NotebookCellOutput  
    Notebook cell output represents a result of executing a cell. It is a container type for multiple output items where contained items represent the same result but use different MIME types.
Constructors
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                  constructor(items: ReadonlyArray<NotebookCellOutputItem>, metadata: ReadonlyRecord<JsString, *> = definedExternally)
Create new notebook output.
Properties
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                  The output items of this output. Each item must represent the same result. Note that repeated MIME types per output is invalid and that the editor will just pick one of them.
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                  Arbitrary metadata for this cell output. Can be anything but must be JSON-stringifyable.