Breakpoints never bind with Turbopack (Next.js) source maps: bundled source-map 0.7.4 has broken index-map support
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评估
- 难度
- 2/5
- 预计耗时
- 1-3 小时
- 新手友好度
- 68/100
- Issue 类型
- 缺陷
- 描述清晰度
- 描述清楚
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- 活跃
- 技术栈
- nextjs, typescript
- 领域
- devtools
调研方向
修复方式是升级依赖：package.json 已允许 source-map ^0.7.4 解析到 0.7.6，因此是 lockfile 锁定了旧版本。将 package-lock.json 中的 source-map 条目改为 0.7.6（例如运行 npm install source-map@^0.7.6），然后运行现有的构建和测试。不要编辑 dist/adapter.bundle.js，它是生成的输出。当 lockfile 解析到 0.7.6 且构建通过时即完成；确认断点需要一个基于 Turbopack 的 Next.js 应用。
由索引模型根据 Issue 内容生成。
描述
Summary
Breakpoints in apps built with Turbopack (Next.js dev server) stay unbound. Turbopack emits index source maps (a top-level sections array), and [email protected], the version pinned in package-lock.json, has two bugs in IndexedSourceMapConsumer that stop the adapter from computing any breakable locations. Both are fixed in [email protected].
Environment
- vscode-firefox-debug 2.15.0
- Firefox Developer Edition 158.0
- Next.js 16.3.6 (Turbopack dev server)
- macOS 26.6.2
- VS Code 1.141.0
Steps to reproduce
- Run a Next.js app with the Turbopack dev server (
next dev). - Launch it with a
"type": "firefox","request": "launch"config. - Set a breakpoint in any app source file and load the page that uses it.
Expected: the breakpoint binds.
Actual: it stays unbound. The source does load and maps to the right local path (SourcesManager: Adding source … / PathConversion: Converted url file:///…), but no getBreakpointPositionsCompressed / setBreakpoint requests are ever sent, and no error is logged.
Root cause
Both bugs are in IndexedSourceMapConsumer in [email protected]:
computeColumnSpans()is missing.getAllBreakables()callssourceMappingInfo.computeColumnSpans(), which callssourceMapConsumer.computeColumnSpansOn an index map that throwsTypeError`, which is swallowed in the ase breakpoint is never set._parseMappings()drops each mapping's source. It callsutil.computeSourceURL(section.consumer.sourceRoot, null, this._sourceMapURL)withnullinstead of the mapping's source. Every mapping is therefore attributed to the source-map URL,eachMappingnever yields a mapping for the original file, and the computed breakable ranges are empty.
[email protected] adds IndexedSourceMapConsumer#computeColumnSpans and fixes the source attribution.
Proposed fix
Bump source-map to ^0.7.6 in package.json and update package-lock.json. The current range ^0.7.4 already allows 0.7.6; only the lockfile pins 0.7.4.
Local workaround (verified)
Patching these two spots in dist/adapter.bundle.js (2.15.0) makes brrectly in Turbopack code:
-(this.sourceMapConsumer.computeColumnSpans(),this.columnSpansComputed=!0)
+("function"==typeof this.sourceMapConsumer.computeColumnSpans&&this.sourceMapConsumer.computeColumnSpans(),this.columnSpansComputed=!0)
-let a=n.computeSourceURL(e.consumer.sourceRoot,null,this._sourceMapURL);
+let a=n.computeSourceURL(e.consumer.sourceRoot,o.source,this._source
Then run Developer: Reload Window.
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