docs.sheetjs.com/docz/docs/03-demos/02-frontend/19-bundler/21-swcpack.md

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---
title: Bundling Sheets with SWC
sidebar_label: SWC spack
pagination_prev: demos/index
pagination_next: demos/grid/index
sidebar_position: 21
---
import current from '/version.js';
import Tabs from '@theme/Tabs';
import TabItem from '@theme/TabItem';
import CodeBlock from '@theme/CodeBlock';
SWC[^1] is a JS toolchain. SWC provides `spack` (formally called "swcpack") for
bundling scripts.
[SheetJS](https://sheetjs.com) is a JavaScript library for reading and writing
data from spreadsheets.
This demo uses `spack` and SheetJS to export data. We'll explore how to bundle
SheetJS in a site using `spack` and how to export data to spreadsheets.
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:::note pass
This demo focuses on integration details with the `spack` bundler.
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The demos follow the ["Export Tutorial"](/docs/getting-started/examples/export),
which covers SheetJS library usage in more detail.
:::
:::note Tested Deployments
This demo was tested in the following environments:
| Version | Date |
|:----------|:-----------|
| `1.2.246` | 2023-12-04 |
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:::
## Integration Details
[The "Frameworks" section](/docs/getting-started/installation/frameworks) covers
installation with Yarn and other package managers.
After installing the SheetJS module in a SWC `spack` project, `import`
statements can load relevant parts of the library.
Projects that import data will use methods such as `read`[^2] to parse workbooks
and `sheet_to_json`[^3] to generate usable data from files. As `sheet_to_json`
is part of the `utils` object, the required import is:
```js
import { read, utils } from 'xlsx';
```
Projects that export data will use methods such as `json_to_sheet`[^4] to
generate worksheets and `writeFile`[^5] to export files. As `json_to_sheet` is
part of the `utils` object, the required import is:
```js
import { utils, writeFile } from 'xlsx';
```
:::danger pass
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When this demo was tested against the `@swc/core@1.3.100`, `spack` crashed:
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```
thread '<unnamed>' panicked at 'cannot access a scoped thread local variable without calling `set` first',
```
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**This is a bug in SWC**
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Until the bug is fixed, it is strongly recommended to use `@swc/core@1.2.246`.
:::
## Complete Example
0) Initialize a new project:
```bash
mkdir sheetjs-spack
cd sheetjs-spack
npm init -y
```
1) Install the dependencies using a package manager:
<Tabs groupId="pm">
<TabItem value="npm" label="npm">
<CodeBlock language="bash">{`\
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npm i --save https://cdn.sheetjs.com/xlsx-${current}/xlsx-${current}.tgz regenerator-runtime @swc/cli @swc/core@1.2.246`}
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</CodeBlock>
</TabItem>
<TabItem value="pnpm" label="pnpm">
<CodeBlock language="bash">{`\
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pnpm install --save https://cdn.sheetjs.com/xlsx-${current}/xlsx-${current}.tgz regenerator-runtime @swc/cli @swc/core@1.2.246`}
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</CodeBlock>
</TabItem>
<TabItem value="yarn" label="Yarn" default>
<CodeBlock language="bash">{`\
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yarn add https://cdn.sheetjs.com/xlsx-${current}/xlsx-${current}.tgz regenerator-runtime @swc/cli @swc/core@1.2.246`}
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</CodeBlock>
</TabItem>
</Tabs>
:::note pass
The `regenerator-runtime` dependency is used for transpiling `fetch` and is not
required if the interface code does not use `fetch` or Promises.
:::
2) Save the following to `index.js`:
```js title="index.js"
import { utils, version, writeFileXLSX } from 'xlsx';
document.getElementById("xport").addEventListener("click", async() => {
/* fetch JSON data and parse */
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const url = "https://docs.sheetjs.com/executive.json";
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const raw_data = await (await fetch(url)).json();
/* filter for the Presidents */
const prez = raw_data.filter(row => row.terms.some(term => term.type === "prez"));
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/* sort by first presidential term */
prez.forEach(row => row.start = row.terms.find(term => term.type === "prez").start);
prez.sort((l,r) => l.start.localeCompare(r.start));
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/* flatten objects */
const rows = prez.map(row => ({
name: row.name.first + " " + row.name.last,
birthday: row.bio.birthday
}));
/* generate worksheet and workbook */
const worksheet = utils.json_to_sheet(rows);
const workbook = utils.book_new();
utils.book_append_sheet(workbook, worksheet, "Dates");
/* fix headers */
utils.sheet_add_aoa(worksheet, [["Name", "Birthday"]], { origin: "A1" });
/* calculate column width */
const max_width = rows.reduce((w, r) => Math.max(w, r.name.length), 10);
worksheet["!cols"] = [ { wch: max_width } ];
/* create an XLSX file and try to save to Presidents.xlsx */
writeFileXLSX(workbook, "Presidents.xlsx");
});
```
3) Create an `spack.config.js` config file:
```js title="spack.config.js"
module.exports = ({
entry: {
'web': __dirname + '/index.js',
},
output: {
path: __dirname + '/lib'
},
module: {},
});
```
4) Build for production:
```bash
npx spack
```
This command will create the script `lib/web.js`
5) Create a small HTML page that loads the generated script:
```html title="index.html"
<!DOCTYPE html>
<html lang="en">
<head></head>
<body>
<h1>SheetJS Presidents Demo</h1>
<button id="xport">Click here to export</button>
<script src="lib/web.js"></script>
</body>
</html>
```
6) Start a local HTTP server, then go to `http://localhost:8080/`
```bash
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npx http-server .
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```
Click on "Click here to export" to generate a file.
[^1]: See ["Bundling Configuration"](https://swc.rs/docs/configuration/bundling) in the SWC documentation for more details.
[^2]: See [`read` in "Reading Files"](/docs/api/parse-options)
[^3]: See [`sheet_to_json` in "Utilities"](/docs/api/utilities/array#array-output)
[^4]: See [`json_to_sheet` in "Utilities"](/docs/api/utilities/array#array-of-objects-input)
[^5]: See [`writeFile` in "Writing Files"](/docs/api/write-options)