Interview Questions
SvelteKit provides file-based routing where files in the routes directory automatically become pages. URLs correspond to file paths. Supports dynamic routes, nested layouts, and route parameters.
Create a route by adding a +page.svelte file in the routes directory. Example: src/routes/about/+page.svelte becomes '/about'. File structure mirrors URL structure.
Dynamic routes use square brackets in file names. Example: [slug]/+page.svelte creates dynamic segment. Parameters available through page store. Support multiple dynamic segments.
Route parameters accessed through page.params. Example: export let data; const { slug } = data. Available in +page.svelte and +page.server.js files.
Layout files (+layout.svelte) provide shared UI for multiple routes. Define common elements like navigation, footer. Support nested layouts. Content injected via <slot>.
Navigation uses <a> tags or programmatic goto function. SvelteKit handles client-side navigation. Supports prefetching with data attribute. Maintains scroll position.
Route groups organize routes using (group) syntax. Don't affect URL structure. Share layouts within groups. Support multiple groups. Help organize large applications.
Data loading uses +page.js or +page.server.js files. Export load function for data fetching. Returns props for page component. Supports server-side loading.
Error page (+error.svelte) handles route errors. Displays when errors occur. Access error details through error prop. Support custom error handling.
Redirects use redirect function from @sveltejs/kit. Can redirect in load functions or actions. Support temporary/permanent redirects. Handle authentication redirects.
Route guards protect routes using load functions. Check authentication/authorization. Return redirect for unauthorized access. Support async checks.
Nested layouts use multiple +layout.svelte files. Each level adds layout. Support layout inheritance. Handle layout data. Share layout between routes.
Preloading uses data-sveltekit-preload attribute. Fetches data before navigation. Support hover preloading. Handle preload strategies. Optimize performance.
Route transitions use page transitions API. Support enter/leave animations. Handle transition lifecycle. Implement custom transitions. Manage transition state.
Route middleware uses hooks.server.js file. Handle request/response. Support authentication. Implement custom logic. Manage middleware chain.
Route caching implements caching strategies. Handle data caching. Support page caching. Implement cache invalidation. Manage cache lifecycle.
Route validation handles parameter validation. Support request validation. Implement validation rules. Handle validation errors. Manage validation state.
Route state management uses stores or context. Handle state persistence. Support state sharing. Implement state updates. Manage state lifecycle.
Route optimization includes code splitting, preloading. Handle lazy loading. Support route prioritization. Implement performance monitoring.
Advanced patterns include nested routes, parallel routes. Handle complex navigation. Support route composition. Implement routing strategies.
Route i18n supports multiple languages. Handle URL localization. Support language switching. Implement i18n patterns. Manage translations.
Route testing verifies routing behavior. Handle navigation testing. Support integration testing. Implement test utilities. Manage test coverage.
Route monitoring tracks navigation patterns. Handle analytics integration. Support performance tracking. Implement monitoring tools. Manage monitoring data.
Route security prevents unauthorized access. Handle authentication flows. Support authorization rules. Implement security measures. Manage security policies.
Route documentation describes routing structure. Generate documentation automatically. Support example routes. Manage documentation updates. Handle versioning.
Route debugging tracks routing issues. Handle debugging tools. Support state inspection. Implement debug logging. Manage debug output.
Route accessibility ensures accessible navigation. Handle focus management. Support screen readers. Implement a11y patterns. Manage announcements.
Error handling manages routing errors. Handle error boundaries. Support error recovery. Implement error logging. Manage error state.
Code splitting optimizes route loading. Handle chunk generation. Support dynamic imports. Implement splitting strategies. Manage bundle size.