Fix fumadocs-mdx API usage in site source loader

[Copilot]

Vercel build was failing with TypeError: files.map is not a function due to incorrect fumadocs-mdx v11 API usage.

Changes

• apps/site/lib/source.ts: Replace createMDXSource() with resolveFiles() to properly convert doc collections to VirtualFile[] array

The fumadocs-mdx v11 API requires using resolveFiles() to transform collections into the format expected by the loader's source.files property:

// Before
const mdxSource = createMDXSource(docs, meta);
export const source = loader({
  baseUrl: '/docs',
  source: { files: mdxSource.files() }  // ❌ files is not callable
});

// After
export const source = loader({
  baseUrl: '/docs',
  source: { files: resolveFiles({ docs, meta }) }  // ✅ returns VirtualFile[]
});

Original prompt

fix vercel

12:52:34.032 Running build in Washington, D.C., USA (East) – iad1
12:52:34.033 Build machine configuration: 4 cores, 8 GB
12:52:34.140 Cloning github.com/objectstack-ai/objectui (Branch: main, Commit: 64cd0a8)
12:52:34.582 Cloning completed: 442.000ms
12:52:35.764 Restored build cache from previous deployment (4WSsDmnKfxa3KS44pqYeFut9SFbY)
12:52:36.233 Running "vercel build"
12:52:37.081 Vercel CLI 50.4.5
12:52:37.435 Detected pnpm-lock.yaml 9 which may be generated by pnpm@9.x or pnpm@10.x
12:52:37.435 Using pnpm@10.x based on project creation date
12:52:37.435 To use pnpm@9.x, manually opt in using corepack (https://vercel.com/docs/deployments/configure-a-build#corepack)
12:52:37.474 Installing dependencies...
12:52:38.021 Scope: all 18 workspace projects
12:52:39.186
12:52:39.282 ╭ Warning ─────────────────────────────────────────────────────────────────────╮
12:52:39.282 │ │
12:52:39.282 │ Ignored build scripts: @vscode/vsce-sign@2.0.9, esbuild@0.21.5, │
12:52:39.282 │ esbuild@0.25.12, esbuild@0.27.2, keytar@7.9.0, sharp@0.34.5. │
12:52:39.282 │ Run "pnpm approve-builds" to pick which dependencies should be allowed │
12:52:39.282 │ to run scripts. │
12:52:39.282 │ │
12:52:39.283 ╰──────────────────────────────────────────────────────────────────────────────╯
12:52:39.289 Done in 1.7s using pnpm v10.28.0
12:52:39.314 Detected Next.js version: 15.5.9
12:52:39.348 Running "pnpm run build"
12:52:39.642
12:52:39.642 > @objectui/site@0.1.0 build /vercel/path0/apps/site
12:52:39.642 > next build
12:52:39.642
12:52:40.438 ▲ Next.js 15.5.9
12:52:40.438
12:52:40.777 [MDX] updated map file in 8.132980999999972ms
12:52:40.800 Creating an optimized production build ...
12:52:46.183 ✓ Compiled successfully in 4.9s
12:52:46.186 Linting and checking validity of types ...
12:52:47.929
12:52:47.930 ⚠ The Next.js plugin was not detected in your ESLint configuration. See https://nextjs.org/docs/app/api-reference/config/eslint#migrating-existing-config
12:52:47.931 (node:138) [MODULE_TYPELESS_PACKAGE_JSON] Warning: Module type of file:///vercel/path0/eslint.config.js?mtime=1768884754468 is not specified and it doesn't parse as CommonJS.
12:52:47.931 Reparsing as ES module because module syntax was detected. This incurs a performance overhead.
12:52:47.931 To eliminate this warning, add "type": "module" to /vercel/path0/package.json.
12:52:47.931 (Use node --trace-warnings ... to show where the warning was created)
12:52:48.650
12:52:48.650 ./app/docs/[[...slug]]/page.tsx
12:52:48.650 21:29 Warning: Unexpected any. Specify a different type. @typescript-eslint/no-explicit-any
12:52:48.650 24:34 Warning: Unexpected any. Specify a different type. @typescript-eslint/no-explicit-any
12:52:48.650 24:64 Warning: Unexpected any. Specify a different type. @typescript-eslint/no-explicit-any
12:52:48.650 34:23 Warning: Fast refresh only works when a file only exports components. Use a new file to share constants or functions between components. react-refresh/only-export-components
12:52:48.651 38:23 Warning: Fast refresh only works when a file only exports components. Use a new file to share constants or functions between components. react-refresh/only-export-components
12:52:48.651
12:52:48.651 info - Need to disable some ESLint rules? Learn more here: https://nextjs.org/docs/app/api-reference/config/eslint#disabling-rules
12:52:49.447 Failed to compile.
12:52:49.448
12:52:49.448 ./lib/source.ts:10:22
12:52:49.448 Type error: This expression is not callable.
12:52:49.448 Type 'VirtualFile<{ pageData: DocOut<ZodObject<{ title: ZodString; description: ZodOptional; icon: ZodOptional; full: ZodOptional; _openapi: ZodOptional<...>; }, $strip>>; metaData: MetaOut<...>; }>[]' has no call signatures.
12:52:49.448
12:52:49.448 �[0m �[90m 8 |�[39m baseUrl�[33m:�[39m �[32m'/docs'�[39m�[33m,�[39m
12:52:49.448 �[90m 9 |�[39m source�[33m:�[39m {
12:52:49.448 �[31m�[1m>�[22m�[39m�[90m 10 |�[39m files�[33m:�[39m mdxSource�[33m.�[39mfiles()�[33m,�[39m
12:52:49.448 �[90m |�[39m �[31m�[1m^�[22m�[39m
12:52:49.449 �[90m 11 |�[39m }�[33m,�[39m
12:52:49.449 �[90m 12 |�[39m })�[33m;�[39m
12:52:49.449 �[90m 13 |�[39m�[0m
12:52:49.474 Next.js build worker exited with code: 1 and signal: null
12:52:49.518  ELIFECYCLE  Command failed with exit code 1.
12:52:49.537 Error: Command "pnpm run build" exited with 1

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[vercel]

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Project	Deployment	Review	Updated (UTC)
objectui-docs	Error		Jan 20, 2026 5:08am
objectui-site	Ready	Preview, Comment	Jan 20, 2026 5:08am

[github-actions]

✅ All checks passed!

• ✅ Type check passed
• ✅ Tests passed
• ✅ Lint check completed