extensions/references-view/src/types/model.ts/TypesTreeInput/constructor
class TypesTreeInput:	constructor(
		readonly location: vscode.Location,
		readonly direction: TypeHierarchyDirection,
	) {
		this.title = direction === TypeHierarchyDirection.Supertypes
			? vscode.l10n.t('Supertypes Of')
			: vscode.l10n.t('Subtypes Of');
	}