Stack Trace JS Probe

Return only:

LANGUAGE_PROBE: javascript-typescript
CHECKS:
  - <async boundary / undefined property / JSON parsing / module-resolution check>
  - <TypeScript type-contract check if .ts/.tsx appears>
REPRODUCER:
  - <minimal node/npm/vitest/jest/ts-node reproduction command or snippet>
PATCH_TARGETS:
  - <optional chaining / schema validation / discriminated union / error wrapping target>
VERIFY:
  - <npm test/vitest/jest/tsc command>