Merge branch 'develop' into feature/multiple-aliases

index.js

@@ -1223,16 +1223,14 @@ class Command extends EventEmitter {
    */
 
   alias(alias) {
-    if (alias === undefined) return this._alias;
+    if (alias === undefined) return this._alias[0]; // just return first, for backwards compatibility
 
     let command = this;
     if (this.commands.length !== 0 && this.commands[this.commands.length - 1]._executableHandler) {
       // assume adding alias for last added executable subcommand, rather than this
       command = this.commands[this.commands.length - 1];
     }
 
-    if (arguments.length === 0) return command._alias[0]; // just return first, and return string not array for backwards compatibility
-
     if (alias === command._name) throw new Error('Command alias can\'t be the same as its name');
 
     command._alias.push(alias);