121   get checked() {  method in LitTreeNode
125   set checked(value) {  method in LitTreeNode
144       this.onChange(e.detail.checked);
153       this.onChange(!this.data?.checked);
157   onChange(checked: boolean) {
158     this.checked = checked;
159     this.data!.checked = checked;
161     this.dispatchEvent(new CustomEvent('change', {detail: checked}));
328     if (this.hasAttribute('checked')) this.checkboxElement!.checked = true;
333     if (this.checked) {
338         if (this.checked) {
340             a.checked = true;
344 …  this.nextElementSibling.querySelectorAll('lit-tree-node').forEach((a: any) => a.checked = false);
349 ….parentElement.parentElement.querySelectorAll('lit-tree-node')).every((item: any) => item.checked);
350 …t.parentElement.querySelectorAll('lit-tree-node')).some((item: any, index, array) => item.checked);
352             element.parentElement.parentElement.previousElementSibling.checked = true;
454         this.checkboxElement.checked = this.hasAttribute('checked');