Example with-mysql build bug

[farhankk360]

Bug report

Describe the bug

I was trying out this new example from examples/with-mysql works fine locally but when I try to build it using yarn build it throws a build time error.

Its related to this: #19452

Link to the example: https://github.com/vercel/next.js/tree/canary/examples/with-mysql

To Reproduce

1. yarn build

Expected behavior

Build to succeed eg.

yarn build
yarn run v1.22.5
$ next build
Loaded env from D:\dev-stuff\next.js\examples\with-mysql\.env.local
info  - Creating an optimized production build
info  - Compiled successfully
info  - Collecting page data
info  - Generating static pages (5/5)
info  - Finalizing page optimization
...

Screenshots

$ yarn build
yarn run v1.22.5
$ next build
Loaded env from D:\dev-stuff\next.js\examples\with-mysql\.env.local
Failed to compile.

./pages/api\get-entry.ts:10:25
Type error: Argument of type 'string | string[]' is not assignable to parameter
of type 'string'.
  Type 'string[]' is not assignable to type 'string'.

   8 |       return res.status(400).json({ message: '`id` required' })
   9 |     }
> 10 |     if (typeof parseInt(id) !== 'number') {
     |                         ^
  11 |       return res.status(400).json({ message: '`id` must be a number' })
  12 |     }
  13 |     const results = await query(
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this comm
and.

System information

• OS: Windows 10
• Browser: Chrome 86.0.4240.198 (Official Build) (64-bit)
• Version of Next.js: 10.17.0
• Deployment: yarn build

[balazsorban44]

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