From 07c1227f306d0efb9421d4bb77a774f92f5fcf45 Mon Sep 17 00:00:00 2001
From: Tom Meagher <tom@meagher.co>
Date: Thu, 25 Jul 2024 12:08:45 -0400
Subject: [PATCH] fix: #4169

---
 .changeset/orange-goats-rush.md           |  5 +++++
 packages/core/src/createConfig.ts         | 13 ++++++++++---
 packages/core/src/transports/connector.ts |  2 +-
 packages/core/src/utils/extractRpcUrls.ts |  8 ++++----
 4 files changed, 20 insertions(+), 8 deletions(-)
 create mode 100644 .changeset/orange-goats-rush.md

diff --git a/.changeset/orange-goats-rush.md b/.changeset/orange-goats-rush.md
new file mode 100644
index 0000000000..3d6bb907c3
--- /dev/null
+++ b/.changeset/orange-goats-rush.md
@@ -0,0 +1,5 @@
+---
+"@wagmi/core": patch
+---
+
+Fixed internal `extractRpcUrls` usage with `unstable_connector`.
diff --git a/packages/core/src/createConfig.ts b/packages/core/src/createConfig.ts
index 4429a4c3bb..55a95db43c 100644
--- a/packages/core/src/createConfig.ts
+++ b/packages/core/src/createConfig.ts
@@ -8,6 +8,7 @@ import {
   type Chain,
   type Client,
   createClient,
+  type EIP1193RequestFn,
   type ClientConfig as viem_ClientConfig,
   type Transport as viem_Transport,
 } from 'viem'
@@ -582,11 +583,17 @@ export type Connector = ReturnType<CreateConnectorFn> & {
   uid: string
 }
 
-export type Transport = (
-  params: Parameters<viem_Transport>[0] & {
+export type Transport<
+  type extends string = string,
+  rpcAttributes = Record<string, any>,
+  eip1193RequestFn extends EIP1193RequestFn = EIP1193RequestFn,
+> = (
+  params: Parameters<
+    viem_Transport<type, rpcAttributes, eip1193RequestFn>
+  >[0] & {
     connectors?: StoreApi<Connector[]> | undefined
   },
-) => ReturnType<viem_Transport>
+) => ReturnType<viem_Transport<type, rpcAttributes, eip1193RequestFn>>
 
 type ClientConfig = LooseOmit<
   viem_ClientConfig,
diff --git a/packages/core/src/transports/connector.ts b/packages/core/src/transports/connector.ts
index 9f52336796..0f03d43188 100644
--- a/packages/core/src/transports/connector.ts
+++ b/packages/core/src/transports/connector.ts
@@ -30,7 +30,7 @@ export type ConnectorTransport = Transport
 export function unstable_connector(
   connector: Pick<Connector, 'type'>,
   config: ConnectorTransportConfig = {},
-): Transport {
+): Transport<'connector'> {
   const { type } = connector
   const { key = 'connector', name = 'Connector', retryDelay } = config
 
diff --git a/packages/core/src/utils/extractRpcUrls.ts b/packages/core/src/utils/extractRpcUrls.ts
index 2fab6c0657..a617eac13c 100644
--- a/packages/core/src/utils/extractRpcUrls.ts
+++ b/packages/core/src/utils/extractRpcUrls.ts
@@ -12,8 +12,8 @@ export function extractRpcUrls(parameters: ExtractRpcUrlsParameters) {
   if (!parameters.transports) return [fallbackUrl]
 
   const transport = parameters.transports?.[chain.id]?.({ chain })
-  const transports = transport?.value?.transports || [transport]
-  return transports.map(
-    ({ value }: { value: { url: string } }) => value.url || fallbackUrl,
-  )
+  const transports = (transport?.value?.transports as NonNullable<
+    typeof transport
+  >[]) || [transport]
+  return transports.map(({ value }) => value?.url || fallbackUrl)
 }