code: public UserPoolType withAliasAttributes(String... aliasAttributes) {
          if (this.aliasAttributes == null) {
              setAliasAttributes(new java.util.ArrayList<String>(aliasAttributes.length));
          }
          for (String ele : aliasAttributes) {
              this.aliasAttributes.add(ele);
          }
          return this;
      }
docs: <p>
  Specifies the attributes that are aliased in a user pool.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setAliasAttributes(java.util.Collection)} or {@link #withAliasAttributes(java.util.Collection)} if you
  want to override the existing values.
  </p>
  
  @param aliasAttributes
  Specifies the attributes that are aliased in a user pool.
  @return Returns a reference to this object so that method calls can be chained together.
  @see AliasAttributeType