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

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

import unzipFromArrayBuffer from '../zip/unzipFromArrayBuffer.js';
import UnzipError from '../zip/UnzipError.js';
import InvalidInputError from '../xlsx/file/InvalidInputError.js';
import filterZipArchiveEntry from './filterZipArchiveEntry.js';
import validateLeadingBytes from '../xlsx/file/validateLeadingBytes.js';
import checkpoint, { resetCheckpoint } from '../utility/checkpoint.js';

/**
 * Unpacks `*.xlsx` file contents.
 * An `.xlsx` file is really just a `.zip` archive with `.xml` files inside.
 * @param  {(Blob|ArrayBuffer)} input
 * @return {Promise<Record<string,Uint8Array>} Resolves to an object holding `*.xlsx` file entries.
 */
export default function unpackXlsxFile(input) {
  resetCheckpoint();
  checkpoint('unpack files');
  return getArrayBuffer(input).then(function (arrayBuffer) {
    validateLeadingBytes(new Uint8Array(arrayBuffer));
    return unzipFromArrayBuffer(arrayBuffer, {
      filter: filterZipArchiveEntry
    }).then(function (result) {
      return result;
    }, function (error) {
      if (error instanceof UnzipError) {
        throw new InvalidInputError('INVALID_ZIP', error.cause);
      } else {
        throw error;
      }
    });
  });
}
function getArrayBuffer(input) {
  if (input instanceof Blob) {
    return input.arrayBuffer();
  }
  if (input instanceof ArrayBuffer) {
    return Promise.resolve(input);
  }
  throw new InvalidInputError('INPUT_TYPE_NOT_SUPPORTED');
}
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