How do I optimize Webpack bundle size?

How do I optimize Webpack bundle size?

Using Production Mode in Webpack. Running your project in production mode reduces the bundle sizes compared to the development mode. Webpack provides a separate flag ( -p ) to enable this feature and removes all the white spaces and newlines in the code.

How big should my JS bundle be?

Measure and visualize bundle size The easiest way to use it is to generate a stats file with webpack and to launch the tool with npx . To understand what the different sizes mean: Stat size is the size of the input, after webpack bundling but before optimizations like minification.

How do I find my Webpack bundle size?

There are 2 approaches to analyze bundle size using Webpack Visualizer.

1. Using Webpack Visualizer website. In this approach, all you need to do is generate a stat file using webpack — profile — json > webpack-stats.
2. Using Webpack Visualizer plugin.

How do you optimize a bundle size?

This little flag does these two things to optimize your bundle size:

1. Enable minification using TerserPlugin. It removes unnecessary white spaces, new lines, unreachable code, etc.
2. Set the NODE_ENV to production . This tells some packages, like React, to not include debug code.

Does Webpack bundle Node_modules?

Webpack allows you to define externals – modules that should not be bundled. When bundling with Webpack for the backend – you usually don’t want to bundle its node_modules dependencies. This library creates an externals function that ignores node_modules when bundling in Webpack.

How do you use Webpack-bundle-analyzer react?

json and edit the npm scripts.

1. Run npm install –save-dev webpack-bundle-analyzer to install webpack-bundle-analyzer.
2. Add a –stats flag at the end of “build” script command.
3. Add a new script called “analyze” as shown below.

How do I make my Webpack bundle smaller?

Here are some cool ways you can reduce your webpack bundle size:

1. SCOPE HOISTING. Scope hoisting uses a smarter way to add the modules to the bundle.
2. USE WEBPACK 4 IN PRODUCTION.
3. USE LODASH-WEBPACK-PLUGIN.
4. TREE SHAKING.

What is webpack bundling?

Webpack is an aggressive and powerful module bundler for JavaScript applications. It packages all the modules in your application into one or more bundles (often, just one) and serves it to the browser.

How do you bundle on a webpack?

Bundling JavaScript the Webpack way You can bundle your JavaScript using the CLI command by providing an entry file and output path. Webpack will automatically resolve all dependencies from import and require and bundle them into a single output together with your app’s script.

Does webpack bundle Node_modules?

How do you use webpack-bundle-analyzer react?

How does webpack decide to bundle?

Webpack can deal only with JavaScript to generate the bundle. Loaders take care of transform them modules into JavaScript code. We have to tell webpack what kind of files the loader will process, which directory to exclude (if needed), and the loader to use for that. All of this is included in the rules property.