Method buildChildren

ui/src/protocol/message-processor.ts:715–786

* Build children from ComponentArrayReference * In streaming mode, tracks pending child components that are not yet defined

(
    props: Record<string, unknown>,
    surface: Surface,
    visited: Set<string>,
    streamingState?: StreamingState,
  )

   * In streaming mode, tracks pending child components that are not yet defined
   */
  private buildChildren(
    props: Record<string, unknown>,
    surface: Surface,
    visited: Set<string>,
    streamingState?: StreamingState,
  ): AnyComponentNode[] {
    const childrenRef = props.children as ComponentArrayReference | undefined;
    if (!childrenRef) {
      return [];
    }

    const children: AnyComponentNode[] = [];

    // Handle explicit list
    if (childrenRef.explicitList) {
      for (const childId of childrenRef.explicitList) {
        const childDef = surface.components.get(childId);
        if (!childDef) {
          // In streaming mode, track pending components
          if (streamingState) {
            streamingState.pendingComponentIds.add(childId);
            streamingState.isStreaming = true;
          }
          console.warn(`Child component ${childId} not found. Skipping.`);
          continue;
        }
        const childNode = this.buildComponentNode(childDef, surface, visited, streamingState);
        if (childNode) {
          children.push(childNode);
        }
      }
    }

    // Handle template
    if (childrenRef.template) {
      const { componentId, dataBinding } = childrenRef.template;
      const templateDef = surface.components.get(componentId);
      if (!templateDef) {
        // In streaming mode, track pending template component
        if (streamingState) {
          streamingState.pendingComponentIds.add(componentId);
          streamingState.isStreaming = true;
        }
        console.warn(`Template component ${componentId} not found.`);
        return children;
      }

      // Get data array from binding
      const dataArray = getData(surface.dataModel, dataBinding);
      if (!Array.isArray(dataArray)) {
        return children;
      }

      // Create instance for each data item
      for (let i = 0; i < dataArray.length; i++) {
        const itemPath = `${dataBinding}/${i}`;
        const childNode = this.buildTemplateInstance(
          templateDef,