src/vs/workbench/contrib/notebook/browser/notebook.contribution.ts/CellInfoContentProvider/parseStreamOutput
class CellInfoContentProvider:	private parseStreamOutput(op?: ICellOutput): { content: string; mode: ILanguageSelection } | undefined {
		if (!op) {
			return;
		}

		const streamOutputData = getStreamOutputData(op.outputs);
		if (streamOutputData) {
			return {
				content: streamOutputData,
				mode: this._languageService.createById(PLAINTEXT_LANGUAGE_ID)
			};
		}

		return;
	}