docs.sheetjs.com/docz/docs/02-getting-started/01-installation/07-bun.md

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Bun	getting-started/index	getting-started/examples/index	7	summary Load NodeJS-style modules using CommonJS or ESM

import current from '/version.js'; import Tabs from '@theme/Tabs'; import TabItem from '@theme/TabItem'; import CodeBlock from '@theme/CodeBlock';

Package tarballs are available on https://cdn.sheetjs.com.

{"https://cdn.sheetjs.com/xlsx-" + current + "/xlsx-" + current + ".tgz"} is the URL for version {current}

:::caution Bun support is considered experimental.

Great open source software grows with user tests and reports. Any issues should be reported to the Bun project for further diagnosis.

:::

Installation

Tarballs can be directly installed with bun install:

{\ bun rm xlsx bun install https://cdn.sheetjs.com/xlsx-${current}/xlsx-${current}.tgz}

:::tip pass

Watch the repo or subscribe to the RSS feed to be notified when new versions are released!

:::

Vendoring

For general stability, "vendoring" modules is the recommended approach:

0. Remove any existing dependency on a project named xlsx:

bun rm xlsx

1. Download the tarball (xlsx-{current}.tgz) for the desired version. The current version is available at {"https://cdn.sheetjs.com/xlsx-" + current + "/xlsx-" + current + ".tgz"}

2. Create a vendor subfolder at the root of your project and move the tarball to that folder. Add it to your project repository.

3. Install the tarball:

{\ bun install file:vendor/xlsx-${current}.tgz}

The package will be installed and accessible as xlsx.

Usage

The package supports CommonJS require and ESM import module systems.

:::info pass

It is strongly recommended to use CommonJS in Bun.

:::

CommonJS require

By default, the module supports require and it will automatically add support for streams and file system access:

const { readFile } = require("xlsx");
const wb = readFile("pres.numbers"); // works!

:::caution pass

In the BunJS REPL, require incorrectly loads the ESM build.

:::

ESM import

When importing the library using ESM import statements, the native NodeJS modules are not loaded. They must be added manually:

import * as XLSX from 'xlsx';

/* load 'fs' for readFile and writeFile support */
import * as fs from 'fs';
XLSX.set_fs(fs);

/* load 'stream' for stream support */
import { Readable } from 'stream';
XLSX.stream.set_readable(Readable);

/* load the codepage support library for extended support with older formats  */
import * as cpexcel from 'xlsx/dist/cpexcel.full.mjs';
XLSX.set_cptable(cpexcel);

Bundling

For server-side scripts, bun build can pre-optimize dependencies. The Bun builder requires a proper package.json that includes the SheetJS dependency.

:::note Tested Deployments

This demo was last tested in the following deployments:

Architecture	BunJS	Date
darwin-x64	1.1.4	2024-04-19
win10-x64	1.1.4	2024-04-19

:::

0. Create a new project:

mkdir sheetjs-bun-dle
cd sheetjs-bun-dle
echo "{}" > package.json

:::caution pass

In PowerShell, the redirect will add the UTF16LE BOM. Bun does not currently support the encoding. The file must be resaved in UTF8 (without BOM) or ASCII.

:::

1. Install the SheetJS package tarball:

{\ bun install https://cdn.sheetjs.com/xlsx-${current}/xlsx-${current}.tgz}

2. Save the following script to SheetJSBun.js:

// highlight-next-line
import * as XLSX from 'xlsx';
// highlight-next-line
import * as fs from 'fs';
// highlight-next-line
XLSX.set_fs(fs);

/* fetch JSON data and parse */
const url = "https://sheetjs.com/data/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 = XLSX.utils.json_to_sheet(rows);
const workbook = XLSX.utils.book_new();
XLSX.utils.book_append_sheet(workbook, worksheet, "Dates");

/* fix headers */
XLSX.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 */
XLSX.writeFile(workbook, "Presidents.xlsx");

3. Bundle the script with bun build:

bun build --target=bun SheetJSBun.js --outfile=app.js

This procedure will generate app.js.

4. Remove the module artifacts and original script:

rm package.json bun.lockb SheetJSBun.js
rm -rf ./node_modules

At this point, app.js will be the only file in the project folder.

5. Run the script:

bun app.js

If the script succeeded, the file Presidents.xlsx will be created. That file can be opened in a spreadsheet editor.