fix: localhost scopes for legacy-evm (#250)

Author: wenfix

playground/browser-playground/CHANGELOG.md

@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Added
+
+- Add global `localhost` scopes ([#250](https://github.com/MetaMask/connect-monorepo/pull/250))
+
 ## [0.6.0]
 
 ### Changed

playground/browser-playground/src/App.tsx

@@ -23,7 +23,11 @@ global.Buffer = Buffer;
 const CONNECT_AND_SIGN_MESSAGE = 'Hello from MetaMask Connect Playground!';
 
 function App() {
-  const [customScopes, setCustomScopes] = useState<string[]>(['eip155:1']);
+  const [customScopes, setCustomScopes] = useState<string[]>(
+    window.location.hostname === '127.0.0.1' || window.location.hostname === 'localhost'
+      ? ['eip155:1337']
+      : ['eip155:1'],
+  );
   const [caipAccountIds, setCaipAccountIds] = useState<CaipAccountId[]>([]);
 
   const [wagmiError, setWagmiError] = useState<Error | null>(null);

playground/browser-playground/src/sdk/LegacyEVMSDKProvider.tsx

@@ -75,6 +75,7 @@ export const LegacyEVMSDKProvider = ({
               'eip155:5': 'https://goerli.infura.io/v3/demo',
               'eip155:11155111': 'https://sepolia.infura.io/v3/demo',
               'eip155:137': 'https://polygon-rpc.com',
+              'eip155:1337': 'http://127.0.0.1:8545',
             };
         const supportedNetworks = convertCaipToHexKeys(caipNetworks);
 

playground/playground-ui/src/constants/networks.ts

@@ -15,6 +15,7 @@ export const FEATURED_NETWORKS = {
   'zkSync Era Mainnet': 'eip155:324',
   'Base Mainnet': 'eip155:8453',
   'Solana Mainnet': 'solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp',
+  'Localhost 8545': 'eip155:1337',
 } as const;
 
 /**