Master unknown payload narrowing
Insane TypeScript arena: unknown, type guards, narrowing, and runtime validation boundaries
Log in and clear the lower tiers to unlock this mission.
Missing prerequisites: typescript-easy-type-narrowing
Webhook payloads arrive as unknown JSON and must be narrowed before use. You are working inside a TypeScript monorepo, and the arena only clears when the result is safe, deterministic, and explainable.
Learn to apply unknown, type guards, narrowing, and runtime validation boundaries in a TypeScript monorepo while explaining the invariant, safety constraints, and hidden edge cases.
- Demonstrates unknown, type guards, narrowing, and runtime validation boundaries
- Handles the visible sample and hidden edge cases
- Keeps output deterministic and explainable
- Avoids unsafe dynamic execution
Clear the route first
You can read the mission brief, but the editor, hints, tests, and submit flow stay locked until progression or plan access catches up.
Test Results
Run the visible checks when your first pass is ready.
Clear Protocol
Rewards
Mission Route
Hints
Hints are metered and logged for No Hint Hero runs.
Genie Mentor Core
Hint protocol / contextual guardrails active