chore(vite): replace vite-node with Vite's native RunnableDevEnvironment

[lisa-assistant]

Summary

vite-node is a separate package that replicates functionality now built directly into Vite via the Environment API (introduced in Vite 6, and we're on Vite 7).

This replaces ViteNodeServer + ViteNodeRunner + installSourcemapsSupport with Vite's native RunnableDevEnvironment:

Before:

const node = new ViteNodeServer(server, { ... })
installSourcemapsSupport({ getSourceMap: (source) => node.getSourceMap(source) })
const runner = new ViteNodeRunner({ root, base, fetchModule, resolveId })
const result = await runner.executeFile(filePath)

After:

// In server config:
environments: { nodeRunnerEnv: {} }

// Then:
const env = server.environments.nodeRunnerEnv
if (!isRunnableDevEnvironment(env)) { await server.close(); throw new Error(...) }
const result = await env.runner.import(filePath)

Files changed

• packages/cli/src/lib/exec.js — used by yarn cedar exec (script runner)
• packages/prerender/src/graphql/node-runner.ts — used by prerender's GraphQL node runner
• Both package.json files — vite-node dependency removed

Inspired by

remix-run/react-router#14862

🤖 Generated with Claude Code

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[greptile-apps]

Greptile Summary

Replaces vite-node (ViteNodeServer + ViteNodeRunner + installSourcemapsSupport) with Vite 7's native RunnableDevEnvironment across both the cedar exec script runner and the prerender GraphQL node runner, and introduces a new cedarCjsCompatPlugin to handle CJS-to-ESM transformation in those environments.

• cedarCjsCompatPlugin (packages/vite/src/plugins/vite-plugin-cedar-cjs-compat.ts): new enforce: 'pre' plugin that wraps CJS files in an ESM shell using createRequire, with AST-based guards for unsupported patterns (re-exports, getter descriptors, local exports shadowing) and cjs-module-lexer for named-export extraction.
• exec.js and node-runner.ts: both now create a Vite server with a nodeRunnerEnv environment, verify it via isRunnableDevEnvironment, and call env.runner.import() instead of runner.executeFile(); exec.js gains a resolveExtension helper to handle .js \u2192 .ts mapping since customResolver results are final.
• Dependency cleanup: vite-node removed from @cedarjs/cli and @cedarjs/prerender; @cedarjs/vite added to @cedarjs/cli; acorn pinned as a direct dependency of @cedarjs/vite.

Confidence Score: 5/5

The migration is safe to merge; both execution paths are guarded with isRunnableDevEnvironment checks and the new CJS compat plugin has graceful fallback on any parse or lexer failure.

The vite-node removal is a clean like-for-like substitution: fetchModule/resolveId delegation is replaced by the native environment runner, and resolveExtension correctly handles the TS extension-mapping edge case. The only open question is whether cjs-module-lexer should be declared as a direct dep rather than relied upon as a Vite transitive dep.

packages/vite/src/plugins/vite-plugin-cedar-cjs-compat.ts — verify the cjs-module-lexer fallback is acceptable for CJS packages that use exports.foo-style named exports exclusively (the object-literal fallback won’t detect those)

Important Files Changed

Filename	Overview
packages/vite/src/plugins/vite-plugin-cedar-cjs-compat.ts	New CJS-to-ESM transform plugin for RunnableDevEnvironment; well-structured with graceful fallbacks, but relies on cjs-module-lexer as an undeclared transitive Vite dependency
packages/cli/src/lib/exec.js	Migrated from ViteNodeServer/ViteNodeRunner to RunnableDevEnvironment; adds resolveExtension helper for TS project extension mapping and cedarCjsCompatPlugin
packages/prerender/src/graphql/node-runner.ts	Clean migration from ViteNodeRunner to RunnableDevEnvironment; adds explicit error throw after the init null-check to satisfy TypeScript narrowing
packages/vite/src/index.ts	Exports cedarCjsCompatPlugin from the package so exec.js and node-runner.ts can share it
packages/vite/package.json	Adds acorn as a direct dependency (was previously only a transitive dep); cjs-module-lexer is still not declared despite being imported in the new plugin
packages/cli/package.json	Removes vite-node, adds @cedarjs/vite as a direct dependency
docs/implementation-docs/2026-03-26-cedarjs-project-overview.md	Whitespace-only box-drawing alignment fix; all factual content (Vite version, plugin list, package descriptions) remains accurate after this PR

_{Reviews (12): Last reviewed commit: "fix review comment" | Re-trigger Greptile}

[nx-cloud]

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☁️ Nx Cloud last updated this comment at 2026-05-05 12:26:55 UTC

[nx-cloud]

🤖 Nx Cloud AI Fix

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☁️ Nx Cloud last updated this comment at 2026-05-05 10:05:41 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.13892

Or try it in a new app with yarn dlx create-cedar-app@5.0.0-canary.13892