{
  "$schema": "https://stryker-mutator.io/schemas/stryker-schema.json",
  "_comment": [
    "Mutation testing for the ~8 critical modules (Task 11 — Fase 7).",
    "NIGHTLY ONLY — DO NOT run on every PR. Mutation testing is expensive:",
    "  - Each mutant requires a full test suite execution.",
    "  - The 8 modules produce ~200–500 mutants; est. 30–90 min per run.",
    "  - Wired to the 'nightly' CI job (not 'lint' or 'quality-gate').",
    "",
    "Install before running (not bundled to avoid E2E / CI bloat):",
    "  npm install --save-dev @stryker-mutator/core @stryker-mutator/vitest-runner",
    "  (or @stryker-mutator/tap-runner if using node:test natively)",
    "",
    "Run manually:",
    "  npx stryker run",
    "  npx stryker run --filePattern 'open-sse/handlers/chatCore.ts'",
    "",
    "Mutation score per module → quality-baseline.json key 'mutationScore.<module>'",
    "Direction: up (score can only improve; ratchet blocks drops — wired in INT phase)."
  ],
  "packageManager": "npm",
  "testRunner": "vitest",
  "vitest": {
    "configFile": "vitest.config.ts"
  },
  "mutate": [
    "open-sse/handlers/chatCore.ts",
    "open-sse/services/combo.ts",
    "open-sse/services/accountFallback.ts",
    "src/sse/services/auth.ts",
    "src/server/authz/routeGuard.ts",
    "open-sse/utils/error.ts",
    "open-sse/utils/publicCreds.ts",
    "src/shared/utils/circuitBreaker.ts"
  ],
  "ignorePatterns": [
    "node_modules",
    ".next",
    "dist",
    "coverage",
    "tests",
    "**/*.test.ts",
    "**/*.spec.ts",
    "**/__tests__/**"
  ],
  "reporters": ["progress", "html", "json"],
  "htmlReporter": {
    "fileName": "reports/mutation/mutation.html"
  },
  "jsonReporter": {
    "fileName": "reports/mutation/mutation.json"
  },
  "coverageAnalysis": "perTest",
  "timeoutMS": 60000,
  "timeoutFactor": 2.5,
  "concurrency": 2,
  "disableTypeChecks": true,
  "checkers": [],
  "thresholds": {
    "high": 70,
    "low": 50,
    "break": null
  },
  "tempDirName": ".stryker-tmp",
  "cleanTempDir": true
}