From d714cf3c8ca30b4372b6b138305f227a14f24506 Mon Sep 17 00:00:00 2001
From: Nikaru <nikaru@rango.exchange>
Date: Sat, 23 Nov 2024 13:29:52 +0000
Subject: [PATCH] feat: add chain change subscribe to evm namespace

---
 wallets/core/src/namespaces/evm/actions.ts | 32 ++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/wallets/core/src/namespaces/evm/actions.ts b/wallets/core/src/namespaces/evm/actions.ts
index 6156f77e8..076b8e58d 100644
--- a/wallets/core/src/namespaces/evm/actions.ts
+++ b/wallets/core/src/namespaces/evm/actions.ts
@@ -95,3 +95,35 @@ export function changeAccountSubscriber(
     },
   ];
 }
+
+export function changeChainSubscriber(
+  instance: () => ProviderAPI
+): [Subscriber<EvmActions>, SubscriberCleanUp<EvmActions>] {
+  let eventCallback: EIP1193EventMap['chainChanged'];
+
+  return [
+    (context) => {
+      const evmInstance = instance();
+
+      if (!evmInstance) {
+        throw new Error(
+          'Trying to subscribe to your EVM wallet, but seems its instance is not available.'
+        );
+      }
+
+      const [, setState] = context.state();
+
+      eventCallback = async (chainId: string) => {
+        setState('network', chainId);
+      };
+      evmInstance.on('chainChanged', eventCallback);
+    },
+    () => {
+      const evmInstance = instance();
+
+      if (eventCallback && evmInstance) {
+        evmInstance.removeListener('chainChanged', eventCallback);
+      }
+    },
+  ];
+}