feat(Popup): export useGlobalZIndex and setGlobalZIndex

[hellomrbigshot]

close #13574

[gemini-code-assist]

Summary of Changes

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This pull request introduces greater flexibility for managing the z-index of popup components by exposing dedicated utility functions. This enhancement enables developers to programmatically control the global z-index, which is crucial for ensuring correct layering and visibility of popups in complex UIs, directly from the Popup module.

Highlights

• Feature: Popup Component: Exported useGlobalZIndex and setGlobalZIndex functions from the Popup component's main index file, allowing external access to manage the global z-index for popups.

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Changelog

• packages/vant/src/popup/index.ts
  • Exported useGlobalZIndex and setGlobalZIndex from ../composables/use-global-z-index.

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[gemini-code-assist]

Code Review

This pull request exports useGlobalZIndex and setGlobalZIndex from the Popup component package. While this adds flexibility for developers to manage z-index, exporting setGlobalZIndex introduces a global mutable state. This is a potential design issue that could lead to maintainability problems in larger applications, as different parts of the code could conflict with each other. I've added a comment with a suggestion for a more robust design.

[gemini-code-assist]

While exporting useGlobalZIndex can be useful for integrating custom components with Vant's layering system, exporting setGlobalZIndex is concerning. It allows modification of a global variable from anywhere in an application, which can lead to race conditions and unpredictable behavior, especially in large-scale projects. For instance, different parts of an application could overwrite the global z-index, leading to hard-to-debug layering issues with popups.

A more robust approach for managing the base z-index would be to handle it through a centralized configuration, for example, when installing the Vant plugin:

app.use(Vant, { globalZIndex: 3000 });

This ensures that the configuration is set once and avoids accidental modifications at runtime. If dynamic changes are necessary, a solution based on Vue's provide/inject API would be safer and more aligned with Vue's reactivity principles.

Please consider an alternative design that avoids exporting a setter for a global mutable state.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.91%. Comparing base (ec5b45b) to head (cb210a9).
⚠️ Report is 212 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #13789      +/-   ##
==========================================
+ Coverage   89.60%   89.91%   +0.31%     
==========================================
  Files         257      257              
  Lines        7013     7063      +50     
  Branches     1736     1755      +19     
==========================================
+ Hits         6284     6351      +67     
+ Misses        384      375       -9     
+ Partials      345      337       -8     

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