Questions
1 of 3
1What are the entry points?
2Why would we need two multiple entry points?
3Syntax to define entry points in webpack configuration?
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01 / 03

What are the entry points?

Difficulty: 4/10
entry configuration, bundle splitting, module resolution

the 'entry point' is the starting point for building your application's JavaScript bundle. It defines which files Webpack should use as the root or main files from which it will begin its dependency analysis and build process.

there are multiple ways to define the entry property in your webpack configuration.
  1. 1

    Single Entry (Shorthand) Syntax

  2. 2

    multi-main entry syntax

  3. 3

    Object Syntax

Single Entry (The Default): Used primarily for Single Page Applications (SPAs). If you don't specify anything, Webpack defaults to ./src/index.js.
Array Entry (Multi-Main Entry) Used when you want to inject multiple independent files together into a single bundle.
Object Entry (The 'Scalable' Way) This is the most flexible approach. It allows you to create multiple bundles for different parts of your app (e.g., a 'Main' app and an 'Admin' panel).

Scenario Questions

0-2 years experience

  1. 1If you need to bundle two separate pages, `home.js` and `admin.js`, how would you configure the entry property in webpack.config.js?
  2. 2What happens if you omit the entry field entirely? What does webpack use as the default entry point?
  3. 3You added a new file `dashboard.ts` and want it to be an entry point without affecting existing bundles. How would you modify the config?

2-5 years experience

  1. 1Your team added a new entry point for a legacy admin panel, but the build size for the main bundle unexpectedly increased. What could be causing this and how would you investigate?
  2. 2During a feature rollout, the `vendor` entry point stopped being generated after you upgraded a dependency. Walk me through how you'd debug the entry configuration.
  3. 3Explain why you might choose a single entry point versus multiple entry points for a micro‑frontend architecture, and what trade‑offs you consider.

5-8 years experience

  1. 1We have a monorepo with several packages, each exposing its own entry point, and we need to generate separate bundles that share common code efficiently. How would you design the entry configuration and related plugins to minimize duplication and support code splitting?
  2. 2Our production build is hitting memory limits when processing many entry points for a large SPA. What strategies would you employ at the webpack configuration level to mitigate this?
  3. 3Describe how you would set up entry points to support hot module replacement for both client and server bundles in a universal React app.

8+ years experience

  1. 1The company is migrating from a custom build system to webpack across dozens of services. How would you establish a standardized entry point convention that balances developer ergonomics, CI performance, and long‑term maintainability?
  2. 2When introducing a new shared component library, you need to expose multiple entry points (ESM, CommonJS, UMD) while preserving tree‑shaking. What architectural decisions and webpack config patterns would you apply?
  3. 3Discuss the implications of using dynamic entry points generated at runtime for a plugin ecosystem, and how you'd ensure build stability and security.

Follow-up Questions

  • What steps would you take to verify that your entry changes produced the expected bundles?
  • How does your entry configuration affect caching and incremental builds?
  • If bundle size grows unexpectedly, what specific checks would you perform?
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