When my config content is array, I get a {}

[Muluk-m]

Describe the bug

It seems that the reason is that array is not supported when using defu for config merge

Reproduction

1. build.config returns an array.
2. In terminal, execute npm run dev

System Info

System:
    OS: macOS 13.3.1
    CPU: (8) x64 Apple M1 Pro
    Memory: 21.34 MB / 16.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 16.20.0 - ~/.nvm/versions/node/v16.20.0/bin/node
    Yarn: 1.22.17 - /opt/homebrew/bin/yarn
    npm: 8.19.4 - ~/.nvm/versions/node/v16.20.0/bin/npm
    pnpm: 8.15.4 - ~/.nvm/versions/node/v16.20.0/bin/pnpm
  Browsers:
    Chrome: 123.0.6312.87
    Safari: 16.4

Used Package Manager

pnpm

Validations

• [X] Follow our Code of Conduct
• [X] Read the Contributing Guide.
• [X] Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• [X] Check that this is a concrete bug. For Q&A, please open a GitHub Discussion instead.
• [X] The provided reproduction is a minimal reproducible of the bug.

[antfu]

We temporarily closed this due to the lack of enough information. We could not identify whether it was a bug or a userland misconfiguration with the given info. Please provide a minimal reproduction to reopen the issue. Thanks.

Why reproduction is required

[Muluk-m]

We temporarily closed this due to the lack of enough information. We could not identify whether it was a bug or a userland misconfiguration with the given info. Please provide a minimal reproduction to reopen the issue. Thanks.

Why reproduction is required

https://stackblitz.com/edit/stackblitz-starters-a8aypj?file=package.json Sorry, now I made a demo to illustrate my problem

[antfu]

Fixed 84bea2a57d52fa72e4da3a4b7d969106dc36b1c2