Prepare for your next Vite interview with these 30 carefully curated questions and answers. This guide covers Vite concepts from basic to advanced, perfect for freshers, developers with 1-3 years experience, and those with 3-6 years in frontend development. Each question includes practical examples and code snippets ready for production use.
Basic Vite Interview Questions
1. What is Vite?
Vite is a modern frontend build tool and development server that provides fast development experience through native ES modules and optimized production builds.
2. How does Vite achieve its speed advantage during development?
Vite uses native ES modules in development. The browser loads and executes modules on demand, eliminating the need for a large upfront bundle. This combined with optimized HMR makes development much faster.
3. What is Hot Module Replacement (HMR) in Vite?
HMR allows updating only the changed parts of the application without requiring a full page reload. Vite patches existing modules in the browser’s memory for near-instant updates.
4. What is the difference between Vite’s dev server and build process?
Vite’s dev server uses native ES modules for speed and HMR. The build process uses Rollup to create optimized bundles with minification, code splitting, and tree-shaking.
5. What is dependency pre-bundling in Vite?
Vite pre-bundles certain dependencies to improve initial load time. These dependencies are bundled ahead of time, optimizing the startup speed of the development server.
6. How do you create a new Vite project?
Use the Vite create command:
npm create vite@latest my-vite-app -- --template react
cd my-vite-app
npm install
npm run dev7. What file formats does Vite serve during development?
Vite serves native ESM .js, .ts, .jsx, .tsx, .vue, and .svelte files directly to the browser without bundling during development.
8. What port does Vite use by default for the dev server?
Vite runs on port 5173 by default. You can configure this in the vite.config.js file using the server.port option.
9. How do you configure the base URL in Vite?
Set the base property in vite.config.js:
export default {
base: '/my-app/'
}10. What are Vite plugins?
Vite plugins are modules that extend Vite’s functionality. They can add new features, transform code, or modify the build process.
Intermediate Vite Interview Questions
11. Explain the role of Rollup in Vite’s build process.
Rollup is the bundler Vite uses for production builds. It handles code bundling, minification, tree-shaking, and creates optimized output bundles.
12. How do you implement code splitting in Vite?
Vite handles code splitting automatically, but you can enhance it using dynamic imports:
const MyComponent = defineAsyncComponent(() => import('./MyComponent.vue'))
13. How would you configure environment variables in Vite?
Create .env files and access via import.meta.env:
// .env
VITE_API_URL=https://api.example.com
// In component
const apiUrl = import.meta.env.VITE_API_URL14. What is Vite’s architecture?
Vite’s architecture consists of a dev server using native ES modules and a production build process using Rollup. It includes a plugin system for extensibility.
15. How do you add custom server middleware in Vite?
Use the configureServer hook in a plugin:
export default function myPlugin() {
return {
configureServer(server) {
server.middlewares.use('/api', (req, res) => {
res.end('Hello from middleware!')
})
}
}
}16. How do you optimize images in a Vite project at Salesforce?
Configure image optimization in vite.config.js using plugins like vite-plugin-image-optimizer:
import imageOptimizer from 'vite-plugin-image-optimizer'
export default {
plugins: [imageOptimizer()]
}17. What are some common Vite performance considerations?
Minimize large dependencies, optimize images, use code splitting, and ensure efficient build processes. Monitor bundle size using vite-bundle-analyzer.
18. How do you set up proxying in Vite for API calls?
Configure server.proxy in vite.config.js:
export default {
server: {
proxy: {
'/api': 'http://localhost:3000'
}
}
}19. How do you handle CSS preprocessing in Vite?
Vite supports Sass, Less, and Stylus out of the box. Install the preprocessor and import .scss/.less files directly:
npm install -D sass
@import './styles/main.scss'20. What is the purpose of vite.config.js?
vite.config.js is the central configuration file for defining plugins, server options, build settings, and optimization rules.
Advanced Vite Interview Questions
21. How would you implement SSR with Vite at Atlassian?
Use Vite’s SSR plugins and configure ssrLoadModule:
export default {
ssr: {
noExternal: ['my-lib']
}
}22. Explain Vite’s plugin API hooks.
Vite plugins use hooks like resolveId, load, transform, configureServer, configurePreviewServer, and buildStart for different lifecycle phases.
23. How do you create a custom Vite plugin?
Define an object with hook functions:
export default function myPlugin() {
return {
name: 'my-plugin',
transform(code, id) {
if (id.endsWith('.js')) {
return code.replace('console.log', 'console.debug')
}
}
}
}24. How would you optimize a large Vite application for production at Adobe?
Enable build.rollupOptions.manualChunks, use externalizeDepsInDev, implement lazy loading, and analyze bundles with rollup-plugin-visualizer.
25. What security best practices should you follow in Vite applications?
Use HTTPS, sanitize inputs, keep dependencies updated, configure CSP headers, and avoid eval in production builds.
26. How do you configure Vite for library mode?
Set build.lib in vite.config.js:
export default {
build: {
lib: {
entry: 'src/index.js',
name: 'MyLib',
fileName: 'my-lib'
},
rollupOptions: {
external: ['vue']
}
}
}27. How do you implement PWA features with Vite at Swiggy?
Use vite-plugin-pwa:
import { VitePWA } from 'vite-plugin-pwa'
export default {
plugins: [VitePWA({
registerType: 'autoUpdate'
})]
}28. Explain Vite’s module resolution strategy.
Vite resolves modules using Node.js resolution algorithm, then applies plugins, supports aliases, and handles pre-bundled dependencies.
29. How do you debug HMR issues in Vite?
Enable debug logging with VITE_HMR_DEBUG=true, check browser console for module errors, verify import paths, and use –force flag.
30. How would you set up a monorepo with Vite at Paytm?
Use Vite workspaces configuration:
export default {
build: {
rollupOptions: {
external: ['@myorg/ui']
}
},
optimizeDeps: {
include: ['@myorg/ui']
}
}## Related Vite Resources
