1 | # webpack-analyze-duplication-plugin [![Latest version](https://badgen.net/npm/v/webpack-analyze-duplication-plugin)](https://npm.im/webpack-analyze-duplication-plugin) [![Monthly downloads](https://badgen.net/npm/dm/webpack-analyze-duplication-plugin)](https://npm.im/webpack-analyze-duplication-plugin) [![Install size](https://packagephobia.now.sh/badge?p=webpack-analyze-duplication-plugin)](https://packagephobia.now.sh/result?p=webpack-analyze-duplication-plugin)
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2 |
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3 | Detect duplicated modules in your Webpack build.
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4 |
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5 | Produce a `duplication-report.json` that contains a full-report on duplicated modules.
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6 |
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7 | Example snippet:
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8 | ```json5
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9 | [
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10 | {
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11 | // The duplicated module path
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12 | "module": "/node_modules/vue/dist/vue.esm.js",
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13 |
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14 | // Size of module
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15 | "size": "326.4 kB",
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16 |
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17 | // Size savings if de-duped
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18 | "potential-size-savings": "979.2 kB",
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19 |
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20 | // Chunks the module is duplicated in
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21 | "included-in": [
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22 | ["index.js"],
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23 | ["some-file.js"],
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24 | ...
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25 | ],
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26 | },
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27 |
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28 | ...
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29 | ]
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30 | ```
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31 |
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32 | <sub>If you like this project, please star it & [follow me](https://github.com/privatenumber) to see what other cool projects I'm working on! ❤️</sub>
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33 |
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34 | ## 🙋♂️ Why?
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35 | Webpack configuration is complicated. It's easy to overlook misconfigurations and bloated distribution bundles.
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36 |
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37 | Use this plugin to make sure there are no duplicated modules, or that they're only duplicated where you want them to be.
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38 |
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39 | ## 🚀 Install
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40 | ```sh
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41 | npm i -D webpack-analyze-duplication-plugin
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42 | ```
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43 |
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44 | ## 🚦 Quick Setup
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45 | Add to your `webpack.config.js`:
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46 |
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47 | ```diff
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48 | + const AnalyzeDuplicationPlugin = require('webpack-analyze-duplication-plugin')
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49 |
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50 | module.exports = {
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51 | ...
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52 |
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53 | plugins: [
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54 | + new AnalyzeDuplicationPlugin()
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55 | ]
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56 | }
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57 | ```
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58 |
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59 | ## 👨👩👦👦 Related
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60 |
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61 | - [webpack-distsize](https://github.com/privatenumber/webpack-distsize) - Track Webpack output size via version control
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62 | - [webpack-dependency-size](https://github.com/privatenumber/webpack-dependency-size) - Webpack plugin to get an overview of bundled dependencies and their size
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