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

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

import unzipFromStream from '../zip/unzipFromStream.js';
import UnzipError from '../zip/UnzipError.js';
import InvalidInputError from '../xlsx/file/InvalidInputError.js';
import convertInputToNodeStream from './convertInputToNodeStream.js';
import filterZipArchiveEntry from './filterZipArchiveEntry.js';
import InputValidationStream from '../xlsx/file/InputValidationStream.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  {(string|Stream|Buffer|Blob)} input
 * @return {Promise<Record<string,Uint8Array>} Resolves to an object holding `*.xlsx` file entries.
 */
export default function unpackXlsxFile(input) {
  resetCheckpoint();
  checkpoint('unpack files');
  var stream = convertInputToNodeStream(input);
  return new Promise(function (resolve, reject) {
    var streamWithInputValidation = stream
    // Because the original `stream` reference is going to be replaced,
    // while it still has that reference here, it should set up a listener
    // to catch errors emitted from the input stream (for example, a file read error).
    //
    // That's because the .pipe() method does not automatically propagate errors
    // from a source (input) stream to the destination stream or the end of the pipeline.
    // You would need to attach an 'error' event handler to each stream in the chain.
    //
    // A more convenient alternative would be to use `stream.pipeline()` function:
    // `pipeline(stream1, stream2, (error) => { ... })`
    //
    .on('error', reject)
    // Pipe the input through file type validation stream.
    // If the file type is invalid, the updated `stream` reference will emit
    // an "error" event, which is going to be caught inside `unzipFromStream_()` function.
    .pipe(new InputValidationStream());
    unzipFromStream(streamWithInputValidation, {
      filter: filterZipArchiveEntry
    }).then(resolve, function (error) {
      if (error instanceof UnzipError) {
        reject(new InvalidInputError('INVALID_ZIP', error.cause));
      } else {
        reject(error);
      }
    });
  });
}
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