src/vs/workbench/browser/parts/views/treeView.ts/CustomTreeViewDragAndDrop/debugLog
class CustomTreeViewDragAndDrop:	private debugLog(types: Set<string>) {
		if (types.size) {
			this.logService.debug(`TreeView dragged mime types: ${Array.from(types).join(', ')}`);
		} else {
			this.logService.debug(`TreeView dragged with no supported mime types.`);
		}
	}