fix: improve performance combining coverage on large codebases #753
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@koenvangeert Could you sign our CLA? |
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@jennifer-shehane Can I do anything else to help this move forward? |
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🎉 This PR is included in version 3.13.4 🎉 The release is available on: Your semantic-release bot 📦🚀 |
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Remove the constant reading and writing of the coverage object to disk for each test.
Keep it in memory and then write it once after each suite to get the correct report out.
We can optimise further by only writing to disk after all suites are done but the performance gains for this are a lot less.
Some measurements from the codebase I'm testing this on.
Before the change:
combineCoverage: 855.495ms
After:
combineCoverage: 295.321ms