fix: fallback to constructor.name when constructorName is not available

[LingyuCoder]

Summary

This PR fixes an issue where runtimeModule.constructorName may not be available in certain Rspack versions. The change adds a fallback to use runtimeModule.constructor?.name when constructorName is not present, ensuring compatibility across different Rspack versions.

The fix ensures that the plugin can correctly identify the HotModuleReplacementRuntimeModule even when the constructorName property is not directly available on the runtime module instance.

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

[gemini-code-assist]

Summary of Changes

Hello @LingyuCoder, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request resolves a compatibility issue where the runtimeModule.constructorName property might be absent in specific Rspack versions. By introducing a fallback to runtimeModule.constructor?.name, the change guarantees consistent identification of runtime modules, thereby enhancing the plugin's robustness across different Rspack environments.

Highlights

• Compatibility Fix: Implemented a fallback mechanism to use runtimeModule.constructor?.name when runtimeModule.constructorName is not available, addressing an issue with certain Rspack versions.
• Module Identification: Ensures the plugin can correctly identify the HotModuleReplacementRuntimeModule regardless of the Rspack version's property availability.

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[gemini-code-assist]

Code Review

This pull request correctly addresses an issue where runtimeModule.constructorName might not be available in some versions of Rspack by providing a fallback to runtimeModule.constructor?.name. The fix is straightforward and effective. I have one suggestion to further improve the code's robustness and clarity.