Bundle analysis and tree shaking in Vue - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is tree shaking in the context of Vue.js projects?

Tree shaking is a process that removes unused code from the final bundle, making the app smaller and faster by only including the parts of the code that are actually used.

beginner

Why is bundle analysis important in Vue.js development?

Bundle analysis helps you see what code is included in your final app bundle. It shows the size of each part so you can find and remove big or unnecessary code to improve performance.

intermediate

Which tool is commonly used for bundle analysis in Vue projects?

Webpack Bundle Analyzer is a popular tool that visualizes the size of webpack output files, helping developers understand and optimize their bundles.

intermediate

How does ES modules support tree shaking in Vue apps?

ES modules use static import/export syntax, which lets bundlers know exactly what code is used or unused. This helps bundlers remove unused parts during tree shaking.

advanced

What is a common cause of tree shaking not working properly in Vue projects?

Using CommonJS modules or dynamic imports can prevent tree shaking because bundlers cannot statically analyze which code is unused.

What does tree shaking do in a Vue.js project?

A Removes unused code from the final bundle

B Adds extra debugging information

C Increases the bundle size

D Changes the app's theme colors

Tree shaking removes unused code to reduce bundle size and improve performance.

Which tool helps visualize the size of your Vue app's bundle?

A Webpack Bundle Analyzer

B Vue Router

C Vuex

D ESLint

Webpack Bundle Analyzer shows a visual map of your bundle's contents.

Why do ES modules help with tree shaking?

A Because they support dynamic imports

B Because they use static import/export syntax

C Because they run faster in the browser

D Because they are written in JavaScript

Static import/export syntax allows bundlers to detect unused code for removal.

What can prevent tree shaking from working correctly?

A Using CSS files

B Using ES modules

C Using CommonJS modules

D Using Vue components

CommonJS modules use dynamic require calls, which bundlers cannot analyze well for tree shaking.

What is the main benefit of performing bundle analysis?

A To improve the app's color scheme

B To add new features to the app

C To change the app's layout

D To find and reduce large or unused code in the bundle

Bundle analysis helps identify code that can be optimized or removed to improve app size and speed.

Explain how tree shaking works and why it is useful in Vue.js projects.

Think about how bundlers decide what code to keep or remove.

Describe the purpose of bundle analysis and how it helps improve Vue app performance.

Imagine looking inside your app's package to see what takes up space.