1 | [npm]: https://img.shields.io/npm/v/@rollup/plugin-esm-shim
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2 | [npm-url]: https://www.npmjs.com/package/@rollup/plugin-esm-shim
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3 | [size]: https://packagephobia.now.sh/badge?p=@rollup/plugin-esm-shim
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4 | [size-url]: https://packagephobia.now.sh/result?p=@rollup/plugin-esm-shim
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5 |
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6 | [![npm][npm]][npm-url]
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7 | [![size][size]][size-url]
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8 | [![libera manifesto](https://img.shields.io/badge/libera-manifesto-lightgrey.svg)](https://liberamanifesto.com)
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9 |
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10 | # @rollup/plugin-esm-shim
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11 |
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12 | 🍣 A Rollup plugin to replace CJS global variables within esm output bundles.
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13 |
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14 | The list of global variables that are shimmed are:
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15 |
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16 | - `__filename`: This variable corresponds to the file path of the generated bundle file.
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17 | - `__dirname`: This variable corresponds to the folder path of the created bundle file.
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18 | - `require`: Corresponds to a function to import modules in a synchronous way.
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19 |
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20 | ## Requirements
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21 |
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22 | This plugin requires an [LTS](https://github.com/nodejs/Release) Node version (v14.0.0+) and Rollup v2.0+.
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23 |
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24 | ## Install
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25 |
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26 | Using npm:
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27 |
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28 | ```console
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29 | npm install @rollup/plugin-esm-shim --save-dev
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30 | ```
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31 |
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32 | ## Usage
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33 |
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34 | Create a `rollup.config.js` [configuration file](https://www.rollupjs.org/guide/en/#configuration-files) and import the plugin:
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35 |
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36 | ```typescript
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37 | import esmShim from '@rollup/plugin-esm-shim';
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38 |
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39 | export default {
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40 | input: 'src/index.js',
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41 | output: {
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42 | dir: 'output',
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43 | format: 'cjs'
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44 | },
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45 | plugins: [esmShim()]
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46 | };
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47 | ```
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48 |
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49 | Then call `rollup` either via the [CLI](https://www.rollupjs.org/guide/en/#command-line-reference) or the [API](https://www.rollupjs.org/guide/en/#javascript-api).
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50 |
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51 | ## Meta
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52 |
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53 | [CONTRIBUTING](/.github/CONTRIBUTING.md)
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54 |
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55 | [LICENSE (MIT)](/LICENSE)
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56 |
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57 | Portions of this code were used with permission from [unbuild](https://github.com/unjs/unbuild). [unbuild LICENSE](./unbuild.LICENSE)
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