Keyboard.js is released under the Apache 2.0 license and downloaded from:
https://github.com/apache/guacamole-client/tree/master/guacamole-common-js/src/main/webapp/modules/Keyboard.js

```javascript
/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
```

Line 20 has been modified to allow importation with webpack, from:
```javascript
var Guacamole = Guacamole || {};
```
to:
```javascript
const Guacamole = {};
export { Guacamole as default };
```