src/vs/base/browser/ui/tree/asyncDataTree.ts/CompressibleAsyncDataTreeNodeWrapper/element
class CompressibleAsyncDataTreeNodeWrapper:	get element(): ICompressedTreeNode<TInput | T> {
		return {
			elements: this.node.element.elements.map(e => e.element),
			incompressible: this.node.element.incompressible
		};
	}