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

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

// Uses an "async" function of the unzipper function
// just because it feels more correct to use it over the "sync" one
// because it isn't supposed to ever freeze the "main thread" (GUI).
//
// import unzipFromArrayBufferSync from '../zip/unzipFromArrayBufferSync.js'
import unzipFromArrayBuffer from '../zip/unzipFromArrayBuffer.js';
import convertValuesFromUint8ArraysToStrings from './convertValuesFromUint8ArraysToStrings.js';
import filterZipArchiveEntry from './filterZipArchiveEntry.js';

/**
 * Unpacks `*.xlsx` file contents.
 * An `.xlsx` file is really just a `.zip` archive with `.xml` files inside.
 * @param  {(File|Blob|ArrayBuffer)} input
 * @return {Promise<Record<string,string>} Resolves to an object holding `*.xlsx` file entries.
 */
export default function unpackXlsxFile(input) {
  if (input instanceof File || input instanceof Blob) {
    return input.arrayBuffer().then(getResultFromArrayBuffer);
  }
  return Promise.resolve(input).then(getResultFromArrayBuffer);
}
function getResultFromArrayBuffer(arrayBuffer) {
  return unzipFromArrayBuffer(arrayBuffer, {
    filter: filterZipArchiveEntry
  }).then(convertValuesFromUint8ArraysToStrings);
}

// function getResultFromArrayBufferSync(arrayBuffer) {
//  const result = unzipFromArrayBufferSync(arrayBuffer, { filter: filterZipArchiveEntry })
// 	return convertValuesFromUint8ArraysToStrings(result)
// }
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