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---
title: Bundling Sheets with ESBuild
sidebar_label: ESBuild
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---
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[ESBuild ](https://esbuild.github.io/ ) is a fast module bundler for JavaScript.
It combines scripts and libraries into simple scripts for browsers and NodeJS.
[SheetJS ](https://sheetjs.com ) is a JavaScript library for reading and writing
data from spreadsheets.
This demo uses ESBuild and SheetJS to export data. We'll explore two workflows:
- ["Browser" ](#browser ) explores how to import SheetJS libraries in a script and
bundle with ESBuild for browser use.
- ["NodeJS" ](#nodejs ) explores how to import SheetJS libraries in a script and
bundle with ESBuild for NodeJS use.
2023-10-21 11:15:28 +00:00
:::note pass
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This demo focuses on integration details with the ESBuild bundler.
The demos follow the ["Export Tutorial" ](/docs/getting-started/examples/export ).
The tutorial covers SheetJS library usage.
:::
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:::info pass
The [ESBuild section of the Content demo ](/docs/demos/static/esbuild ) covers
loaders. They are ideal for static sites pulling data from sheets at build time.
:::
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:::note
This demo was last tested on 2023 October 19 against esbuild `0.19.5`
:::
## Integration Details
[The "Frameworks" section ](/docs/getting-started/installation/frameworks ) covers
installation with Yarn and other package managers.
## Browser
ESBuild will bundle the SheetJS ECMAScript Module build:
```js
import { read, utils, writeFileXLSX } from 'xlsx';
```
:::note pass
The `xlsx.mjs` source file uses a subset of ES6 that `esbuild` understands and
is able to transpile for older browsers.
:::
Assuming the primary source file is `in.js` , the following command will bundle
the script and generate `out.js` :
```bash
npx -y esbuild@0.19.5 in.js --bundle --outfile=out.js
```
### Browser Demo
0) Prepare a blank project:
```bash
mkdir sheetjs-esbrowser
cd sheetjs-esbrowser
npm init -y
```
1) Install the tarball using a package manager:
< Tabs groupId = "pm" >
< TabItem value = "npm" label = "npm" >
< CodeBlock language = "bash" > {`\
npm i --save https://cdn.sheetjs.com/xlsx-${current}/xlsx-${current}.tgz`}
< / CodeBlock >
< / TabItem >
< TabItem value = "pnpm" label = "pnpm" >
< CodeBlock language = "bash" > {`\
pnpm install https://cdn.sheetjs.com/xlsx-${current}/xlsx-${current}.tgz`}
< / CodeBlock >
< / TabItem >
< TabItem value = "yarn" label = "Yarn" default >
< CodeBlock language = "bash" > {`\
yarn add https://cdn.sheetjs.com/xlsx-${current}/xlsx-${current}.tgz`}
< / CodeBlock >
< / TabItem >
< / Tabs >
2) Download [`esbrowser.js` ](pathname:///esbuild/esbrowser.js ) and move to the
project folder:
```bash
curl -LO https://docs.sheetjs.com/esbuild/esbrowser.js
```
3) Create a small HTML page that loads the script. Save to `index.html` :
```html title="index.html"
< body > < script src = "esb.browser.js" > < / script > < / body >
```
4) Create bundle:
```bash
npx -y esbuild@0.19.5 esbrowser.js --bundle --outfile=esb.browser.js
```
5) Start a local HTTP server:
```bash
npx http-server .
```
Access the displayed URL (typically `http://localhost:8080` ) with a web browser.
It should attempt to download `Presidents.xlsx`
## NodeJS
ESBuild will bundle the SheetJS ECMAScript Module build:
```js
import { read, utils, write } from 'xlsx';
```
:::caution pass
To read and write files on the local filesystem using the SheetJS `readFile` and
`writeFile` methods[^1], the `fs` module must be manually added:
```js
import { set_fs, readFile } from 'xlsx';
import * as fs from 'fs';
set_fs(fs);
/* read pres.numbers in the same directory as the script */
const wb = readFile("pres.numbers");
```
:::
Assuming the primary source file is `in.js` , the following command will bundle
the script for NodeJS and generate `out.js` :
```bash
npx -y esbuild@0.19.5 in.js --bundle --platform=node --outfile=out.js
```
### NodeJS Demo
:::info pass
This demo script uses `fetch` and requires Node 18+.
:::
0) Prepare a blank project:
```bash
mkdir sheetjs-esbnode
cd sheetjs-esbnode
npm init -y
```
1) Install the tarball using a package manager:
< Tabs groupId = "pm" >
< TabItem value = "npm" label = "npm" >
< CodeBlock language = "bash" > {`\
npm i --save https://cdn.sheetjs.com/xlsx-${current}/xlsx-${current}.tgz`}
< / CodeBlock >
< / TabItem >
< TabItem value = "pnpm" label = "pnpm" >
< CodeBlock language = "bash" > {`\
pnpm install https://cdn.sheetjs.com/xlsx-${current}/xlsx-${current}.tgz`}
< / CodeBlock >
< / TabItem >
< TabItem value = "yarn" label = "Yarn" default >
< CodeBlock language = "bash" > {`\
yarn add https://cdn.sheetjs.com/xlsx-${current}/xlsx-${current}.tgz`}
< / CodeBlock >
< / TabItem >
< / Tabs >
2) Download [`esbnode.js` ](pathname:///esbuild/esbnode.js ) and move to the
project folder:
```bash
curl -LO https://docs.sheetjs.com/esbuild/esbnode.js
```
3) Create bundle:
```bash
npx -y esbuild@0.19.5 esbnode.js --bundle --platform=node --outfile=esb.node.js
```
4) Run the bundle:
```bash
node esb.node.js
```
The process will generate `Presidents.xlsx` in the project directory. Open the
file in a spreadsheet editor.
[^1]: The SheetJS [`readFile` ](/docs/api/parse-options ) and [`writeFile` ](/docs/api/write-options ) methods use the NodeJS `fs` module when available. It is not automatically loaded in the ECMAScript Module builds.
