Fix missing whatwg-url transitive dependencies for Vercel deployment

[Claude]

Vercel deployment fails with "Cannot find module '/var/task/apps/demo/node_modules/whatwg-url/index.js'" because node-file-trace doesn't bundle transitive dependencies of node-fetch@2.7.0.

Changes

• apps/demo/package.json: Added explicit devDependencies for whatwg-url@^5.0.0, tr46@^0.0.3, and webidl-conversions@^3.0.1
• apps/demo/vercel.json: Extended includeFiles pattern to bundle these modules in serverless function (200/256 chars)

Dependency Chain

@libsql/client → @libsql/hrana-client → cross-fetch@4.1.0 
  → node-fetch@2.7.0 → whatwg-url@5.0.0 
    → tr46@0.0.3, webidl-conversions@3.0.1

Vercel's bundler requires both explicit package.json entries and includeFiles patterns for transitive dependencies to ensure they're copied to /var/task during deployment.

Original prompt

Cannot find module '/var/task/apps/demo/node_modules/whatwg-url/index.js'. Please verify that the package.json has a valid "main" entry
Did you forget to add it to "dependencies" in package.json?
Node.js process exited with exit status: 1. The logs above can help with debugging the issue.
Cannot find module '/var/task/apps/demo/node_modules/whatwg-url/index.js'. Please verify that the package.json has a valid "main" entry
Did you forget to add it to "dependencies" in package.json?
Node.js process exited with exit status: 1. The logs above can help with debugging the issue.

[vercel]

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Project	Deployment	Actions	Updated (UTC)
objectql-demo	Ready	Preview, Comment	Mar 22, 2026 3:31am

1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
objectql	Ignored		Mar 22, 2026 3:31am