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Rspack is a fast module bundler for JavaScript.
SheetJS is a JavaScript library for reading and writing data from spreadsheets.
This demo uses Rspack and SheetJS to export data. We'll explore how to add SheetJS to a site using Rspack and how to export data to spreadsheets.
:::note pass
This demo focuses on integration details with the Rspack bundler.
The demos follow the "Export Tutorial", which covers SheetJS library usage in more detail.
:::
:::note Tested Deployments
This demo was tested in the following environments:
| Rspack | Date |
|---|---|
1.6.3 |
2025-11-15 |
:::
Integration Details
The "Frameworks" section covers installation with Yarn and other package managers.
After installing the SheetJS module in a Rspack project, import statements can
load relevant parts of the library.
Projects that import data will use methods such as read1 to parse workbooks
and sheet_to_json2 to generate usable data from files. As sheet_to_json
is part of the utils object, the required import is:
import { read, utils } from 'xlsx';
Projects that export data will use methods such as json_to_sheet3 to
generate worksheets and writeFile4 to export files. As json_to_sheet is
part of the utils object, the required import is:
import { utils, writeFile } from 'xlsx';
Complete Example
This demo follows the Export Example.
- Initialize a new project:
mkdir sheetjs-rspack
cd sheetjs-rspack
npm init -y
- Install the dependencies using a package manager:
- Save the following to
src/index.js:
import { utils, writeFileXLSX } from 'xlsx';
document.getElementById("xport").addEventListener("click", async() => {
/* fetch JSON data and parse */
const url = "https://docs.sheetjs.com/executive.json";
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"));
/* 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));
/* 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");
});
- Create bundle:
npx -p @rspack/cli rspack build
:::caution pass
This build may fail with a module error:
ERROR in ./src/index.js
× Module parse failed:
╰─▶ × JavaScript parse error: 'import', and 'export' cannot be used outside of module code
Some versions of the npm tool create package.json files with the option
"type": "commonjs". Rspack will fail if that option is specified. Edit
package.json and remove the property:
"license": "ISC",
// highlight-next-line
"type": "commonjs",
"dependencies": {
:::
This command will create the script dist/main.js
- Create a small HTML page that loads the generated script:
<!DOCTYPE html>
<html lang="en">
<head></head>
<body>
<h1>SheetJS Presidents Demo</h1>
<button id="xport">Click here to export</button>
<script src="dist/main.js"></script>
</body>
</html>
- Start a local HTTP server:
npx -y http-server .
Access the displayed URL (typically http://localhost:8080) with a web browser.
Click the "Click here to export" button to generate Presidents.xlsx