Use when creating a new SolidJS project, scaffolding a SolidStart application, or setting up project infrastructure. Prevents misconfigured Vite/TypeScript settings, wrong directory structures, and React-style project patterns. Covers Vite configuration, TypeScript setup, component directory structure, routing, state management, and testing setup. Keywords: SolidJS scaffold, SolidStart project, Vite config, tsconfig, project template, file structure, routing setup, new SolidJS project, start from scratch, create SolidJS app.
Use when reviewing generated SolidJS code, validating a SolidJS project, or checking for React pattern contamination. Prevents silent reactivity breaks from incorrect signal access, destructured props, wrong control flow, and store mutation errors. Covers signal access patterns, control flow components, props handling, store mutations, event handling, and context usage. Keywords: SolidJS review, code validation, React contamination, signal access, createSignal, Show, For, props, stores, check my SolidJS code, is this correct, review component, validate SolidJS.
Use when starting a SolidJS project, checking API availability, or looking up import paths and version compatibility. Prevents using deprecated APIs such as SolidStart 0.x patterns or pre-0.15 router cache function. Covers version matrix for SolidJS 1.x/2.x and SolidStart, import reference, ecosystem package map, and getting started guidance. Keywords: SolidJS API, version matrix, SolidStart, solid-js imports, @solidjs/router, ecosystem, Vite, what is SolidJS, getting started, which version, API reference.
Use when reasoning about SolidJS reactivity, debugging tracking issues, or understanding why components run once. Prevents React mental model contamination such as expecting re-renders, virtual DOM diffing, or stale closure patterns. Covers reactive dependency graph, tracking contexts, ownership tree, synchronous execution model, and direct DOM updates. Keywords: SolidJS reactivity, fine-grained, signals, tracking scope, ownership, createEffect, createMemo, no virtual DOM, how reactivity works, why component runs once, not like React, mental model.
Use when implementing error boundaries, Suspense loading states, or error recovery in SolidJS components. Prevents uncaught rendering errors, missing fallback UIs, and incorrect ErrorBoundary/Suspense nesting. Covers ErrorBoundary with reset, Suspense for createResource, nested boundaries, caught vs uncaught errors, and combined error/loading patterns. Keywords: ErrorBoundary, Suspense, error handling, fallback, reset, createResource, loading state, error recovery, app crashes, unhandled error, loading spinner, catch errors in component.
Use when reviewing SolidJS code for React anti-patterns or converting React components to SolidJS. Prevents destructured props, useState/useEffect habits, Array.map rendering, and all other React patterns that silently break SolidJS reactivity. Covers all 12+ contamination patterns including props destructuring, signal misuse, effect cleanup, list rendering, conditional rendering, refs, children, and navigation. Keywords: React to SolidJS, destructure props, createSignal, createEffect, For component, Show component, anti-pattern, migration, convert from React, React habits, why does my component break, coming from React.
Use when SolidJS reactivity is broken, effects are not firing, or store updates are not reflected in the UI. Prevents lost tracking from destructuring, conditional signal access, async tracking loss, and stale closures. Covers diagnostic flowcharts, solid-devtools debugging, effect tracking issues, store propagation failures, and systematic symptom-to-fix resolution. Keywords: reactivity debugging, effect not firing, store not updating, signal tracking, solid-devtools, stale closure, createEffect, UI not updating, why doesn't my UI update, signal not working, reactive value stale, nothing happens when I change state.
Use when implementing client-side routing, navigation, or URL parameter handling in SolidJS applications. Prevents incorrect router setup, misused navigation hooks, and non-lazy-loaded route bundles. Covers Router/HashRouter setup, A component, useNavigate, useParams, useSearchParams, useBeforeLeave, lazy loading, route preloading, and config-based routing. Keywords: @solidjs/router, Route, useNavigate, useParams, useSearchParams, lazy, route guard, client-side routing, add routing, page navigation, URL parameters, protected routes.