src/vs/workbench/api/common/extHostNotebookDocument.ts/ExtHostNotebookDocument/_setCellOutputItems
class ExtHostNotebookDocument:	private _setCellOutputItems(index: number, outputId: string, append: boolean, outputItems: extHostProtocol.NotebookOutputItemDto[]): void {
		const cell = this._cells[index];
		cell.setOutputItems(outputId, append, outputItems);
	}