`@tanstack/ai-code-mode` should not depend on `esbuild` (Node.js-only, breaks Cloudflare/edge bundlers)

[husayt]

TanStack AI version

0.1.4

Framework/Library version

@tanstack/ai-code-mode

Describe the bug and the steps to reproduce it

Problem

@tanstack/ai-code-mode imports esbuild (specifically transform/stripTypeScript) at the module level. This causes two issues for edge/Cloudflare Workers deployments:

1. Browser bundle: esbuild is a Node.js native binary — it must be stubbed/aliased out to prevent the browser build from failing.
2. Server bundle (Cloudflare Pages / Workers): esbuild 0.25+ added Yarn PnP detection via require("pnpapi") in its main.js. Cloudflare's bundler cannot resolve this module and does not allow externals, causing:

   ERROR: Cannot resolve "pnpapi" from "…/esbuild/lib/main.js" and externals are not allowed!
   

Workarounds required today

• Vite alias to a no-op stub: esbuild → esbuild-browser-stub.ts
• Custom Nitro Rollup plugin to stub pnpapi as a virtual module

Suggested fix

Replace the esbuild dependency with a lightweight, pure-JS TypeScript stripper such as:

• oxc-transform — Rust/WASM, edge-compatible
• @babel/plugin-transform-typescript
• A simple regex/comment-strip approach if only basic TS stripping is needed for the QuickJS sandbox

Environment

• @tanstack/ai-code-mode: (check your version)
• esbuild: 0.25.12
• Deploy target: Cloudflare Pages (Nitro)

Your Minimal, Reproducible Example - (Sandbox Highly Recommended)

Screenshots or Videos (Optional)

No response

Do you intend to try to help solve this bug with your own PR?

None

Terms & Code of Conduct

• I agree to follow this project's Code of Conduct
• I understand that if my bug cannot be reliable reproduced in a debuggable environment, it will probably not be fixed and this issue may even be closed.