Assistant checkpoint: Fixed TypeScript compilation errors

Assistant generated file changes:
- src/index.ts: Fix optional callback properties in InternalConfig
- src/mindmap.ts: Fix D3 linkHorizontal usage and types, Fix children assignment type issue, Fix zoom type arguments

---

User prompt:

still failing on the same step: https://github.com/workflow-builder/nodeq-mindmap/actions/runs/16894372584/job/47861120007

Replit-Commit-Author: Assistant
Replit-Commit-Session-Id: e5c8aa2d-05f7-401c-b338-9e102c33d9ab

Author: jayresearcher

src/index.ts

@@ -20,8 +20,21 @@ export interface NodeQConfig {
   onDataTransformed?: (result: any) => void;
 }
 
-type InternalConfig = Required<NodeQConfig> & {
+type InternalConfig = {
+  container: string | HTMLElement;
+  data: any;
+  width: number;
+  height: number;
   theme: Required<Theme>;
+  interactive: boolean;
+  zoomable: boolean;
+  collapsible: boolean;
+  nodeSpacing: number;
+  levelSpacing: number;
+  onNodeClick: (node: MindMapNode) => void;
+  onNodeHover: (node: MindMapNode) => void;
+  onPipelineCreated?: (pipeline: PipelineConfig) => void;
+  onDataTransformed?: (result: any) => void;
 };
 
 export class NodeQMindMap {

src/mindmap.ts

@@ -116,9 +116,9 @@ export class NodeQMindMap {
       .enter()
       .append('path')
       .attr('class', 'link')
-      .attr('d', d3.linkHorizontal<d3.HierarchyPoint<MindMapNode>>()
-        .x(d => d.y)
-        .y(d => d.x))
+      .attr('d', d3.linkHorizontal()
+        .x((d: any) => d.y)
+        .y((d: any) => d.x))
       .style('fill', 'none')
       .style('stroke', this.config.theme.linkColor)
       .style('stroke-width', '2px');
@@ -130,7 +130,13 @@ export class NodeQMindMap {
           this.config.onNodeClick(d.data);
           if (this.config.collapsible) {
             // Toggle children visibility
-            d.children = d.children ? (d.depth === 0 ? null : d.children) : this.hasChildren(d) ? this.getChildren(d) : null;
+            if (d.children) {
+              (d as any)._children = d.children;
+              d.children = undefined;
+            } else if ((d as any)._children) {
+              d.children = (d as any)._children;
+              (d as any)._children = undefined;
+            }
             this.render(); // Re-render on collapse/expand
           }
         })
@@ -145,7 +151,7 @@ export class NodeQMindMap {
 
     // Zooming
     if (this.config.zoomable) {
-      const zoom = d3.zoom<SVGSVGElement>()
+      const zoom = d3.zoom<SVGSVGElement, unknown>()
         .scaleExtent([0.1, 5])
         .on('zoom', (event) => {
           g.attr('transform', event.transform);