stryker.config.json

{
  "$schema": "./node_modules/@stryker-mutator/core/schema/stryker-schema.json",
  "_comment": "Decision-kernel mutation lane (issue #1415). The mutate list below MUST mirror KERNEL_MODULES in scripts/mutation/modules.ts — scripts/mutation/config.test.ts asserts it. The lane reports scores and never gates on them (#1457), so no `break` threshold may be set here either. Any edit changes the config content hash the report and lane envelope carry, so scores measured before and after are not comparable.",
  "packageManager": "pnpm",
  "tsconfigFile_comment": "Points at a path that does not exist on purpose. Stryker's sandbox rewrites tsconfig `extends`/`references` through the classic TypeScript API, which the repo's TypeScript 7 native package no longer exposes (`ts.parseConfigFileTextToJson is not a function`). Our tsconfig has neither extends nor references, so there is nothing to rewrite — skipping the preprocessor is exact, not a workaround for a real dependency. The behaviour relied on is that the preprocessor no-ops when the file is absent: see packages/core/src/sandbox/ts-config-preprocessor.ts (https://github.com/stryker-mutator/stryker-js/blob/master/packages/core/src/sandbox/ts-config-preprocessor.ts) and https://stryker-mutator.io/docs/stryker-js/configuration/#tsconfigfile-string. Re-check it on every Stryker upgrade: if a future version errors on a missing tsconfig instead, point this at a real, extends-free tsconfig.",
  "tsconfigFile": "tsconfig.stryker-absent.json",
  "plugins_comment": "Named explicitly: the default `@stryker-mutator/*` glob does not resolve under pnpm's non-flat node_modules, so plugin discovery finds no test runner.",
  "plugins": ["@stryker-mutator/vitest-runner"],
  "testRunner": "vitest",
  "vitest_comment": "The harness derives the related test scope once. Per-test coverage filters each mutant; repeating Vitest related discovery during every mutant adds no coverage.",
  "vitest": {
    "configFile": "vitest.mutation.config.ts",
    "related": false
  },
  "reporters": ["progress", "json"],
  "jsonReporter": {
    "fileName": ".tmp/mutation/mutation.json"
  },
  "htmlReporter": {
    "fileName": ".tmp/mutation/mutation.html"
  },
  "concurrency": 4,
  "coverageAnalysis": "perTest",
  "ignoreStatic": true,
  "tempDirName": ".tmp/stryker",
  "cleanTempDir": true,
  "dryRunTimeoutMinutes": 15,
  "timeoutMS": 20000,
  "timeoutFactor": 2,
  "thresholds": {
    "high": 90,
    "low": 70,
    "break": null
  },
  "mutate": [
    "packages/kernel/src/errors.ts",
    "packages/daemon/src/core/ref-frame.ts",
    "src/commands/interaction/runtime/settle.ts",
    "packages/capture-kit/src/snapshot/scroll-edge-state.ts",
    "packages/capture-kit/src/snapshot/scroll-edge-state/**/*.ts",
    "packages/selectors/src/**/*.ts",
    "!packages/selectors/src/**/*.test.ts",
    "!packages/selectors/src/**/*.fixtures.ts",
    "!packages/selectors/src/internal/__tests__/**",
    "packages/ad-script/src/internal/target-annotation-serde.ts",
    "packages/capture-kit/src/snapshot-occlusion.ts"
  ]
}