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docz/docs/04-getting-started/03-demos/09-bundler.md
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docz/docs/04-getting-started/03-demos/09-bundler.md
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---
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sidebar_position: 9
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title: Bundlers
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---
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import current from '/version.js';
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import Tabs from '@theme/Tabs';
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import TabItem from '@theme/TabItem';
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SheetJS predates ECMAScript modules and bundler tools like Webpack. As best
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practices have evolved, stress testing SheetJS libraries have revealed bugs in
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the respective bundlers. This demo collects various notes and provides basic
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examples. Issues should be reported to the respective bundler projects.
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## Parcel
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Parcel Bundler should play nice with SheetJS out of the box.
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Errors of the form `Could not statically evaluate fs call` stem from a
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[parcel bug](https://github.com/parcel-bundler/parcel/pull/523). Upgrade to
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Parcel version 1.5.0 or later.
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<details><summary><b>Complete Example</b> (click to show)</summary>
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This demo follows the [Presidents Example](../../example).
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1) Save the following to `index.html`:
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```html title="index.html"
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<body>
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<h3>SheetJS <span id="vers"></span> export demo</h3>
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<button id="xport">Click to Export!</button>
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<!-- the script tag must be marked as `type="module"` -->
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<!-- highlight-next-line -->
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<script type="module">
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// ESM-style import from "xlsx"
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// highlight-next-line
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import { utils, version, writeFile } from 'xlsx';
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document.getElementById("vers").innerText = version;
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document.getElementById("xport").onclick = async() => {
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/* fetch JSON data and parse */
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const url = "https://sheetjs.com/executive.json";
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const raw_data = await (await fetch(url)).json();
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/* filter for the Presidents */
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const prez = raw_data.filter(row => row.terms.some(term => term.type === "prez"));
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/* flatten objects */
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const rows = prez.map(row => ({
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name: row.name.first + " " + row.name.last,
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birthday: row.bio.birthday
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}));
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/* generate worksheet and workbook */
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const worksheet = utils.json_to_sheet(rows);
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const workbook = utils.book_new();
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utils.book_append_sheet(workbook, worksheet, "Dates");
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/* fix headers */
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utils.sheet_add_aoa(worksheet, [["Name", "Birthday"]], { origin: "A1" });
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/* calculate column width */
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const max_width = rows.reduce((w, r) => Math.max(w, r.name.length), 10);
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worksheet["!cols"] = [ { wch: max_width } ];
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/* create an XLSX file and try to save to Presidents.xlsx */
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writeFile(workbook, "Presidents.xlsx");
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};
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</script>
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<body>
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```
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2) Install the SheetJS node module:
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<Tabs>
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<TabItem value="npm" label="npm">
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<pre><code parentName="pre" {...{"className": "language-bash"}}>{`\
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$ npm install --save https://cdn.sheetjs.com/xlsx-${current}/xlsx-${current}.tgz`}
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</code></pre>
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</TabItem>
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<TabItem value="pnpm" label="pnpm">
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<pre><code parentName="pre" {...{"className": "language-bash"}}>{`\
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$ pnpm install --save https://cdn.sheetjs.com/xlsx-${current}/xlsx-${current}.tgz`}
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</code></pre>
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</TabItem>
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<TabItem value="yarn" label="Yarn" default>
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<pre><code parentName="pre" {...{"className": "language-bash"}}>{`\
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$ yarn add --save https://cdn.sheetjs.com/xlsx-${current}/xlsx-${current}.tgz`}
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</code></pre>
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</TabItem>
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</Tabs>
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3) Run the Parcel CLI tool:
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```bash
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npx -y parcel index.html
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```
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4) Access the page listed in the output (typically `http://localhost:1234`) and
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click the "Click to Export!" button to generate a file.
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</details>
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@ -50,7 +50,7 @@ The demo projects include small runnable examples and short explainers.
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### Bundlers and Tooling
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- [`browserify`](https://github.com/SheetJS/SheetJS/tree/master/demos/browserify/)
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- [`parcel`](https://github.com/SheetJS/SheetJS/tree/master/demos/parcel/)
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- [`parcel`](./bundler#parcel)
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- [`requirejs`](https://github.com/SheetJS/SheetJS/tree/master/demos/requirejs/)
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- [`rollup`](https://github.com/SheetJS/SheetJS/tree/master/demos/rollup/)
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- [`systemjs`](https://github.com/SheetJS/SheetJS/tree/master/demos/systemjs/)
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@ -90,6 +90,48 @@ XLSX.writeFile(workbook, "out.xlsb");
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/* at this point, out.xlsb will have been downloaded */
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```
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:::caution Web Workers
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None of the file writing APIs work from Web Workers. To generate a file:
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1) use `XLSX.write` with type `array` to generate a `Uint8Array`:
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```js
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// in the web worker, generate the XLSX file as a Uint8Array
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const u8 = XLSX.write(workbook, { type: "array", bookType: "xlsx" });
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```
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2) send the data back to the main thread:
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```js
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// in the web worker, send the generated data back to the main thread
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postMessage({t: "export", v: u8 });
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```
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3) from the main thread, add an event listener to write to file:
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```js
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// in the main page
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worker.addEventListener('message', function(e) {
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if(e && e.data && e.data.t == "export") {
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e.stopPropagation();
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e.preventDefault();
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// data will be the Uint8Array from the worker
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const data = e.data.v;
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var blob = new Blob([data], {type:"application/octet-stream"});
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var url = URL.createObjectURL(blob);
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var a = document.createElement("a");
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a.download = "SheetJSXPort.xlsx";
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a.href = url;
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document.body.appendChild(a);
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a.click();
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}
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});
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```
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:::
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<details>
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<summary><b>SWF workaround for Windows 95+</b> (click to show)</summary>
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@ -17,13 +17,13 @@
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"@cmfcmf/docusaurus-search-local": "^0.10.0",
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"@docusaurus/core": "2.0.0-beta.20",
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"@docusaurus/preset-classic": "2.0.0-beta.20",
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"@docusaurus/theme-common": "^2.0.0-beta.20",
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"@docusaurus/theme-live-codeblock": "^2.0.0-beta.20",
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"@mdx-js/react": "^1.6.22",
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"clsx": "^1.1.1",
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"prism-react-renderer": "^1.3.1",
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"react": "^17.0.2",
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"react-dom": "^17.0.2",
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"@docusaurus/theme-common": "2.0.0-beta.20",
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"@docusaurus/theme-live-codeblock": "2.0.0-beta.20",
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"@mdx-js/react": "1.6.22",
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"clsx": "1.1.1",
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"prism-react-renderer": "1.3.1",
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"react": "17.0.2",
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"react-dom": "17.0.2",
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"xlsx": "https://cdn.sheetjs.com/xlsx-latest/xlsx-latest.tgz"
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},
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"devDependencies": {
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