TreeViewPlugin ESDoc not generating

[xeolabs]

Seems there are some JS expressions that confuse it?

When building docs with npm run docs:

parse: /home/lindsay/xeokit/xeokit-sdk-feb2/src/plugins/TreeViewPlugin/TreeViewPlugin.js
warning: could not parse the following code. if you want to use ECMAScript proposals, see https://esdoc.org/manual/feature.html#ecmascript-proposal
/home/lindsay/xeokit/xeokit-sdk-feb2/src/plugins/TreeViewPlugin/TreeViewPlugin.js
416|         this._pruneEmptyNodes = cfg.pruneEmptyNodes;
417|         this._showListItemElementId = null;
418|         this._renderService = cfg.renderService || new RenderService();
419|         this._showIndeterminate = cfg.showIndeterminate ?? false;
420|         this._showProjectNode = cfg.showProjectNode ?? false;
421|         this._elevationSortFunction = cfg.elevationSortFunction ?? undefined;
422|         this._defaultSortFunction = cfg.defaultSortFunction ?? undefined;