WIP: migrated store and useSvelteFlow hook to signals & solved state propagation for provider

packages/svelte/src/lib/hooks/derivedWarning.svelte.ts

@@ -0,0 +1,19 @@
+import { key } from '$lib/store';
+import type { StoreContext } from '$lib/store/types';
+import { getContext } from 'svelte';
+
+export function derivedWarning(functionName: string) {
+  const storeContext = getContext<StoreContext>(key);
+
+  if (!storeContext) {
+    throw new Error(
+      `In order to use ${functionName}() you need to wrap your component in a <SvelteFlowProvider />`
+    );
+  }
+
+  if (storeContext.provider && !$effect.tracking()) {
+    console.warn(
+      `Use $derived(${functionName}()), when not calling inside a child of the <SvelteFlow /> component.`
+    );
+  }
+}