define.__VUE_OPTIONS_API__ now breaking some packages on 5.2.2

[chasegiunta]

Related plugins

• plugin-vue

• plugin-vue-jsx

Describe the bug

define.VUE_OPTIONS_API = false breaks some packages on 5.2.2, where previously it did not on 5.2.1 .

From the docs, this breakage (and risk) is potentially acceptable, but flagging due to the breaking change.

My test case was the Iconify package @iconify/vue

Reproduction

https://stackblitz.com/edit/vitejs-vite-eytuhvxr?file=vite.config.js

Steps to reproduce

• Install @iconify/vue package

• Install @vitejs/vue-plugin-vue vue package at 5.2.1

• Set define.__VUE_OPTIONS_API__ to false

• Run the vite dev server, import Iconify package and use component package.

• Observe working

• Update to @vitejs/vue-plugin-vue vue package to 5.2.2

• Observe breakage

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: 18.20.3 - /usr/local/bin/node
    Yarn: 1.22.19 - /usr/local/bin/yarn
    npm: 10.2.3 - /usr/local/bin/npm
    pnpm: 8.15.6 - /usr/local/bin/pnpm
  npmPackages:
    @vitejs/plugin-vue: ^5.2.3 => 5.2.3 
    vite: ^6.2.2 => 6.2.2

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.

[edison1105]

Set define.__VUE_OPTIONS_API__ to false will eventually be resolved to true in v5.2.1, and this issue was fixed in v5.2.2. You need to change false to true if you need to enable the options API.

the Icon using options API, so you need set define.__VUE_OPTIONS_API__ to true

[chasegiunta]

@edison1105 Understood. I do not personally use Options API in my project, but apparently the Iconify package does. If you're okay with the breaking change, feel free to close. I just wanted to report it just in case.