JavaScript Tooling - Practice Questions 2026

Master JavaScript Tooling: NPM, Yarn, and Webpack Practice Exams

Welcome to the definitive practice resource designed to help you master the essential ecosystem of modern JavaScript development. Whether you are preparing for a technical interview or looking to solidify your workflow efficiency, these practice exams provide a rigorous environment to test your knowledge of NPM, Yarn, and Webpack.

Why Serious Learners Choose These Practice Exams

In the rapidly evolving world of frontend development, understanding how to manage packages and bundle assets is just as important as writing the code itself. These practice tests go beyond surface-level definitions, challenging you to understand the "why" behind dependency management and build optimizations. Serious learners choose this course because it bridges the gap between theoretical knowledge and professional-grade implementation.

Course Structure

• Basics / Foundations

This section covers the fundamental command-line interfaces and the role of the package. json file. You will be tested on initializing projects, understanding semantic versioning (SemVer), and the basic differences between package managers.

Focus on the essential mechanics of dependency installation. This includes understanding the difference between dependencies and devDependencies, global versus local installations, and basic Webpack entry and output configurations.

Dive deeper into configuration files. You will tackle topics like Webpack Loaders (Babel, CSS, File loaders), Plugins, and managing lock files (package-lock. json and yarn. lock) to ensure environment consistency.

Challenge yourself with complex build optimizations. This module covers Code Splitting, Tree Shaking, Hot Module Replacement (HMR), and environment-specific configurations (Production vs. Development modes).

Apply your knowledge to solve practical problems. Questions in this section simulate common debugging tasks, such as resolving dependency conflicts, fixing broken builds, and optimizing slow bundle sizes.

A comprehensive simulation of a professional assessment. This final exam pulls from all previous sections to ensure you have a holistic grasp of JavaScript tooling and are ready for any real-world challenge.

Sample Practice Questions

QUESTION 1

Which Webpack feature is specifically designed to remove unused "dead" code from the final bundle to reduce file size?

• Option 1: Hot Module Replacement

CORRECT ANSWER

Option 2

CORRECT ANSWER EXPLANATION

Tree Shaking is a form of dead code elimination. It relies on the static structure of ES2015 module syntax (import and export) to detect which code is actually being used and excludes the rest from the final bundle.

WRONG ANSWERS EXPLANATION

• Option 1: Hot Module Replacement (HMR) exchanges, adds, or removes modules while an application is running, without a full reload. It is for development speed, not bundle size.

QUESTION 2

When using NPM or Yarn, what is the primary purpose of the lock file (e. g. , package-lock. json or yarn. lock)?

• Option 1: To list all available scripts for the project

CORRECT ANSWER

Option 4

CORRECT ANSWER EXPLANATION

Lock files record the exact version of every dependency and sub-dependency installed. This ensures that every developer on a team and the CI/CD server installs the exact same dependency tree, preventing "it works on my machine" bugs.

WRONG ANSWERS EXPLANATION

• Option 1: Scripts are defined in the scripts object within the package. json file, not the lock file.

Course Features

Welcome to the best practice exams to help you prepare for your JavaScript Tooling (NPM, Yarn, Webpack).

• You can retake the exams as many times as you want

We hope that by now you are convinced! There are a lot more questions inside the course to help you reach the next level in your career.