Fix: import namespace optimize panic with nested for of stmt #1640
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🧹 Outside diff range and nitpick comments (1)
e2e/fixtures/tree-shaking.import_namespace/src/index.tsx (1)
22-28: 代码变更符合PR目标，但有一些建议这段新增的代码成功实现了嵌套的for...of循环来遍历对象条目，符合PR的优化目标。然而，有以下几点建议：
- 对于大型对象，这种嵌套循环的时间复杂度为O(n^2)，可能会导致性能问题。
- 建议添加注释说明这段代码的具体用途（例如：测试、演示或实际功能）。
- 如果这是用于生产环境，可以考虑更高效的替代方案。
您是否需要我提供一些优化建议或替代方案的示例？
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- crates/mako/src/plugins/tree_shaking/remove_useless_stmts.rs (2 hunks)
- e2e/fixtures/tree-shaking.import_namespace/src/index.tsx (1 hunks)
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🔇 Additional comments (3)
crates/mako/src/plugins/tree_shaking/remove_useless_stmts.rs (3)
9-9: 新导入语句看起来不错。新添加的
for_of导入与现有的 ES2015 兼容性转换导入保持一致。这表明该转换将与其他 ES2015 转换一起使用，有助于提高代码的兼容性。
275-275:for_of转换的添加是个很好的改进。在
optimize_import_namespace函数中添加for_of转换是一个很好的改进。这个变更有以下几点好处：
- 它解决了 PR 目标中提到的嵌套
for of语句在导入命名空间中的问题。- 新的转换与现有的
object_rest_spread和destructuring转换配合得很好，顺序也很合理。- 这个改动可能会提高代码的兼容性，特别是在处理复杂的导入命名空间时。
建议：考虑添加一个简短的注释，解释为什么需要这个特定的转换，以便未来的开发者更容易理解这段代码的目的。
Line range hint
1-380: 总体评价：代码变更解决了特定问题，实现得当。这次的代码变更虽然很小，但很有针对性：
- 新增了
for_of转换的导入。- 在
optimize_import_namespace函数中应用了for_of转换。这些变更很好地解决了 PR 目标中提到的嵌套
for of语句在导入命名空间中的问题。实现方式与现有代码风格一致，并且没有引入明显的副作用。建议：
- 考虑添加单元测试来验证这个新功能，特别是针对嵌套
for of语句的场景。- 更新相关文档，说明这个新的优化功能。
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Codecov ReportAttention: Patch coverage is
Additional details and impacted files@@ Coverage Diff @@
## master #1640 +/- ##
==========================================
- Coverage 55.57% 55.57% -0.01%
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Files 172 172
Lines 17414 17415 +1
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Hits 9678 9678
- Misses 7736 7737 +1 ☔ View full report in Codecov by Sentry. |
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workaround first |
ref to this discuss swc-project/swc#9647
Summary by CodeRabbit
新功能
for_of转换。文档