Testing to see if I can build an Opentype Panel

FontSpike.js

framework("CoreText");
const document = require("sketch").getSelectedDocument();
const textLayer = document.selectedLayers.layers[0];

const font = textLayer.sketchObject.font()

const descriptor = font.fontDescriptor().fontDescriptorByAddingAttributes({
    [NSFontFeatureSettingsAttribute]: [
        {
	    	[NSFontFeatureTypeIdentifierKey]: kLowerCaseType,
		    [NSFontFeatureSelectorIdentifierKey]: kLowerCaseSmallCapsSelector
        },
        {
            [NSFontFeatureTypeIdentifierKey]: kUpperCaseType,
		    [NSFontFeatureSelectorIdentifierKey]: kUpperCaseSmallCapsSelector
        },
        {
            [NSFontFeatureTypeIdentifierKey]: kNumberCaseType,
		    [NSFontFeatureSelectorIdentifierKey]: kLowerCaseNumbersSelector
        }
    ]
});
const newFont = NSFont.fontWithDescriptor_size(descriptor, 20);

textLayer.sketchObject.setFont(newFont);
document.sketchObject.inspectorController().reload();