new·The score now tells you which way it movedA brain's exam only ever grows: its own material writes questions, and so does every question a real caller asked and did not get answered. The score is a percentage over that growing set, so a brain that learned more could post a smaller number — and this week three did. One of them answered two MORE questions than the week before and showed eighteen points less. Printed as a single percentage, that reads as decline to a reader and as punishment to anyone who contributes material.all news →
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explore / Web & frontend / mozg / React Router

React Router · API

Answer questions about the React Router API exactly as specified: every component, hook and utility with its props, arguments and return type, and the framework conventions.

994 notes · updated 2026-08-15 · trained 79%

since last sitting: +30 newly passed — this brain is learning · the verified changelog →

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$ claude mcp add --transport http mozg \
https://mozg.sh/mcp --header "Authorization: Bearer …"
> use mozg/react-router-api — …
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Ask it things like

answers 30/37 on its latest exam · anti-bluff 0/1
What are the props accepted by the Outlet component?Component Props & Signatures✓
What properties are passed to a Route component via loaderData, actionData, params, and matches?Component Props & Signatures✓
What is the purpose of error boundaries in React Router and what should they NOT be used for?Error Handling✓
What file should contain your route configuration in React Router?Framework Conventions✓
What does useLoaderData return?Hooks & Navigation✓
What is the difference between using useFetcher vs Form for navigation?Hooks & Navigation✓
What does the useFetcher hook return and what state can you access from it?Hooks & Navigation✓
What is the signature of the action export function?Loaders & Actions✓

What it can answer

37 coverage checks
79%
Answers 30 of the exam's 38 questionsIt answers 30 questions, 30 more than last time, out of an exam that grew by 38.Nothing it used to answer has stopped working.
✓Error Handling4 / 4
▲Framework Conventions4 / 5
▲Hooks & Navigation4 / 5
▲Routing & Navigation4 / 5
▲Component Props & Signatures3 / 4
▲Forms & Data Handling3 / 4
▲Loaders & Actions3 / 4
▲Utilities & Helpers3 / 4
✓Router Setup & Creation2 / 2
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Attacks survived

re-run weekly · 2026-08-09
✓gate-battery12/12 known hostile payloads caught by the ingest gate
✓injection-corpusevery active note scanned — no steering language
✓secret-corpusevery active note scanned — no keys or credentials

heuristic scans against known attack classes — measured and dated, not a promise of unpoisonability

Inside

  • @react-router/architect package installation · router setup & creation
  • Architect integration with React Router · router setup & creation
  • Create a new React Router app with npm · router setup & creation
  • Motivation for dedicated react-router.config.ts file · router setup & creation
  • Vite plugin no longer accepts config options · router setup & creation
  • react-router.config.ts file location and purpose · router setup & creation
  • app/routes.ts changed to default export · framework conventions
  • react-router.config.ts uses default export · router setup & creation
  • Config APIs exported from @react-router/dev/config · router setup & creation
  • react-router.config.ts is optional but recommended · router setup & creation
  • Config changes do not trigger full dev server reloads · framework conventions
  • useLoaderData and useActionData backwards compatibility · hooks & navigation
  • useTransition backwards compatibility for Remix · hooks & navigation
  • React Router components becoming redundant in Remix · components

Licence

CC BY-NC-SA 4.0

Use it, copy it, build on it, with credit. Selling it is not allowed.