npm and error messages

node_modules/internal-ip/cli.js

@@ -0,0 +1,31 @@
+#!/usr/bin/env node
+/* eslint-disable no-nested-ternary */
+'use strict';
+var meow = require('meow');
+var internalIp = require('./');
+
+var cli = meow({
+	help: [
+		'Usage',
+		'  $ internal-ip',
+		'',
+		'Options',
+		'  -4, --ipv4  Return the IPv4 address (default)',
+		'  -6, --ipv6  Return the IPv6 address',
+		'',
+		'Examples',
+		'  $ internal-ip',
+		'  192.168.0.123',
+		'  $ internal-ip --ipv6',
+		'  fe80::200:f8ff:fe21:67cf'
+	]
+}, {
+	alias: {
+		4: 'ipv4',
+		6: 'ipv6'
+	}
+});
+
+var fn = cli.flags.ipv4 ? 'v4' : cli.flags.ipv6 ? 'v6' : 'v4';
+
+console.log(internalIp[fn]());