possible definition?

src/lib/motion-start/animation/utils/is-animatable.ts

@@ -3,8 +3,8 @@ based on [email protected],
 Copyright (c) 2018 Framer B.V.
 */
 
-import { complex } from 'style-value-types';
-// import { complex } from "../../value/types/complex"
+// import { complex } from 'style-value-types';
+import { complex } from "../../value/types/complex"
 import type { ValueKeyframesDefinition } from '../types';
 
 /**

src/lib/motion-start/components/AnimatePresence/utils.ts

@@ -3,13 +3,34 @@ based on [email protected],
 Copyright (c) 2018 Framer B.V.
 */
 
+import type { Snippet } from 'svelte';
 import { writable } from 'svelte/store';
+import type { ConditionalGeneric } from '.';
 
 export const Children$ = writable<{ key: string }[]>();
 
 export type ComponentKey = number | undefined;
 
-export const getChildKey = (child: { key: number | undefined }): ComponentKey => child.key || undefined;
+export const getChildKey = (child: {
+    key: ComponentKey;
+}): ComponentKey =>
+     child.key || undefined;
+
+function isSvelteComponent(thing: { prototype: { $destroy: any; }; render: any; }) {
+    return (thing && typeof window !== 'undefined')
+      ? typeof thing.prototype.$destroy === 'function' // client-side
+      : typeof thing.render === 'function'; // server-side
+  }
+export function onlyElements(children: Snippet<[ConditionalGeneric<any> | {
+    key: number;
+}]>[] | undefined): Snippet<any>[] {
+	const filtered: Snippet<any>[] = []
+    children?.forEach((child:any) => {
+        if (isSvelteComponent(child)) filtered.push(child)
+    })
+
+    return filtered
+}
 
 // export function onlyElements(children: (Element & { key: number })[]): (Element & { key: number })[] {
 // 	return children.filter();