Error logged to console when using manualChunkSplitting and function is used.

[jafin]

Describe the bug

Setup

When you configure vite with splitVendorChunkPlugin()
and configure rollupOptions output manualChunks with a function.

 build: {
        rollupOptions: {
            output: {
                manualChunks: manualChunksFn,
            },
        },
}

function manualChunksFn(id: string) {
// chunklogic
}

Expected:

No console warning about using a function for manualChunks

Actual

Warning logged to console

"(!) the `splitVendorChunk` plugin doesn't have any effect when using the object form of `build.rollupOptions.manualChunks`. Consider using the function form instead.",

This was introduced via #13431
And I believe it just needs an else around the warning to correct.

Reproduction

https://stackblitz.com/edit/vitejs-vite-2epesn?file=vite.config.ts

Steps to reproduce

run npm run build
note output in console logs

docs(chunkSplitting): add manualChunks object form syntax warning when it is used with the splitVendorChunk plugin #13431

System Info

System:
    OS: Linux 5.0 undefined
    CPU: (8) x64 Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz
    Memory: 0 Bytes / 0 Bytes
    Shell: 1.0 - /bin/jsh
  Binaries:
    Node: 16.20.0 - /usr/local/bin/node
    Yarn: 1.22.19 - /usr/local/bin/yarn
    npm: 9.4.2 - /usr/local/bin/npm
    pnpm: 8.6.3 - /usr/local/bin/pnpm
  npmPackages:
    vite: ^4.4.2 => 4.4.3

Used Package Manager

npm

Logs

No response

Validations

• Follow our Code of Conduct
• Read the Contributing Guidelines.
• Read the docs.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• Make sure this is a Vite issue and not a framework-specific issue. For example, if it's a Vue SFC related bug, it should likely be reported to vuejs/core instead.
• Check that this is a concrete bug. For Q&A open a GitHub Discussion or join our Discord Chat Server.
• The provided reproduction is a minimal reproducible example of the bug.

[stackblitz]

Start a new pull request in StackBlitz Codeflow.

• vitejs-vite-2epesn (Open reproduction)