Import source map URLs from Chrome DevTools traces

[canova]

Main | Deploy preview

Fixes #6189.

Chrome traces recorded with the "disabled-by-default-devtools.v8-source-rundown" category (enabled by default in the DevTools Performance panel) emit a ScriptCatchup event per parsed script that declares the script's source map URL.

This way we will be able to apply source maps to them with the "apply sourcemaps" button later on.

To test it, drag and drop the trace that I linked in the issue. Currently there is no visible changes, but you can look at the profile data from the devtools console. Execute this before and after this fix:

The profile in the issue: Trace-20260715T220108.json.gz

// this should contain correct integer values now instead of nulls.
profile.shared.sources.sourceMapURL
// and this should show proper source map relative URLs as strings
profile.shared.sources.sourceMapURL.map(s => profile.shared.stringArray[s])

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.63%. Comparing base (a909fb4) to head (54ca5ab).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6190      +/-   ##
==========================================
- Coverage   83.64%   83.63%   -0.01%     
==========================================
  Files         346      346              
  Lines       37143    37174      +31     
  Branches    10408    10431      +23     
==========================================
+ Hits        31067    31090      +23     
- Misses       5648     5656       +8     
  Partials      428      428              

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[fatadel]

Wow, really nice!