fix(core): ssr connected callback

Author: bennypowers

core/pfe-core/controllers/light-dom-controller.ts

@@ -1,4 +1,4 @@
-import type { ReactiveController, ReactiveElement } from 'lit';
+import { isServer, type ReactiveController, type ReactiveElement } from 'lit';
 
 import { Logger } from './logger.js';
 
@@ -52,9 +52,13 @@ export class LightDOMController implements ReactiveController {
    * Returns a boolean statement of whether or not this component contains any light DOM.
    */
   hasLightDOM(): boolean {
-    return !!(
-      this.host.children.length > 0
-      || (this.host.textContent ?? '').trim().length > 0
-    );
+    if (isServer) {
+      return false;
+    } else {
+      return !!(
+        this.host.children.length > 0
+        || (this.host.textContent ?? '').trim().length > 0
+      );
+    }
   }
 }

core/pfe-core/controllers/scroll-spy-controller.ts

@@ -44,7 +44,7 @@ export class ScrollSpyController implements ReactiveController {
   #rootMargin?: string;
   #threshold: number | number[];
 
-  #getRootNode: () => Node;
+  #getRootNode: () => Node | null;
   #getHash: (el: Element) => string | null;
 
   get #linkChildren(): Element[] {
@@ -92,7 +92,7 @@ export class ScrollSpyController implements ReactiveController {
     this.#rootMargin = options.rootMargin;
     this.#activeAttribute = options.activeAttribute ?? 'active';
     this.#threshold = options.threshold ?? 0.85;
-    this.#getRootNode = () => options.rootNode ?? host.getRootNode();
+    this.#getRootNode = () => options.rootNode ?? host.getRootNode?.() ?? null;
     this.#getHash = options?.getHash ?? ((el: Element) => el.getAttribute('href'));
   }
 

core/pfe-core/controllers/slot-controller.ts

@@ -191,8 +191,12 @@ export class SlotController implements ReactiveController {
   #getChildrenForSlot<T extends Element = Element>(
     name: string | typeof SlotController.default,
   ): T[] {
-    const children = Array.from(this.host.children) as T[];
-    return children.filter(isSlot(name));
+    if (isServer) {
+      return [];
+    } else {
+      const children = Array.from(this.host.children) as T[];
+      return children.filter(isSlot(name));
+    }
   }
 
   #initSlot = (slotName: string | null) => {