changing code from fs to fs-extra using node js

I wrote a code by using var fs= require("fs").promises;

to read all my files in directories and sub-directories

var fs= require("fs").promises;

async function checkFileLoc(folderPath, depth) {
  depth -= 1;
  let files = await fs.readdir(folderPath);
  files = await Promise.all(
    files.map(async (file) => {
      const filePath = path.join(folderPath, file);
      const stats = await fs.stat(filePath);
      if (stats.isDirectory() && depth > 0) {
        return checkFileLoc(filePath, depth);
      } else if (stats.isFile()) return filePath;
      else return null;
    })
  );
  return files
    .reduce((all, folderContents) => all.concat(folderContents), [])
    .filter((e) => e != null);
}

Then I install fs-extra package in my project and replace var fs=require("fs");to var fse=require("fs-extra"); and made changes in my code like this

var fse=require("fs-extra");

async function checkFileLoc(folderPath, depth) {
  depth -= 1;
  let files = await fse.readdir(folderPath);
  files = await Promise.all(
    files.map(async (file) => {
      const filePath = path.join(folderPath, file);
      const stats = await fse.stat(filePath);
      if (stats.isDirectory() && depth > 0) {
        return checkFileLoc(filePath, depth);
      } else if (stats.isFile()) return filePath;
      else return null;
    })
  );
  return files
    .reduce((all, folderContents) => all.concat(folderContents), [])
    .filter((e) => e != null);
}

when I was using fs i was getting the desire output and someone told me fs-extra is advance then fs and all you have to do is replace fs with fse my code not working properly any solution where i have made mistake ?

My output while using var fs= require("fs").promise; is has i made to read all the files present inside directories

FilePath=
[/home/work/test/abc.html
/home/work/test/index.js
/home/work/test/product.js
]

My output while using var fse=require("fs-extra") empty

filePath=[]

My output don't come while using fs-extra

Solution

I tried to figure it out what changes i have to made if I am using var fse= require("fs-extra");

so my code will look like this

var fse=require("fs-extra");

async function checkFileLoc(folderPath, depth) {
  depth -= 1;
  let files = fse.readdirSync(folderPath);
  files = await Promise.all(
    files.map(async (file) => {
      const filePath = path.join(folderPath, file);
      const stats = fse.statSync(filePath);
      if (stats.isDirectory() && depth > 0) {
        return checkFileLoc(filePath, depth);
      } else if (stats.isFile()) return filePath;
      else return null;
    })
  );
  return files
    .reduce((all, folderContents) => all.concat(folderContents), [])
    .filter((e) => e != null);
}

I replaced my

var fs=require("fs"); to var fse=require("fs-extra");
let files = await fs.readdir(folderPath); with let files = fs.readdirSync(folderPath);
const stats = await fs.stat(filePath); with const stats = fs.statSync(filePath);

now i am getting my desire output