extensions/references-view/src/types/model.ts/TypesModel/remove
class TypesModel:	remove(item: TypeItem) {
		const isInRoot = this.roots.includes(item);
		const siblings = isInRoot ? this.roots : item.parent?.children;
		if (siblings) {
			del(siblings, item);
			this._onDidChange.fire(this);
		}
	}