src/vs/workbench/api/browser/mainThreadNotebookDto.ts/toNotebookDataDto
	export function toNotebookDataDto(data: notebookCommon.NotebookData): extHostProtocol.NotebookDataDto {
		return {
			metadata: data.metadata,
			cells: data.cells.map(toNotebookCellDataDto)
		};
	}