'extensions' => [
        'js-editor' => [
        
            // Set to false if you want to disable this extension
            'enable' => true,
            
            // Editor configuration
            'config' => [
                
            ]
        ]
    ]

$form->js('code');
// alias of `js` method
$form->javascript('code');
$form->json('code');
$form->jsond('code');
$form->typescript('code');

$form->js('code')->height(500);