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radar/2017-10-01/webpack.md
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title: "Webpack"
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ring: trial
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quadrant: tools
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---
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[Webpack](https://webpack.js.org/) is a web bundler for JavaScript applications. Instead of writing scripts to build and bundle your app like you would with [Gulp](/tools/gulp.html), you just define what files you want to load into your bundle.
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In the following example, we define that JavaScript files should be handled by babel-loader, excluding the files from node_modules. The logic behind the process comes from the [loader](https://webpack.js.org/concepts/loaders/). You can find the right loader in [npm](https://www.npmjs.com/search?q=loader%20webpack&page=1&ranking=optimal).
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```
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{
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test: /\.js$/,
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loader: 'babel-loader',
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exclude: /node_modules/,
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}
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```
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On top of that you can use [plugins](https://webpack.js.org/plugins/) to optimize your bundle like uglifying your code or put your common libraries in a separate file.
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Under the hood, you've got nice features such as:
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- [tree shaking](https://webpack.js.org/guides/tree-shaking/) to just bundle the features from a library you need
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- [chunk splitting](https://webpack.js.org/guides/code-splitting/) to split your code to manage the load prioritization
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The configuration is simple and there is excellent and extensive [documentation](https://webpack.js.org/configuration/).
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