fix(vite)!: replace buffer polyfill with data-uri-to-buffer shim

[Tobbe]

Remove vite-plugin-node-polyfills and the buffer package dependency. Instead of injecting a global Buffer polyfill, alias data-uri-to-buffer (used by stacktracey/get-source for inline source map parsing in the dev error page) to a tiny in-repo shim that returns a Uint8Array.

This avoids:

• Complex CJS/ESM import.meta.url issues during Vite config loading
• pnpm symlink resolution problems
• Injected <script> tags in every dev page load
• The full buffer polyfill dependency overhead

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[greptile-apps]

Greptile Summary

This PR replaces the Vite Buffer polyfill with a focused data URI shim. The main changes are:

• Removes direct buffer and vite-plugin-node-polyfills dependencies.
• Adds a serve-only data-uri-to-buffer shim plugin.
• Switches Cedar's Vite plugin exports and plugin list to the new shim.
• Keeps the util optimizer exclusion for the RSC dev server.
• Updates the project overview docs to name the new shim.

Confidence Score: 4/5

This is close, but the remaining dev-server resolution issue should be fixed before merging.

• The new shim replaces the broad Buffer polyfill in the main Vite plugin path.
• The RSC dev server has the intended util exclusion.
• The sibling SSR dev server can still resolve util to the Browserify polyfill in Storybook workspaces.

packages/vite/src/devFeServer.ts

Important Files Changed

Filename	Overview
packages/vite/src/plugins/vite-plugin-cedar-data-uri-shim.ts	Adds the replacement Vite plugin that aliases data-uri-to-buffer to an inline shim during dev.
packages/vite/src/index.ts	Replaces the node polyfill plugin export and usage with the new data URI shim plugin.
packages/vite/src/devFeServer.ts	Keeps the util optimizer exclusion on the RSC dev server, but leaves the sibling SSR dev server without the same guard.
packages/vite/package.json	Removes the direct Buffer and node polyfill dependencies from the Vite package.
yarn.lock	Updates dependency metadata after removing the direct Vite package polyfill dependencies.
docs/implementation-docs/2026-03-26-cedarjs-project-overview.md	Updates the Vite plugin overview to list the data URI shim instead of node polyfills.

_{Reviews (2): Last reviewed commit: "virtual module" | 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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☁️ Nx Cloud last updated this comment at 2026-07-07 11:49:56 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.2598

Or try it in a new app with yarn dlx create-cedar-app@5.0.0-canary.2598