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Stryker goes: 2,400 lines, two packages, a patch and an override fewer - #526
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…ide, tools and tests Its reports (about 4,700 mutants not caught, 64.6% to 68%) were closed by hand every week and no fix came from them; it cost a 131-line patch of its vitest runner to re-cut on every update, the qs override and 34 MB of packages. LOCKSTEP, which only kept its two packages together, goes with it. The hand mutation check of each fix stays. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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The owner's decision (2026-10-22), after an assessment of what the weekly mutation run gave:
@stryker-mutator/vitest-runnerto re-cut on every Vitest or Stryker update;qsoverride;Removed
stryker.config.mjs,.github/workflows/mutation-tests.ymlandtests/workflows/mutation-tests.test.sh.tools/mutation-report.mjsandtools/merge-mutation-reports.mjswith their tests, plusstrykerShards.test.mjs.patchedDependenciesentry; theqsoverride.test:mutationscript.tests/unit/helpers/stryker.mjs. The three tests that skipped themselves in Stryker's sandbox now always run.LOCKSTEP(tools/check-patched-updates.mjs,tools/recut-patch.mjs), which kept only Stryker's two packages at one version. A patched library's update now moves the library alone, and the tests use real patched libraries as their samples.strykergroup and its two ignore entries..gitignore/ESLint entries for Stryker's sandbox, and the docs' passages about it.docs/notes/workflows.mdkeeps one line saying why it went.Unit tests (2860), lint, typecheck and every workflow shell test (
tests/workflows/run.sh) are green.🤖 Generated with Claude Code