handle mainnetFallback when alchemy is absent

Author: technophile-04

packages/nextjs/services/web3/wagmiConfig.tsx

@@ -17,21 +17,22 @@ export const wagmiConfig = createConfig({
   connectors: wagmiConnectors(),
   ssr: true,
   client({ chain }) {
-    let rpcFallbacks = [http()];
-
-    const rpcOverrideUrl = (scaffoldConfig.rpcOverrides as ScaffoldConfig["rpcOverrides"])?.[chain.id];
     // Extra fallback for mainnet.
     const mainnetFallbackWithDefaultRPC = [http("https://mainnet.rpc.buidlguidl.com")];
+    let rpcFallbacks = [...(chain.id === mainnet.id ? mainnetFallbackWithDefaultRPC : []), http()];
+
+    const rpcOverrideUrl = (scaffoldConfig.rpcOverrides as ScaffoldConfig["rpcOverrides"])?.[chain.id];
+
     if (rpcOverrideUrl) {
-      rpcFallbacks = [http(rpcOverrideUrl), ...(chain.id === mainnet.id ? mainnetFallbackWithDefaultRPC : []), http()];
+      rpcFallbacks = [http(rpcOverrideUrl), ...rpcFallbacks];
     } else {
       const alchemyHttpUrl = getAlchemyHttpUrl(chain.id);
       if (alchemyHttpUrl) {
         const isUsingDefaultKey = scaffoldConfig.alchemyApiKey === DEFAULT_ALCHEMY_API_KEY;
         // If using default Scaffold-ETH 2 API key, we prioritize the default RPC
         rpcFallbacks = isUsingDefaultKey
-          ? [...(chain.id === mainnet.id ? mainnetFallbackWithDefaultRPC : []), http(), http(alchemyHttpUrl)]
-          : [http(alchemyHttpUrl), ...(chain.id === mainnet.id ? mainnetFallbackWithDefaultRPC : []), http()];
+          ? [...rpcFallbacks, http(alchemyHttpUrl)]
+          : [http(alchemyHttpUrl), ...rpcFallbacks];
       }
     }