How to use the gojs.Diagram.Uniform function in gojs

initialContentAlignment: go.Spot.LeftCenter,
                layout: $(
                    go.TreeLayout,
                    {
                        angle: 0,
                        arrangement: go.TreeLayout.ArrangementVertical,
                        treeStyle: go.TreeLayout.StyleLayered
                    }),
                isReadOnly: true
            });

        this.myDiagram.allowHorizontalScroll = true;
        this.myDiagram.allowVerticalScroll = true;
        this.myDiagram.allowZoom = false;
        this.myDiagram.allowSelect = true;
        this.myDiagram.autoScale = Diagram.Uniform;
        this.myDiagram.contentAlignment = go.Spot.LeftCenter;
        this.myDiagram.toolManager.panningTool.isEnabled = false;
        this.myDiagram.toolManager.mouseWheelBehavior = ToolManager.WheelScroll;

        // define a simple Node template
        this.myDiagram.nodeTemplate =
            $(
                go.Node,
                'Auto',  // the Shape will go around the TextBlock
                { selectionChanged: (node: Node) => this.props.onNodeSelection(node.key as string, node.isSelected) },
                $(
                    go.Shape,
                    'RoundedRectangle',
                    { strokeWidth: 0 },
                    // Shape.fill is bound to Node.data.color
                    new go.Binding('fill', 'color')),

private createDiagram(diagramId: string): Diagram {
        const $ = go.GraphObject.make;

        const myDiagram: Diagram = $(go.Diagram, diagramId, {
            initialContentAlignment: go.Spot.LeftCenter,
            layout: $(go.TreeLayout, {
                angle: 0,
                arrangement: go.TreeLayout.ArrangementVertical,
                treeStyle: go.TreeLayout.StyleLayered
            }),
            isReadOnly: false,
            allowHorizontalScroll: true,
            allowVerticalScroll: true,
            allowZoom: false,
            allowSelect: true,
            autoScale: Diagram.Uniform,
            contentAlignment: go.Spot.LeftCenter,
            TextEdited: this.onTextEdited
        });

        myDiagram.toolManager.panningTool.isEnabled = false;
        myDiagram.toolManager.mouseWheelBehavior = ToolManager.WheelScroll;

        myDiagram.nodeTemplate = $(
            go.Node,
            'Auto',
            {
                selectionChanged: node => this.props.onNodeSelection(node.key as string, node.isSelected)
            },
            $(go.Shape, 'RoundedRectangle', { strokeWidth: 0 }, new go.Binding('fill', 'color')),
            $(go.TextBlock, { margin: 8, editable: true }, new go.Binding('text', 'label'))
        );