For git tree selection use isomorphic-git or similar package

[MekDrop]

Code would look something like:

import * as git from 'isomorphic-git';
import http from 'isomorphic-git/http/web';
import LightningFS from '@isomorphic-git/lightning-fs';

const fs = new LightningFS('repos');

await git.clone({
  fs,
  http,
  dir: '/repo',
  url: 'https://gitlab.com/group/project.git',
  singleBranch: true,
  depth: 1,
  noCheckout: true,
});

const files = await git.listFiles({
  fs,
  dir: '/repo',
});