pkg: softens the error handling

This removes the global handler for unhandledRejection from the process.
The main run function will no longer call process.exit explicitly

Semver: major

lib/index.js

@@ -33,20 +33,24 @@ colors = [
 , 'greenBright', 'yellowBright', 'cyanBright'
 ];
 
-process.on('unhandledRejection', onError);
-
 function onError (err) {
   console.error(`${chalk.red(err.name)}: ${err.message}`);
   if(parsed && parsed.traceback) {
   console.error(chalk.bold(chalk.red(err.stack)));
   } else {
     console.error('use --traceback for full stacktrace');
   }
-  return conf.get('exitOnError') ? process.exit( err.code || 1 ) : null;
+  const code = isFinite(err.code) ? err.code : 1
+
+  if (conf.get('exitOnError')) {
+    process.exit(code)
+    return
+  }
+  process.exitCode = code
 }
 
 function onComplete(content) {
-  typeof content === 'string' && console.log( content );
+  typeof content === 'string' && console.log(content);
   if(conf.get('exitOnContent')) {
     process.exit(0);
   }
@@ -149,5 +153,4 @@ function run( ){
 
   console.error('unknown command %s', command );
   console.error('know commands: %s ', Object.keys( commands ).join(', ') );
-  process.exit(0);
 }