read-excel-file/modules/export/readXlsxFileWebWorker.js

Read `.xlsx` files in a web browser or in Node.js

// Unzipper is multi-threaded and it spawns a separate worker for each individual file
// inside the archive that is large-enough to justify spawning a worker.
// Because it uses its own `Worker` implementation, it won't use `createWorkerFunction()`.
//
// XML parser is itself single-threaded but it could spawn a separate worker for each
// individual `.xml` file that is large-enough to justify spawning a worker.
// So it could use `createWorkerFunction()`.
//
import createWorkerFunction from 'worker-f/browser';
import parseXml from '../xml/parseXml.js';
import unpackXlsxFile from './unpackXlsxFileBrowser.js';
import parseSpreadsheetContents from '../xlsx/parseSpreadsheetContents.js';

/**
 * Reads an `.xlsx` file.
 * @param  {(File|Blob|ArrayBuffer)} input
 * @param  {object} [options]
 * @return {Promise<Sheet[]>}
 */
export default function readXlsxFile(file, options) {
  return unpackXlsxFile(file).then(function (contents) {
    return parseSpreadsheetContents(createWorkerFunction, parseXml, contents, options);
  });
}
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