extensions/ipynb/src/deserializers.ts/translateStreamOutput
function translateStreamOutput(output: nbformat.IStream): NotebookCellOutput {
	const value = concatMultilineString(output.text);
	const item = output.name === 'stderr' ? NotebookCellOutputItem.stderr(value) : NotebookCellOutputItem.stdout(value);
	return new NotebookCellOutput([item], getOutputMetadata(output));
}