I have a local directory and I want to upload its contents to cloud storage, but when using transferManager.uploadManyFiles with either the directory name, or array of files, the destination of the file in cloud storage is taken from the local file path.

local directory structure:

.
└── data
    └── avatars
        └── <image files>

here's my code

import { Storage, TransferManager } from "@google-cloud/storage";

const storage = new Storage();
const transferManager = new TransferManager(storage.bucket("bucket-name"));

const res = await transferManager.uploadManyFiles("data/avatars", {
  prefix: "avatars",
  passthroughOptions: {
    destination: "", // ???
  },
  skipIfExists: true,
});

when uploaded with following code, it becomes

.
└── avatars
    └── data
        └── avatars
            └── <image files>

the prefix property works, but I want to upload files directly to avatars/
there seem to be a passthroughOptions that can take a destination, but when using uploadManyFiles we don't know the exact file names, so can't make the full path

Shouldn't it be that while using prefix, property, the local file path shouldn't be considered?