Contrast SvelteKit file-system routing with Vue/Angular router configs

WHAT THIS TESTS: This question probes whether you can reason about framework architecture rather than recite API docs. Interviewers want to see if you understand how routing paradigms shape codebase evolution, team onboarding, and deployment boundaries. The core tension is convention over configuration versus explicit control.

A GOOD ANSWER COVERS: Four things in order. First, the mechanical difference: SvelteKit maps src/routes directories directly to URL paths using plus-prefixed files like +page.svelte, while Vue Router and Angular Router require developers to declare route objects in code. Second, the ergonomics trade-off: SvelteKit removes route registration boilerplate and makes URL structure immediately discoverable from the folder tree, but it also means renaming a directory changes a public URL and can break deep links. Third, runtime flexibility: explicit configuration allows dynamic route registration, lazy loading with custom chunking logic, and programmatic route guards that cross multiple modules; filesystem routers typically handle these through file naming conventions or server hooks, which can scatter logic. Fourth, operational context at scale: centralized route configs act as a single source of truth for large teams auditing navigation flows, whereas filesystem routing distributes that knowledge across the directory tree, helping newcomers find pages faster but sometimes obscuring global patterns.

COMMON WRONG ANSWERS: Three red flags stand out. One, claiming SvelteKit has no configuration; directory structure is implicit configuration that constrains URL design. Two, saying explicit routers are just boilerplate without acknowledging their value for micro-frontends or plugin systems that inject routes at runtime. Three, ignoring server-side implications; SvelteKit co-locates server load functions with pages via +page.server.js, whereas Vue and Angular typically separate routing config from data fetching, which changes how you think about SSR boundaries.

LIKELY FOLLOW-UPS: The interviewer may ask how you would migrate a large Vue or Angular app to SvelteKit without breaking SEO, or how to implement cross-cutting concerns like authentication guards when they are not centralized in a router config. They might also ask about trade-offs for monorepos or module federation.

ONE CONCRETE EXAMPLE: Imagine adding a localized prefix like slash fr slash blog to every route. In Vue Router you add a single route record wrapper or navigation guard in the central config. In SvelteKit you typically restructure directories under src/routes/fr or use advanced hooks like handle to rewrite paths, which changes where developers look for routing logic and can affect static generation boundaries.

Source: svelte.dev