chore: fix ts error

[btea]

Description

In the current ts version(5.0.2), the initialization is not assigned, and it seems that the following errors will occur.

Additional context

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What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

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• Read the Contributing Guidelines.
• Read the Pull Request Guidelines and follow the PR Title Convention.
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• Ideally, include relevant tests that fail without this PR but pass with it.