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Explain Vue as a progressive framework and build-step differences
Tests incremental adoptability. Strong answers define progressive as layer-by-layer adoption, describe script-tag HTML enhancement, and contrast it with compiled SFC SPA toolchains. Red flag: calling Vue lightweight rather than incrementally adoptable.
What out-of-the-box Angular features require manual setup in Vue or Svelte?
Tests whether you understand framework scope tradeoffs. A strong answer cites first-party routing, forms, dependency injection, and Signals, then contrasts them with Vue or Svelte's add-on ecosystem.
What is the primary end-user benefit of Svelte's compiler-first approach?
Tests if you connect compiler architecture to user-facing performance. Strong answer: build-time work shrinks bundles and reduces browser overhead for faster loads on slow devices. Red flag: answering with developer ergonomics instead of runtime performance.
Compare and contrast Vue 3 and Svelte reactivity systems
Tests runtime versus compile-time trade-offs. Contrast Vue 3 Proxy interception with Svelte compile-time assignment transforms. Vue tracks dependencies dynamically during effects; Svelte resolves them at build. Red flag: claiming both use runtime Proxies.
Why is DI central to Angular architecture versus Vue's module system?
Tests architectural grasp of inversion of control. Angular DI enables hierarchical injectors, tree-shakable providers, and runtime substitution without direct imports unlike Vue modules. Red flag: calling DI mere convenience or claiming Vue matches Angular DI.
How does Svelte update the DOM without a Virtual DOM?
This tests compile-time versus runtime framework architecture. A strong answer says Svelte compiles components into imperative JS that surgically updates the DOM when reactive state changes. A red flag is claiming it uses a hidden VDOM or dirty checking.
How would Angular vs Vue philosophies influence your large-scale architecture choice?
Tests mapping philosophy to team scale. Contrast Angular's opinionated batteries-included tooling and two-way binding with Vue's progressive incremental adoption and Composition API; pick Angular for standards or Vue for flexibility.
Svelte compiler downsides vs Vue and Angular runtime
Tests compile-time versus runtime trade-offs in large apps. Strong answers address dynamic component limits, plugin friction, build scalability, and migration cost. Red flag: claiming Svelte has no runtime or that dynamic components are impossible.
ng serve purpose and fundamental difference from ng build
Ng serve compiles in memory and serves via a dev server with live reload, while ng build writes output to dist/.
Why does create-vue ask about Pinia and Vitest during scaffolding?
Tests knowledge of Vue's lean core and modular tooling. Good answers note that create-vue conditionally installs deps, scaffolds folders like src/stores or tests/, and pre-configures Vite so you skip manual wiring.
How does src/routes determine routing in SvelteKit?
Src/routes mirrors URLs, folders become paths, [slug] creates dynamic params, and +page.svelte renders pages.
How do you configure Angular CLI dev server proxying?
Tests Angular CLI proxying to bypass CORS locally. Good answer: create proxy.conf.json with target and path, register it in angular.json serve options as proxyConfig, then restart ng serve.
Explain Vite dependency pre-bundling, startup speed, and CommonJS handling
This tests whether you understand Vite's ESM-first dev server constraints. Pre-bundling converts CJS/UMD to ESM and collapses multi-file ESM deps into single modules to stop 600+ request waterfalls.
Describe two key Angular CLI production build optimizations
Tests whether you know architect targets and concrete production optimizations. Strong answers name two of: dead code elimination and minification, hashed filenames for cache busting, or disabled source maps.
What is a SvelteKit adapter and how do adapter-static and adapter-node differ?
Tests your grasp of SvelteKit's deployment abstraction. A strong answer outlines how adapters compile the app for a target platform, contrasting adapter-static's CDN-ready HTML with adapter-node's server-side request handler for Node environments.
How would you implement lazy loading for an Angular feature module?
This tests route-level code splitting and CLI workflows. A great answer hits: ng generate module, loadChildren in the route config, and excluding the feature from AppModule. A red flag is suggesting manual chunking instead of router-driven lazy loading.
How do you configure Vite Library Mode for ESM and UMD outputs?
Tests Vite Library Mode multi-format packaging. Strong answer: build.lib entry, formats es and umd, fileName function, and rollupOptions.output.globals for Vue. Red flag: multiple configs or omitting UMD global name.
Prerendering vs SSR in SvelteKit: trade-offs?
Prerender generates static HTML at build, SSR renders on each request, prerender wins on speed but requires static data.
Design the public API for a reusable Button component
Variant, size, disabled, type props; forward click; slots for content/icons; no router/form coupling.
Primary mechanism for passing data from parent to child component
Tests unidirectional parent-to-child data flow and explicit component contracts. A strong answer names props or inputs, explains one-way binding, and warns against direct child mutation. Red flag: confusing props with global state or events.