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Quizzes > Quizzes for Business > Technology

Test Your Sass and Webpack Knowledge Quiz

Assess your CSS preprocessor and bundler skills

Difficulty: Moderate
Questions: 20
Learning OutcomesStudy Material
Colorful paper art promoting Sass and Webpack Knowledge Quiz

Ready to dive into the world of Sass and Webpack? This free Sass quiz offers a fun way to test your grasp of CSS preprocessing and module bundling. Ideal for front-end developers looking to sharpen build tool skills and refine style architecture, it challenges key concepts from variables to loaders. Feel free to tweak any question in our editor to create a custom Knowledge Assessment Quiz or team training session. Start your journey with the SASS and Webpack Knowledge Assessment and explore more quizzes to level up your code craftsmanship.

What is the correct file extension for Sass files using the SCSS syntax?
.css
.scss
.less
.sass
The SCSS syntax of Sass uses the .scss extension. The .sass extension refers to the indented syntax, while .css and .less are different stylesheet formats.
In Sass, which syntax correctly nests a child selector `.item` inside a parent `.container`?
.container .item();
.item .container { /* styles */ }
.container > .item { /* styles */ }
.container { .item { /* styles */ } }
Sass nesting allows placing a child selector inside its parent's block using braces. The other options are either plain CSS selectors or invalid Sass syntax.
Which Webpack configuration option specifies the entry point of an application?
entry
output
module
plugins
The 'entry' field in Webpack's configuration defines where the bundler starts building the dependency graph. 'output' controls the output location, while 'module' and 'plugins' configure loaders and plugins.
Which loader is used to compile Sass into CSS in a Webpack pipeline?
file-loader
css-loader
sass-loader
style-loader
The sass-loader compiles Sass or SCSS files to CSS. The css-loader resolves CSS imports, style-loader injects styles into the DOM, and file-loader handles file assets.
What Sass directive allows you to inherit properties from another selector?
@extend
@mixin
@import
@include
@extend lets one selector inherit the styles of another selector, merging their rules. Mixins (@mixin and @include) copy properties but do not merge selectors, and @import brings in external files.
What is the main purpose of the MiniCssExtractPlugin in Webpack builds?
Optimize image assets
Extract CSS into separate files
Compile Sass to CSS
Inline CSS into JavaScript bundles
MiniCssExtractPlugin extracts CSS into separate files instead of injecting it into the DOM at runtime. This improves caching and load performance for production builds.
How can you enable source maps for Sass in Webpack?
Add map:true to css-loader only
Use style-loader with sourceMap:true
Set devtool:'source-map' and enable sourceMap in sass-loader options
Configure output.sourceMapFile
You enable source maps globally via devtool and pass sourceMap:true to sass-loader. This ensures Sass-to-CSS mapping is generated correctly for debugging.
Which Sass feature provides a way to share blocks of styles with optional arguments?
Placeholders
Variables
Mixins
functions
Mixins allow you to define reusable blocks of styles that can accept arguments. Placeholders (@extend) share styles but do not accept parameters, and functions/variables serve different purposes.
In Webpack, which rule property is used to specify file matching patterns?
test
include
exclude
loader
The 'test' property in a Webpack rule defines a regular expression to match files. 'include' and 'exclude' refine matching, while 'loader' specifies which loader to use.
What effect does setting mode:'production' have on a Webpack build?
Enables optimizations like minification and tree-shaking
Runs the development server
Automatically splits code into chunks
Disables all loaders
Production mode turns on optimizations such as minification, scope hoisting, and tree-shaking to reduce bundle size. It does not disable loaders or start the dev server.
Which plugin removes unused CSS when bundling with Webpack?
HtmlWebpackPlugin
PurgeCSSPlugin
CleanWebpackPlugin
DefinePlugin
PurgeCSSPlugin scans your files to detect and remove unused CSS selectors from the final bundle. HtmlWebpackPlugin injects assets into HTML, DefinePlugin sets compile-time constants, and CleanWebpackPlugin cleans output folders.
What is the benefit of using Sass @use over @import?
Automatically minifies CSS
Runs faster during compilation
Isolates namespaces and avoids repeated imports
Generates inline source maps by default
@use loads a module only once and enforces a namespace, preventing variable and mixin name collisions. @import does not provide these safeguards and can lead to duplicate imports.
Which loader can be added before sass-loader to speed up builds by parallelizing tasks?
ts-loader
file-loader
babel-loader
thread-loader
thread-loader spawns worker threads to run loaders in parallel, reducing build times for expensive tasks like Sass compilation. Other loaders are not designed for parallelization.
Which Webpack configuration option enables code splitting for shared modules?
module.noParse
optimization.splitChunks
output.publicPath
resolve.alias
The optimization.splitChunks option controls how Webpack splits common dependencies into separate bundles. The other options configure output paths, parsing behavior, and module resolution.
When should you prefer Sass mixins over @extend for style reuse?
When you need parameterized or dynamic styles
When you want to merge selectors into one
When you have no reusable code blocks
When you aim to reduce the generated CSS size
Mixins allow passing parameters for dynamic styling, while @extend merges selectors but cannot handle arguments. Mixins are preferred when you need flexibility, even though they might generate more CSS.
Which Webpack compiler hook would you tap into to measure the start of compilation in a custom plugin?
compiler.hooks.afterEmit.tap
compiler.hooks.done.tap
compiler.hooks.compile.tap
compiler.hooks.emit.tap
The compile hook fires when Webpack begins a new compilation, making it ideal for start-time measurements. The emit and done hooks occur later in the pipeline.
How can you configure Webpack splitChunks to extract all CSS into a separate vendor chunk?
Define a cacheGroup with test:/\.css$/, chunks:'all', enforce:true
Add css-loader with options: { vendorChunk:true }
Set optimization.runtimeChunk to 'single'
Use MiniCssExtractPlugin only without splitChunks
Creating a cacheGroup that targets CSS files with chunks:'all' and enforce:true ensures CSS is bundled into its own vendor chunk. The other approaches do not correctly split CSS from JS.
Which tool integrates Sass linting within a Webpack pipeline?
eslint-loader
scss-lint-webpack-plugin
sasslint-loader
stylelint-webpack-plugin
The stylelint-webpack-plugin runs Stylelint against your Sass/SCSS files during the build. ESLint is for JavaScript, and the other options are not standard linting integrations.
Which set of Webpack optimizations is best for minimizing both JavaScript and CSS in production?
devtool:'eval', BabelPluginMinify, and css-loader minify:true
mode:'development', UglifyJsPlugin, style-loader, and CleanWebpackPlugin
mode:'production', TerserPlugin for JS, CssMinimizerPlugin, and MiniCssExtractPlugin
optimization.noEmitOnErrors, file-loader for CSS, and NamedModulesPlugin
Production mode enables built-in optimizations, TerserPlugin minifies JavaScript, CssMinimizerPlugin compresses CSS, and MiniCssExtractPlugin extracts CSS into files. This combination yields the smallest bundle sizes.
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Learning Outcomes

