chore(useMergedState): mergedValue值的判断改成统一的hasValue

[hasnum-stack]

Summary by CodeRabbit

• 重构
  • 将合并值判断从三元表达式替换为统一的存在性检查方法，逻辑更清晰，代码更一致，维护成本更低。
  • 通过一致的判断方式减少潜在边界分支，提升稳定性与可读性。
  • 不影响任何功能、界面或交互；对现有使用场景完全兼容，用户无感知变更。

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Project	Deployment	Preview	Comments	Updated (UTC)
util	Ready	Preview	Comment	Sep 30, 2025 1:14am

[coderabbitai]

Walkthrough

在 src/hooks/useMergedState.ts 中，把合并值的判定从 value !== undefined ? value : innerValue 改为 hasValue(value) ? value : innerValue。其余关于 value、innerValue 与 postState 的逻辑保持不变，未修改导出或公共声明。

Changes

Cohort / File(s)	Summary
合并状态判定逻辑调整 src/hooks/useMergedState.ts	将三元判定从 value !== undefined ? value : innerValue 替换为 hasValue(value) ? value : innerValue；其余逻辑未变，更改不影响导出接口。

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

我在代码田里轻轻跳，
hasValue 点点头，undefined被识别到；
三元换新装，语义更明了，
内外值相依靠，状态不动摇。
咔哒一笔，小兔挥爪：合并，收好！

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title Check	✅ Passed	该标题以简洁且明确的方式描述了主要变更，即在 useMergedState 钩子中将 mergedValue 的判断改为统一使用 hasValue 方法，准确反映了本次改动的核心内容并遵循了约定俗成的 commit message 格式。
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

✨ Finishing touches

• 📝 Generate Docstrings

🧪 Generate unit tests

• Create PR with unit tests
• Post copyable unit tests in a comment

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📜 Recent review details

Configuration used: CodeRabbit UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 10c5697 and 39f5f00.

📒 Files selected for processing (1)

• src/hooks/useMergedState.ts (1 hunks)

🔇 Additional comments (1)

src/hooks/useMergedState.ts (1)

46-46: LGTM! 代码一致性改进

使用 hasValue(value) 替代直接的 value !== undefined 检查是一个很好的重构。这使得代码风格与文件中其他位置（第 33、35、63 行）保持一致，提高了可维护性。两者在语义上完全等价，不会改变任何行为。

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