How to use the memory-fs.prototype function in memory-fs

function createNewMemoryFileSystem(): MemoryFileSystem {
  const _fs = new MemoryFileSystem();
  // Note: binding all methods of _fs
  // some libs use individual fs method
  // e.g const writeFileSync = fs.writeFileSync
  //  writeFileSync() // this will call method with wrong this
  // happening in find-config package
  Object.keys(MemoryFileSystem.prototype).forEach((key) => {
    if (typeof _fs[key] === 'function') {
      _fs[key] = _fs[key].bind(_fs);
    }
  });
  return _fs;
}

const MemoryFileSystem = require('memory-fs');
const fs = new MemoryFileSystem();
for (let f in MemoryFileSystem.prototype) {
  if (typeof MemoryFileSystem.prototype[f] === 'function') {
    fs[f] = MemoryFileSystem.prototype[f].bind(fs);
  }
}
fs.lstat = fs.stat;
fs.lstatSync = fs.statSync;

const readFileSync = fs.readFileSync;
fs.readFileSync = (path, encoding) => {
  if (encoding && encoding.encoding) encoding = encoding.encoding;
  return readFileSync(path, encoding);
};

const createWriteStream = fs.createWriteStream;
fs.createWriteStream = path => {
  const s = createWriteStream(path);
  return {

const MemoryFileSystem = require('memory-fs');
const fs = new MemoryFileSystem();
for (let f in MemoryFileSystem.prototype) {
  if (typeof MemoryFileSystem.prototype[f] === 'function') {
    fs[f] = MemoryFileSystem.prototype[f].bind(fs);
  }
}
fs.lstat = fs.stat;
fs.lstatSync = fs.statSync;

const readFileSync = fs.readFileSync;
fs.readFileSync = (path, encoding) => {
  if (encoding && encoding.encoding) encoding = encoding.encoding;
  return readFileSync(path, encoding);
};

const createWriteStream = fs.createWriteStream;
fs.createWriteStream = path => {
  const s = createWriteStream(path);