[Vuejs]-Get siblings of created file in firebase cloud function triggered by onFinalize

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As per the documentation Doug Stevenson linked (2nd code sample for Node.js), you can list objects from a specified folder within your bucket using prefixes and delimiters.

Sample from the mentioned documentation:

/**
 * TODO(developer): Uncomment the following lines before running the sample.
 */
// const bucketName = 'Name of a bucket, e.g. my-bucket';
// const prefix = 'Prefix by which to filter, e.g. public/';
// const delimiter = 'Delimiter to use, e.g. /';

// Imports the Google Cloud client library
const {Storage} = require('@google-cloud/storage');

// Creates a client
const storage = new Storage();

async function listFilesByPrefix() {
  /**
   * This can be used to list all blobs in a "folder", e.g. "public/".
   *
   * The delimiter argument can be used to restrict the results to only the
   * "files" in the given "folder". Without the delimiter, the entire tree under
   * the prefix is returned. For example, given these blobs:
   *
   *   /a/1.txt
   *   /a/b/2.txt
   *
   * If you just specify prefix = '/a', you'll get back:
   *
   *   /a/1.txt
   *   /a/b/2.txt
   *
   * However, if you specify prefix='/a' and delimiter='/', you'll get back:
   *
   *   /a/1.txt
   */
  const options = {
    prefix: prefix,
  };

  if (delimiter) {
    options.delimiter = delimiter;
  }

  // Lists files in the bucket, filtered by a prefix
  const [files] = await storage.bucket(bucketName).getFiles(options);

  console.log('Files:');
  files.forEach(file => {
    console.log(file.name);
  });
}

listFilesByPrefix().catch(console.error);

Does that mean that all files will be returned at first and then will
be filtered by prefix?

As I see in the code sample above, the array [files] will store the objects that already pass the filter requirements:

const [files] = await storage.bucket(bucketName).getFiles(options);

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