  1. Master Sass nesting and inheritance techniques.
  2. Apply Webpack configuration to optimize asset bundling.
  3. Analyse the impact of loaders and plugins on build speed.
  4. Demonstrate integration of Sass preprocessing with Webpack pipelines.
  5. Identify best practices for modular style sheet architecture.
  6. Evaluate optimization strategies for production builds.

Cheat Sheet

  1. Master Sass Nesting - Sass nesting lets you structure your styles just like your HTML, making your CSS feel like a well-organized family tree. It boosts readability by keeping related rules together and cuts down on repetitive selectors. Dive into the magic of nesting with this guide: SASS Nesting - GeeksforGeeks
  2. Understand Sass Inheritance with @extend - The @extend directive lets one selector borrow styles from another, so you can create a base "recipe" of styles and reuse it everywhere. This approach keeps your stylesheet DRY and consistent, and it's perfect when you want to tweak only a few details in variants. Learn how to share and inherit styles here: SASS @extend Rule - GeeksforGeeks
  3. Optimize Asset Bundling with Webpack Configuration - Tuning Webpack's optimization settings like concatenateModules and minimize can shrink and merge your files, leading to faster page loads. By smartly bundling your assets, you'll reduce HTTP requests and improve performance without breaking a sweat. Check out the full breakdown here: Optimization | webpack
  4. Analyze the Impact of Loaders and Plugins on Build Speed - Loaders and plugins give Webpack superpowers, but each addition can slow your build. Profiling your pipeline helps you spot slowdowns and trim the fat, so you only keep what you actually need. Get tips on monitoring and accelerating your build here: Performance | webpack
  5. Integrate Sass Preprocessing with Webpack Pipelines - Combine sass-loader, css-loader, and style-loader in your Webpack config to turn your Sass files into browser-ready CSS in one automated pass. This seamless setup means no more manual compilations - just write Sass and watch Webpack do the rest. Follow the step-by-step guide here: sass-loader | webpack
  6. Implement Modular Stylesheet Architecture - Breaking your CSS into bite-sized modules keeps your codebase tidy and scalable. Methodologies like BEM (Block Element Modifier) help you name classes in a way that's predictable and collision-free. Explore how to structure your styles with best practices here: BEM 101 - CSS-Tricks
  7. Evaluate Optimization Strategies for Production Builds - When you're ready to ship, techniques like code splitting and tree shaking can drastically cut bundle size by eliminating unused code and loading assets on demand. A lean production build not only speeds up your site but also wows users on slower networks. Discover production-ready tricks here: Production | webpack
  8. Utilize Sass Mixins for Reusable Styles - Mixins let you package up chunks of CSS into reusable snippets that you can include wherever you need them. This encourages consistency across your project and helps you avoid rewriting the same styles over and over. Master mixins here: @mixin - Sass Documentation
  9. Configure Webpack's SplitChunks for Code Splitting - The SplitChunksPlugin helps you carve your codebase into smaller, more manageable bundles that load when needed. By loading only the essentials upfront, you speed up initial page loads and keep users happy. See how to fine-tune SplitChunks here: SplitChunksPlugin | webpack
  10. Manage Dependencies with Webpack's Module Federation - Module Federation unlocks the ability to share code and dependencies across different applications, perfect for micro-frontend setups. It streamlines collaboration and keeps builds lean by avoiding duplicate packages. Get started with module sharing here: Module Federation | webpack
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