feat: hook for getting all configured chain IDs (#88)

.changeset/witty-seals-punch.md

@@ -0,0 +1,5 @@
+---
+"@reactive-dot/react": minor
+---
+
+Add hook for getting all configured chain IDs.

packages/react/src/hooks/use-chain-id.ts

@@ -1,13 +1,24 @@
 import { ChainIdContext } from "../contexts/index.js";
+import { chainConfigsAtom } from "../stores/config.js";
 import type { ChainHookOptions } from "./types.js";
 import { type ChainId, ReDotError } from "@reactive-dot/core";
+import { useAtomValue } from "jotai";
 import { useContext } from "react";
 
+/**
+ * Hook for getting all configured chain IDs.
+ *
+ * @returns All configured chain IDs
+ */
+export function useChainIds() {
+  return Object.keys(useAtomValue(chainConfigsAtom)) as ChainId[];
+}
+
 /**
  * Hook for getting the current chain ID.
  *
  * @param options - Additional options
- * @returns
+ * @returns The current chain ID
  */
 export function useChainId<
   const TAllowList extends ChainId[],