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

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

import xml from '../xml/xml.js';
import unpackXlsxFile from './unpackXlsxFileBrowser.js';
import parseSheet from './parseSheet.js';

/**
 * Reads a single sheet from an `.xlsx` file.
 * @param  {(File|Blob|ArrayBuffer)} input
 * @param  {(number|string)} [sheet] — Sheet number or sheet name
 * @param  {object} [options]
 * @return {Promise<SheetData>}
 */
export default function readSheet(input, sheet, options) {
  // `sheet` argument is optional.
  // It could be omitted while `options` argument is passed.
  if (!options && sheet && typeof sheet !== 'number' && typeof sheet !== 'string') {
    options = sheet;
    sheet = undefined;
  }
  return unpackXlsxFile(input).then(function (contents) {
    return parseSheet(contents, xml, sheet, options);
  });
}
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