fix: build errors

Author: xrdavies

front-end/src/global.d.ts

@@ -0,0 +1,19 @@
+/**
+ * Global type declarations for Ethereum provider
+ */
+
+interface EthereumProvider {
+  isMetaMask?: boolean;
+  isCoinbaseWallet?: boolean;
+  providers?: EthereumProvider[];
+  request: (args: { method: string; params?: any[] }) => Promise<any>;
+  on?: (event: string, handler: (...args: any[]) => void) => void;
+  removeListener?: (event: string, handler: (...args: any[]) => void) => void;
+  selectedAddress?: string | null;
+  chainId?: string;
+}
+
+interface Window {
+  ethereum?: EthereumProvider;
+  coinbaseWalletExtension?: EthereumProvider;
+}