xsheetjs/demos/rollup/README.md

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# Rollup
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This library has a proper ESM build that is enabled by default:
```js
import { read, utils } from 'xlsx';
```
This sample demonstrates a bundle for browser as well as for node.
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This demo uses the `import` form to expose the whole library, enabling client
code to access the library with `import XLSX from 'xlsx'`. The JS code from
the root demo was moved to a separate `app.js` script.
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## Required Plugins
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The `rollup-plugin-node-resolve` plugin is used:
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```js
import resolve from 'rollup-plugin-node-resolve';
export default {
/* ... */
plugins: [
resolve({
module: false, // <-- this library is not an ES6 module
browser: true, // <-- suppress node-specific features
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})
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],
/* ... */
};
```
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For the browser deployments, the output format is `'iife'`. For node, the
output format is `'cjs'`.
### Worker Scripts
Rollup can also bundle worker scripts! Instead of using `importScripts`, the
worker script should import the module:
```diff
-importScripts('dist/xlsx.full.min.js');
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+import * as XLSX from 'xlsx'; // or do named imports
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```
[![Analytics](https://ga-beacon.appspot.com/UA-36810333-1/SheetJS/js-xlsx?pixel)](https://github.com/SheetJS/js-xlsx)