Feat: Added default fallback for CLI (#271)

bin/lux

@@ -18,6 +18,8 @@ const PROJECT_REQUIRED = [
 
 const cli = require('commander');
 const path = require('path');
+const { EOL } = require('os');
+const { red, green } = require('chalk');
 
 function inLuxProject() {
   if (PWD.indexOf(path.join('lux', 'test', 'test-app')) >= 0) {
@@ -32,6 +34,11 @@ function inLuxProject() {
   }
 }
 
+function commandNotFound(cmd) {
+  console.log(`${EOL}  ${red(cmd)} is not a valid command${EOL}`);
+  console.log(`  Use ${green('lux --help')} for a full list of commands${EOL}`);
+}
+
 function exec(cmd, ...args) {
   let handler;
 
@@ -232,6 +239,11 @@ cli
       .catch(rescue);
   });
 
+cli
+  .on('*', (cmd) => {
+    commandNotFound(cmd)
+  });
+
 cli.parse(process.argv);
 
 if (!cli.args.length) {