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feat: router adapters — React Router + Next.js routes → page components (B4)
Step 3.1. RouteNode (path/router/layout/guards) + routes-to edge in core; parser adapters for createBrowserRouter object trees and <Route> JSX trees (nested paths, index routes, pathless guard routes, inline guard wrappers, lazy route modules) and Next.js file-based routing (app router with [param]/ [...catchAll]/(group) segments and nearest layout.tsx, pages router with _app/api exclusions — gated on next.config/next dependency so plain repos with a pages/ folder don't sprout fake routes). Unresolvable pages emit flagged route nodes, never silence. Eval: routes + forbiddenRoutes checks; fixtures b4-react-router, b4-nextjs-approuter — scorecard 161/0/0. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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‎TRACKER.md‎

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## Status
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- **Current phase:** 3 — Journey graph
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- **Next step:** 3.1 — Router adapters
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- **Done:** 0.1–0.4, 1.1–1.6, 2.1–2.5
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- **Next step:** 3.2 — Action effects
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- **Done:** 0.1–0.4, 1.1–1.6, 2.1–2.5, 3.1
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- **Gates passed:** Gate 0 (CI + red-path, #5/#6) · Gate 1 (precision 1.000, recall 0.895, zero poison) · Gate 2 (C1 instance attribution 1.000 · B1 4-level handler chains · C6 store writers↔readers · A9 portals — scorecard 137/0/0, precision & recall 1.000)
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## What CodeRadar is
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## Phase 3 — Journey graph
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### [ ] 3.1 Router adapters
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### [x] 3.1 Router adapters
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**Failure modes:** B4
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**Build:** `RouteNode` (`path`, `layout`, `guards`) in core. Adapters: React Router (`createBrowserRouter` / `<Route>` trees, nested + lazy) and Next.js file-based (app + pages router). `routes-to` edges route → page-component instance tree.
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**Accept:** fixtures `b4-react-router`, `b4-nextjs-approuter` green: every golden route maps to its page component.

‎eval/fixtures/b4-nextjs-approuter/app/app/(marketing)/pricing/page.tsx‎

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export default function PricingPage() {
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return <section>Simple, transparent pricing</section>;
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}

‎eval/fixtures/b4-nextjs-approuter/app/app/dashboard/layout.tsx‎

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export default function DashboardLayout({ children }: { children: React.ReactNode }) {
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return (
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<section>
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<aside>Dashboard menu</aside>
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{children}
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</section>
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);
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}

‎eval/fixtures/b4-nextjs-approuter/app/app/dashboard/page.tsx‎

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import { useEffect, useState } from "react";
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export default function DashboardPage() {
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const [metrics, setMetrics] = useState<unknown[]>([]);
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useEffect(() => {
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fetch("/api/metrics").then((r) => r.json()).then(setMetrics);
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}, []);
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return (
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<main>
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<h2>Key metrics</h2>
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<div>{metrics.length}</div>
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</main>
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);
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}

‎eval/fixtures/b4-nextjs-approuter/app/app/docs/[...slug]/page.tsx‎

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export default function DocsPage() {
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return <article>Documentation chapter</article>;
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}

‎eval/fixtures/b4-nextjs-approuter/app/app/layout.tsx‎

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export default function RootLayout({ children }: { children: React.ReactNode }) {
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return (
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<html lang="en">
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<body>
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<header>Nimbus Analytics</header>
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{children}
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</body>
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</html>
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);
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}

‎eval/fixtures/b4-nextjs-approuter/app/app/page.tsx‎

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export default function HomePage() {
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return <h1>Your analytics at a glance</h1>;
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}

‎eval/fixtures/b4-nextjs-approuter/app/app/users/[userId]/page.tsx‎

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export default function UserProfilePage() {
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return <article>Member profile and activity</article>;
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}

‎eval/fixtures/b4-nextjs-approuter/app/next.config.mjs‎

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/** Marks this fixture as a Next.js project for router detection. */
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export default {};

‎eval/fixtures/b4-nextjs-approuter/app/pages/_app.tsx‎

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export default function MyApp({ Component, pageProps }: { Component: React.ComponentType; pageProps: Record<string, unknown> }) {
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return <Component {...pageProps} />;
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}

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