Create a new JavaScript file named html5shiv.js in assets/js directory.

Import html5shiv.js from the HTML5Shiv package we downloaded through Bower into this file:

// @koala-prepend "../../bower_components/html5shiv/dist/html5shiv.js"

Create a new JavaScript file named bootstrap.js.

In bootstrap.js, import the JavaScript libraries that are required to turn the off-canvas navigation functionality on, as follows:

// @koala-prepend "../../bower_components/jquery/dist/jquery.js"
// @koala-prepend "../../bower_components/bootstrap/js/transition.js"
// @koala-prepend "../../bower_components/jasny-bootstrap/js/offcanvas.js"

Open Koala and ensure that the Auto Compile option for html5shiv.js and bootstrap.js is checked, as shown in the following screenshot:

Also, make sure that the output path of these two JavaScript files is set to the /assets/js directory, as shown in the following screenshot:

Compile both these JavaScript files by clicking on the Compile...