in src/Sunburst.ts [363:375]
private addAnInstanceToEnumeration(
instanceEnumeration: VisualObjectInstanceEnumeration,
instance: VisualObjectInstance
): void {
if ((<VisualObjectInstanceEnumerationObject>instanceEnumeration).instances) {
(<VisualObjectInstanceEnumerationObject>instanceEnumeration)
.instances
.push(instance);
} else {
(<VisualObjectInstance[]>instanceEnumeration).push(instance);
}
}