src/vs/workbench/api/browser/mainThreadNotebookDto.ts/toNotebookCellDataDto
	export function toNotebookCellDataDto(cell: notebookCommon.ICellDto2): extHostProtocol.NotebookCellDataDto {
		return {
			cellKind: cell.cellKind,
			language: cell.language,
			mime: cell.mime,
			source: cell.source,
			internalMetadata: cell.internalMetadata,
			metadata: cell.metadata,
			outputs: cell.outputs.map(toNotebookOutputDto)
		};
	}