src/vs/workbench/api/common/extHostNotebookKernels.ts/NotebookCellExecutionTask/updateOutputs
class NotebookCellExecutionTask:	private async updateOutputs(outputs: vscode.NotebookCellOutput | vscode.NotebookCellOutput[], cell: vscode.NotebookCell | undefined, append: boolean): Promise<void> {
		const handle = this.cellIndexToHandle(cell);
		const outputDtos = this.validateAndConvertOutputs(asArray(outputs));
		return this.updateSoon(
			{
				editType: CellExecutionUpdateType.Output,
				cellHandle: handle,
				append,
				outputs: outputDtos
			});
	}