Webpack fails to build on NTFS filesystems

reproduce-build-error.sh

#!/bin/bash

# create temporary directory and move to it
FOLDER=$(mktemp -d)
echo "Moving to folder $FOLDER"
cd $FOLDER

# create a 50M file
FILE=test.ntfs
echo "Creating empty file $FILE"
dd if=/dev/zero of="$FILE" bs=1M count=50

# find available loop device
LOOPDEV=$(losetup -f)
echo "The following loop-device will be used: $LOOPDEV"

# format the file
FORMAT=ntfs

echo "Formatting file $FILE as ${FORMAT}-filesystem (requires sudo)."
sudo    losetup $LOOPDEV "$FILE"
        # attach device
sudo    mkfs -t $FORMAT $LOOPDEV
        # format image
sudo    losetup -d $LOOPDEV
        # detach device

# mount the file
MOUNTPOINT=test
mkdir $MOUNTPOINT

echo "Mounting formatted image $FILE onto folder $MOUNTPOINT (requires sudo)."
sudo    mount -t $FORMAT -o loop $FILE $MOUNTPOINT
cd $MOUNTPOINT

# move into the image, and try to build webpack
echo "Initialising NPM and installing Webpack..."
npm init -yf
npm i webpack 
  # This fails with:
  #   npm ERR! code ENOTEMPTY
  #   npm ERR! errno -39
  #   npm ERR! syscall rmdir