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Excessive memory consumption when handling large bundles without source maps

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评估

难度
2/5
预计耗时
1-3 小时
新手友好度
78/100
Issue 类型
缺陷
描述清晰度
描述清楚
活跃度
冷清
领域
devtools

调研方向

从 source-map-support.js 中的 retrieveFile() 和 retrieveSourceMapURL() 开始,然后跟踪 issue 中描述的 mapSourcePosition() 缓存路径。使用一个没有 source map 的大型 bundle 重现查找,并验证查找失败后其内容没有保留在 fileContentsCache 中。

由索引模型根据 Issue 内容生成。

描述

Environment:

  • Node.js with source-map-support
  • several large JavaScript bundles (5–7 MB each)
  • no source maps available for the bundles

Problem:

When an error is thrown in a large bundle, the source-map-support library unnecessarily retains the full file contents in memory. The file is loaded solely to check for a source map, but its contents are cached even after this one‑time operation. This results in excessive memory usage, especially problematic with multiple large bundles.

Steps to reproduce:

  1. An error is thrown in a bundle (e.g., index.js)
  2. Error.prepareStackTrace() is called
  3. The call chain proceeds as follows: wrapCallSite() → mapSourcePosition() → retrieveSourceMap("index.js") → retrieveSourceMapURL("index.js") → retrieveFile("index.js")
  4. The default retrieveFile handler loads the entire index.js file from disk and stores it in the fileContentsCache (source)
  5. retrieveSourceMapURL() fails to find a source map for the file
  6. mapSourcePosition() stores an empty source map in its internal cache (source)
  7. The full contents of index.js remain in the fileContentsCache indefinitely, consuming memory

Expected behavior:

File contents should be used only once to check for the presence of a source map, and then either not cached at all or discarded immediately after the check. There is no need to retain large bundle files in memory after this operation.

Actual behavior:

Large bundle files (5–7 MB) are retained in the fileContentsCache after the first error, leading to unnecessary increase in memory footprint.

Proposed solution:

Avoid caching when no source map is found: skip storing file contents in fileContentsCache if the source map lookup fails.

主要语言
JavaScript
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派生
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PR 合并指标
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从这里开始

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  2. 在 Issue 下留言说明你要接手 —— 这能避免两个人做同样的事。
  3. Fork 仓库,在一个分支上完成修改。
  4. 提交 Pull Request,并在描述里引用这个 Issue 编号。

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