src/vs/workbench/api/common/extHostNotebookDocument.ts/ExtHostCell/constructor
class ExtHostCell:	constructor(
		readonly notebook: ExtHostNotebookDocument,
		private readonly _extHostDocument: ExtHostDocumentsAndEditors,
		private readonly _cellData: extHostProtocol.NotebookCellDto,
	) {
		this.handle = _cellData.handle;
		this.uri = URI.revive(_cellData.uri);
		this.cellKind = _cellData.cellKind;
		this._outputs = _cellData.outputs.map(extHostTypeConverters.NotebookCellOutput.to);
		this._internalMetadata = _cellData.internalMetadata ?? {};
		this._metadata = _cellData.metadata ?? {};
		this._previousResult = extHostTypeConverters.NotebookCellExecutionSummary.to(_cellData.internalMetadata ?? {});
	}