npm script fix for Windows shared node installation with WSL

npm

#!/bin/sh
(set -o igncr) 2>/dev/null && set -o igncr; # cygwin encoding fix

basedir=`dirname "$0"`

case `uname` in
    *CYGWIN*) basedir=`cygpath -w "$basedir"`;;
esac

if grep -iq 'Microsoft\|WSL' /proc/version; then
	if [ -x /bin/wslpath ]; then
		# On recent WSL builds, use wslpath to transform the path
		basedir=$(wslpath -m "$basedir")
	else
		# If running under older WSL, inform the user to install
		# Windows 10 version 1803 or above.
		# The next line can be uncommented (and comment the next 2 ones) if the Windows mount path is in /mnt or /
		# basedir=$(echo $basedir | sed -r 's,^\/(mnt\/)?([a-zA-Z])\/,\2:\/,g')
		echo "Error: Windows version not supported, you must use Windows 10 version 1803 or above"
		exit 1
	fi
fi

NODE_EXE="$basedir/node.exe"
if ! [ -x "$NODE_EXE" ]; then
  NODE_EXE=node
fi

NPM_CLI_JS="$basedir/node_modules/npm/bin/npm-cli.js"

case `uname` in
  *MINGW*)
    NPM_PREFIX=`"$NODE_EXE" "$NPM_CLI_JS" prefix -g`
    NPM_PREFIX_NPM_CLI_JS="$NPM_PREFIX/node_modules/npm/bin/npm-cli.js"
    if [ -f "$NPM_PREFIX_NPM_CLI_JS" ]; then
      NPM_CLI_JS="$NPM_PREFIX_NPM_CLI_JS"
    fi
    ;;
  *CYGWIN*)
    NPM_PREFIX=`"$NODE_EXE" "$NPM_CLI_JS" prefix -g`
    NPM_PREFIX_NPM_CLI_JS="$NPM_PREFIX/node_modules/npm/bin/npm-cli.js"
    if [ -f "$NPM_PREFIX_NPM_CLI_JS" ]; then
      NPM_CLI_JS="$NPM_PREFIX_NPM_CLI_JS"
    fi
    ;;
esac

"$NODE_EXE" "$NPM_CLI_JS" "$@"