Migrating Existing Projects to Vite Quiz Quiz

This quiz explores essential steps and considerations when migrating existing codebases to Vite, including configuration updates, dependency handling, and troubleshooting common issues. Ideal for developers seeking best practices and to test their migration readiness for modern build tooling.

1. Understanding Configuration Changes

   When migrating a legacy project that uses a different build tool, which main configuration file does Vite expect you to define custom build or server options?

   1. vite.config.js
   2. build.config.js
   3. config.yml
   4. project.config.json

   Explanation: Vite reads its primary configuration from a file named 'vite.config.js', where you can define custom server, build, and plugin settings. 'config.yml' and 'project.config.json' are not recognized by default and would be ignored by Vite. 'build.config.js' might seem relevant but is not the standardized entry point for Vite configuration.

2. Asset Handling Adjustments

   In the migration process, if your previous tool inlined image assets below 10KB by default, which Vite property should you adjust to mimic this behavior?

   1. assetsInlineLimit
   2. inlineAssetsSize
   3. imgThreshold
   4. staticAssetBoundary

   Explanation: 'assetsInlineLimit' in Vite's config determines the file size for inlining static assets as data URIs. 'inlineAssetsSize', 'imgThreshold', and 'staticAssetBoundary' are not valid Vite configuration options; they are either incorrect names or do not exist, making 'assetsInlineLimit' the correct answer.

3. Transpilation Concerns

   If your existing project heavily relies on older syntax unsupported in modern browsers, what is the recommended approach in Vite for backwards compatibility?

   1. Only use ES6 features
   2. Set optimizeDeps to false
   3. Change the entry file to index.ts
   4. Add a legacy plugin for compatibility

   Explanation: Adding a legacy plugin enables Vite to transpile and polyfill unsupported features, ensuring compatibility. Changing the entry file or setting 'optimizeDeps' to false does not address syntax support. Restricting code to ES6 features may not ensure compatibility with older browsers, making the plugin approach preferable.

4. Dependency Optimization

   During migration, which Vite feature pre-bundles dependencies to improve startup performance for large projects with many modules?

   1. Dependency pre-bundling
   2. Tree shaking
   3. Asset chunking
   4. Module lazy loading

   Explanation: Vite's dependency pre-bundling process reduces cold start time by pre-processing and consolidating dependencies during startup. Asset chunking manages how files are split, tree shaking removes unused code, and module lazy loading delays module imports; none of these specifically address pre-bundling of dependencies.

5. Handling Environment Variables

   Which environment variable prefix is required for custom variables to be accessible in your code during runtime after migrating to Vite?

   1. APP_
   2. ENV_
   3. VITE_
   4. CUSTOM_

   Explanation: Vite only exposes environment variables prefixed with 'VITE_' in the client code, a practice that helps prevent direct exposure of sensitive variables. 'APP_', 'ENV_', and 'CUSTOM_' as prefixes will not automatically make variables accessible, potentially leading to undefined values in the code and build-time bugs.