src/vs/workbench/contrib/notebook/browser/notebook.contribution.ts/SimpleNotebookWorkingCopyEditorHandler/_getViewType
class SimpleNotebookWorkingCopyEditorHandler:	private _getViewType(workingCopy: IWorkingCopyIdentifier): string | undefined {
		return NotebookWorkingCopyTypeIdentifier.parse(workingCopy.typeId);
	}