Setting any `watch` option causes vite to build in watch mode

[susnux]

Describe the bug

We need to set the allowInputInsideOutputPath watch option for rollup.
But as soon as we set anything under watch of the vite config, vite will not build but run in watch mode.
Meaning even npx vite build runs in watch mode (note the missing --watch).

Reproduction

https://stackblitz.com/edit/vitejs-vite-aozenteb?file=vite.config.js&terminal=dev

Steps to reproduce

No response

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: 20.19.1 - /usr/local/bin/node
    Yarn: 1.22.19 - /usr/local/bin/yarn
    npm: 10.8.2 - /usr/local/bin/npm
    pnpm: 8.15.6 - /usr/local/bin/pnpm
  npmPackages:
    vite: ^7.1.2 => 7.1.3

Used Package Manager

npm

Logs

No response

Validations

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• Read the Contributing Guidelines.
• Read the docs.
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• The provided reproduction is a minimal reproducible example of the bug.

[bluwy]

This is the expected behaviour as described in the docs. If build.watch is non-null the build will run in watch mode. I think you can detect and conditionally apply the option instead with process.argv or a plugin.

[susnux]

Thank you in that case it seems here is a but in vite: #20673