feat(frontend-dapp): wagmi transport + env types for Chain 2138

- Optional http() transport for 2138 when VITE_ENABLE_CHAIN2138 set
- Document VITE_* 2138 vars in .env.example; augment vite-env.d.ts

Made-with: Cursor

frontend-dapp/.env.example

@@ -8,6 +8,11 @@ VITE_WALLETCONNECT_PROJECT_ID=your_reown_project_id_from_cloud_reown_com
 VITE_THIRDWEB_CLIENT_ID=your_thirdweb_client_id_here
 VITE_RPC_URL_138=https://rpc-http-pub.d-bis.org
 
+# Defi Oracle Meta Testnet (chain ID 2138) — off unless VITE_ENABLE_CHAIN2138 is true or 1
+# VITE_ENABLE_CHAIN2138=true
+# VITE_RPC_URL_2138=https://rpc.public-2138.defi-oracle.io
+# VITE_EXPLORER_URL_2138=https://public-2138.defi-oracle.io
+
 # Optional Environment Variables
 VITE_ETHERSCAN_API_KEY=YourApiKeyToken
 VITE_SAFE_SERVICE_URL=https://safe-transaction-mainnet.safe.global

frontend-dapp/src/config/wagmi.ts

@@ -4,6 +4,8 @@ import {
   allNetworks,
   chainRpcUrls,
   chain138,
+  chain2138Testnet,
+  chain2138TestnetEnabled,
   allMainnet,
   etherlink,
   bsc,
@@ -23,6 +25,9 @@ export const config = createConfig({
   ],
   transports: {
     [chain138.id]: http(chainRpcUrls[chain138.id]),
+    ...(chain2138TestnetEnabled
+      ? { [chain2138Testnet.id]: http(chainRpcUrls[chain2138Testnet.id]) }
+      : {}),
     [allMainnet.id]: http(chainRpcUrls[allMainnet.id]),
     [etherlink.id]: http(chainRpcUrls[etherlink.id]),
     [bsc.id]: http(chainRpcUrls[bsc.id]),

frontend-dapp/src/vite-env.d.ts

@@ -1,15 +1,21 @@
 /// <reference types="vite/client" />
 
-import { EventEmitter } from 'events';
+interface ImportMetaEnv {
+  readonly VITE_ENABLE_CHAIN2138?: string
+  readonly VITE_RPC_URL_2138?: string
+  readonly VITE_EXPLORER_URL_2138?: string
+}
+
+import { EventEmitter } from 'events'
 
 interface Window {
-  Buffer: typeof Buffer;
-  EventEmitter: typeof EventEmitter;
+  Buffer: typeof Buffer
+  EventEmitter: typeof EventEmitter
 }
 
 declare global {
-  var Buffer: typeof import('buffer').Buffer;
-  var EventEmitter: typeof import('events').EventEmitter;
+  var Buffer: typeof import('buffer').Buffer
+  var EventEmitter: typeof import('events').EventEmitter
 }
 
-export {};
+export {}