throw error instead of just logging

Author: morbidick

lib/cli.js

@@ -135,7 +135,10 @@ for (let i = 0; i < process.argv.length; i++) {
     }
 }
 
-devServer(options);
+devServer(options).catch(e => {
+    console.error(e.message);
+    process.exit(1);
+});
 
 // Needed for posix systems when used with npm-run-all.
 process.on('SIGTERM', () => {

lib/dev-server.js

@@ -54,7 +54,7 @@ async function devServer(options) {
 
     if (options.https) {
         if (!(options.key && options.cert)) {
-            console.log('Usage of --https requires --cert and --key to be set.')
+            throw new Error('Usage of https requires cert and key to be set.')
         }
         const key = fs.readFileSync(options.key)
         const cert = fs.readFileSync(options.cert)