in scripts/docsite.ts [32:50]
function updateNavNode(node: INode): void {
let liClassName: string = 'navtree-li';
if (node.ulElement) {
if (node.expanded) {
liClassName += ' navtree-li-expanded';
node.ulElement.className = 'navtree-ul-expanded';
} else {
liClassName += ' navtree-li-collapsed';
node.ulElement.className = 'navtree-ul-collapsed';
}
}
if (node.currentPage) {
liClassName += ' navtree-li-current';
}
node.liElement.className = liClassName;
}