feat: refine type for CollectionQueryBuilder.first() method

[MellKam]

🔗 Linked issue

resolves #3264

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

[pkg-pr-new]

npm i https://pkg.pr.new/@nuxt/content@3265

commit: 867eb7c

[MellKam]

I tried running test:types script, but it fails with numerous errors unrelated to this PR.

Found 95 errors in 23 files.
   3  ../src/runtime/app.ts:19
     2  ../src/runtime/internal/api.ts:9
     6  ../src/runtime/internal/database.client.ts:16
    13  ../src/runtime/internal/database.server.ts:10
     1  ../src/runtime/internal/navigation.ts:103
     2  ../src/runtime/internal/query.ts:133
     2  ../src/runtime/internal/search.ts:5
     1  ../src/runtime/internal/surround.ts:3
     2  ../src/runtime/nitro.ts: on type '{ hackernews: string; content: string; data: string; p

content/tsconfig.json

Line 15 in 29f4b3e

"strictNullChecks": false,

If you enable strictNullChecks, you will see even more errors. I’m not sure why this option was disabled, as it allows for a lot of potential issues.

[farnabaz]

Thanks 👍