raw byte pass-through). The inline plugin avoids a new dependency, plugin ordering is correct, and the fix is scoped entirely to the prerender bundling path.

No files require special attention.

Important Files Changed

Filename	Overview
packages/prerender/src/build-and-import/buildAndImport.ts	Adds an inline Rollup transform plugin that round-trips JSON through JSON.parse/JSON.stringify before emitting as a default-export ES module, fixing prerender failures on pages with .json transitive imports.

_{Reviews (3): Last reviewed commit: "Merge branch 'main' into lisa/fix-preren..." | Re-trigger Greptile}

[github-actions]

The changes in this PR are now available on npm.

Try them out by running yarn cedar upgrade -t 4.0.0-canary.13785

Or try it in a new app with yarn dlx create-cedar-app@4.0.0-canary.13785