fix(help): display error message if no option provided on startup

bin/config-yargs.js

@@ -1,3 +1,6 @@
+const chalk = require("chalk");
+const logSymbols = require("log-symbols");
+
 var CONFIG_GROUP = "Config options:";
 var BASIC_GROUP = "Basic options:";
 var MODULE_GROUP = "Module options:";
@@ -348,5 +351,15 @@ module.exports = function(yargs) {
 				group: BASIC_GROUP
 			}
 		})
+		.demandCommand(1,
+			"\n" + logSymbols.error + chalk.blue(" ERROR ") + "Insufficient number of arguments provided " +
+			"\n" + logSymbols.info + chalk.blue(" INFO ") + "Alternatively, run `webpack(-cli) --help` for usage info." +
+			"\n\n"
+		)
+		.fail((msg, err, yargs) => {
+			if (err) throw err; // preserve stack
+			process.stdout.write(msg);
+			process.exit(1);
+		})
 		.strict();
 };