How to Set Up Code Splitting In Webpack?

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Code splitting in webpack allows you to split your code into smaller chunks that can be loaded on demand. This can help reduce the initial bundle size of your application and improve loading times.


To set up code splitting in webpack, you first need to install the webpack SplitChunksPlugin. This plugin allows you to split your code into separate chunks based on specified criteria such as size or dependencies.


Next, you will need to configure your webpack configuration file to use the SplitChunksPlugin. You can specify the optimization.splitChunks option in your webpack configuration to set the criteria for code splitting.


For example, you can specify that code should be split into chunks larger than a certain size, or that code shared between multiple entry points should be split into a separate chunk. You can also specify other options such as the name of the output file for the split chunks.


Once you have set up code splitting in webpack, you can use dynamic imports in your code to load these split chunks on demand. This allows you to defer loading of certain parts of your application until they are needed, improving performance.


Overall, setting up code splitting in webpack can help improve the loading times of your application by reducing the initial bundle size and loading only the code that is needed for a particular page or feature.

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What is the output filename in webpack?

By default, the output filename in webpack is main.js. However, you can customize the output filename by specifying it in the webpack configuration file.


How to deal with shared modules in code splitting?

When dealing with shared modules in code splitting, there are several approaches you can take to ensure that the shared modules are efficiently loaded and used across different parts of your application:

  1. Identify common modules: Start by identifying which modules are commonly used across different parts of your application. These can include utility functions, components, or libraries that are used in multiple components or pages.
  2. Separate shared modules: Once you have identified the common modules, you can separate them into a separate bundle or chunk that can be loaded once and shared across different parts of your application. This can help reduce duplication and improve loading times.
  3. Use dynamic imports: Use dynamic imports to load shared modules only when they are needed. This can help reduce the initial bundle size and improve loading times by loading the shared modules asynchronously when they are requested.
  4. Utilize webpack's code splitting features: If you are using webpack for code splitting, you can take advantage of webpack's code splitting features to split your application into smaller chunks and load them dynamically as needed. This can help optimize the loading process and improve performance.
  5. Caching: Utilize caching mechanisms to store and retrieve shared modules to improve loading times. This can help reduce the amount of time it takes to load shared modules and improve overall performance.


By implementing these strategies, you can effectively manage shared modules in code splitting and improve the performance and efficiency of your application.


What is tree shaking in webpack?

Tree shaking is a term used in webpack to describe a process where the bundler analyzes the project's code and removes any unused code (dead code) from the final bundle. This optimization technique helps reduce the size of the bundle, resulting in faster load times and improved performance for the application. Tree shaking is typically used in conjunction with code minification and other optimization techniques to create efficient webpack bundles.


How does code splitting improve website performance?

Code splitting improves website performance by breaking up the codebase into smaller bundles or chunks, allowing for faster loading times and better resource management. By only loading the necessary code when it is needed, code splitting reduces the initial payload size and avoids loading unnecessary code, leading to quicker page loads and improved overall performance. Additionally, code splitting can help optimize caching strategies and improve the user experience by reducing the amount of time it takes for a website to render and become interactive.


What is dynamic import in webpack?

Dynamic import in webpack is a feature that allows you to import modules on-demand, rather than all at once when the application is loaded. This can help reduce the initial bundle size and improve the performance of your application by loading only the necessary modules when they are needed.


Dynamic import in webpack is achieved by using the import() function, which returns a promise that resolves to the module being imported. This can be used in combination with async/await or .then() to handle the dynamically imported module.


Overall, dynamic import in webpack provides a flexible way to code-split your application and optimize its loading performance.

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