Typescript script to copy a file in a bucket and pastes it in another path

copyFile.ts

import {QueryDocumentSnapshot} from "@google-cloud/firestore";
import * as functions from "firebase-functions";
import {EventContext} from "firebase-functions";
import {Storage} from "@google-cloud/storage";

export const shareToAnotherGraph = async (snap: QueryDocumentSnapshot, _context: EventContext, db: FirebaseFirestore.Firestore) => {
  const data = snap.data();
  // The ID of your GCP project
  const projectId = "example";
  // The ID of the bucket the original object is in
  const sourceBucket = "example.appspot.com";
  // The ID of the GCS object to copy
  const sourceFile = data.sourcePath;

  functions.logger.log("sourceFile: ", sourceFile);
  // The ID of the bucket to copy the object to
  const destinationBucket = "example.appspot.com";

  // get the name of the file to copy
  const sourceFileString = String(snap.data().sourcePathString);
  const sourceFileSegments = sourceFileString.split("/");
  const sourceFileName = String(sourceFileSegments[sourceFileSegments.length - 1]);
  functions.logger.log("sourceFileName: ", sourceFileName);

  // get the last item after the / of the destination path

  const destinationPath = String(snap.data().destinationPathString);
  const destinationPathSegments = destinationPath.split("/");
  const destinationPathName = String(destinationPathSegments[destinationPathSegments.length - 1]);
  functions.logger.log("destinationPathName: ", destinationPathName);


  const storage = new Storage({
    projectId: projectId,
  });

  const [Files] = await storage.bucket(sourceBucket).getFiles({
    prefix: sourceFile,
  });
  // create a regex to use the replace function
  const regex = new RegExp(sourceFileName, "g");

  for (const file of Files) {
    const fileName = file.name;
    if (fileName.includes(sourceFileName)) {
      const destination = storage.bucket(destinationBucket).file(fileName.replace(regex, destinationPathName));
      functions.logger.log("Destination file.name: ", file.name);
      await file.copy(destination);
    } 
  }
  return;
};