---
title: Bundling Sheets with ParcelJS
sidebar_label: ParcelJS
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---
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[ParcelJS](https://parceljs.org/) is a module bundler.
[SheetJS](https://sheetjs.com) is a JavaScript library for reading and writing
data from spreadsheets.
This demo uses ParcelJS and SheetJS to export data. We'll explore how to bundle
SheetJS in a site using ParcelJS and how to export data to spreadsheets.
:::note
This demo was last tested on 2023 October 21 against parcel `2.10.0`
:::
## 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 RollupJS project, `import` statements
can load relevant parts of the library:
```js
import { read, utils, writeFileXLSX } from 'xlsx';
```
:::warning Parcel Bug
Errors of the form `Could not statically evaluate fs call` stem from a Parcel
bug[^1]. Upgrade to Parcel version 1.5.0 or later.
:::
## Complete Example
This demo follows the [Export Example](/docs/getting-started/examples/export).
0) Initialize a new project:
```bash
mkdir sheetjs-parceljs
cd sheetjs-parceljs
npm init -y
```
1) Save the following to `index.html`:
```html title="index.html"
SheetJS export demo
```
2) Install the SheetJS NodeJS module:
{`\
npm i --save https://cdn.sheetjs.com/xlsx-${current}/xlsx-${current}.tgz`}
{`\
pnpm install https://cdn.sheetjs.com/xlsx-${current}/xlsx-${current}.tgz`}
{`\
yarn add https://cdn.sheetjs.com/xlsx-${current}/xlsx-${current}.tgz`}
#### Development
3) Run the ParcelJS development server:
```bash
npx -y parcel@2.10.0 index.html
```
The process will print a URL:
```
Server running at http://localhost:1234
```
4) Access the URL from the previous step (typically `http://localhost:1234`) in
a web browser and click the "Click to Export!" button to generate a file.
#### Production
5) Edit `package.json` and remove the following line:
```js title="package.json (search for this line and remove)"
"main": "index.js"
```
6) Build the production site:
```bash
npx -y parcel@2.10.0 build index.html
```
The production site will be stored in the `dist` folder
7) Start a local web server and serve the `dist` folder:
```bash
npx http-server dist
```
Access the displayed URL (typically `http://localhost:8080/`) in a web browser.
Click on "Click here to export" to generate a file.
[^1]: See [Issue 523 in the Parcel issue tracker](https://github.com/parcel-bundler/parcel/pull/523#issuecomment-357486164)