perf(coverage-v8): optimize V8 AST coverage conversion#1490
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Summary
This PR improves V8 coverage conversion performance for bundled Rstest workloads. It replaces the generic
ast-v8-to-istanbulruntime path with a local converter tailored for Rstest, filters raw V8 entries before source lookup/conversion, and keeps sourcemap remapping behavior for bundled assets.Benchmark command in
/Users/bytedance/Desktop/projects/rsbuild:pnpm test --coverage --coverage.provider=v8ast-v8-to-istanbul)trace-2026-06-30T07-27-13-436trace-2026-06-30T07-31-08-298trace-2026-06-30T07-27-27-444Compared with baseline, the final version reduces wall span by 70.1% (3.34x faster) and phase sum by 82.9% (5.85x faster).
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