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fix: resolve auth test failure for Convex Better Auth with Polar payments

The test was failing due to two issues:

1. Undefined fs and path references - The test using fs.readFile() and
   path.join() but only imported readFile() and join(). Fixed by using
   the correctly imported functions throughout.

2. Outdated env file assertion - The test expected "# POLAR_PRODUCT_ID_PRO="
   but the CLI now generates "# npx convex env set POLAR_PRODUCT_ID_PRO=...".
   Updated the assertion to match the current generated format.

Result: All 99 auth tests now pass ✓

PR Review — Verified Issues

I scaffolded projects from this branch to verify the issues below. Each one was confirmed against actual generated output.

1. createFileRoute removed — breaks tanstack-router/start routing (Critical)

The PR replaces the tanstack-router and tanstack-start dashboard templates entirely, removing:

import { createFileRoute } from "@tanstack/react-router";

export const Route = createFileRoute("/dashboard")({
  component: RouteComponent,
});

The generated dashboard.tsx uses export default function Dashboard() instead, which does not register as a route in TanStack Router's file-based routing system. Other routes in the same generated project (e.g. index.tsx) correctly use createFileRoute.

This breaks ALL Convex + Better Auth + tanstack-router/start projects, even with --payments none, because the template replacement overwrites the entire file regardless of the payments flag.

2. polar.ts.hbs contains embedded template metadata (Critical)

The generated packages/backend/convex/polar.ts has literal garbage at lines 61–66:

`],
  ["payments/polar/convex/web/react/tanstack-start/src/functions/get-payment.ts.hbs", `import { createServerFn } from "@tanstack/react-start";

export const getPayment = createServerFn({ method: "GET" }).handler(async () => {
  return null;
});

This is template registry metadata that leaked into the .hbs file. The get-payment.ts.hbs content was accidentally concatenated into polar.ts.hbs. The generated backend file is invalid JavaScript and will not parse.

3. buttonVariants import from nonexistent package (Medium)

The dashboard template imports:

import { buttonVariants } from "@{{projectName}}/ui/components/button";

When scaffolding with --ui-library none, there is no packages/ui workspace package. The buttonVariants export exists at apps/web/src/components/ui/button.tsx (local path), but the workspace package import will fail at build time. This should either be conditional on the UI library or use a relative/alias import.

4. Missing spaces after commas (Minor)

// post-installation.ts
getPolarInstructions(backend,packageManager)

// env-vars.ts
buildConvexCommentBlocks(frontend, auth,payments, examples)
buildConvexBackendVars(frontend, auth,payments, examples)

5. Stub get-payment.ts.hbs returns null (Minor)

payments/polar/convex/web/react/tanstack-start/src/functions/get-payment.ts.hbs returns null with no actual logic. The non-convex tanstack-start version has a working implementation using authClient.customer.state(). Either implement this for Convex or remove the file.

What looks good

• Compatibility and prompt changes (removing the Convex exclusion) are clean
• Dependency wiring (@convex-dev/polar, @polar-sh/sdk, @polar-sh/checkout) is correct with proper version pinning
• Env var generation and comment blocks for .env.local are well structured
• Post-install instructions with Convex-specific convex env set commands are helpful
• convex.config.ts and http.ts Handlebars conditionals are correct
• The test is comprehensive and checks the right things
• The polar.ts business logic (lines 1–60, ignoring the corruption) is solid

Summary

The plumbing (deps, env vars, compatibility, post-install) is solid work. The critical issues are in the template files — they need to preserve createFileRoute for tanstack-router/start, the polar.ts.hbs corruption needs to be fixed, and the buttonVariants import path needs to account for projects without a UI library package.

@Alisha-21-cloud There are lot of issues, I'm always okay with using AI to code but please review and verify your changes, if you'd like to fix all issues above - I can re-review the PR again

Thanks for the detailed review 🙌
I’ll fix these issues ASAP and push an updated commit for your review.

Fixes Completed ✅

I’ve addressed all the reported issues. Please review the changes below:

All fixes have been pushed. Please take a look when you get a chance

Will try to take a look today. Thank you