[NO CHANGELOG][Add Funds Widget] Add convertTokenBalanceToUsd function (

#2234)

packages/checkout/widgets-lib/src/widgets/add-funds/functions/convertTokenBalanceToUsd.ts

@@ -0,0 +1,20 @@
+import { TokenBalance } from '@0xsquid/sdk/dist/types';
+import { RouteResponse } from '@0xsquid/squid-types';
+import { ethers } from 'ethers';
+
+export function convertTokenBalanceToUsd(
+  balance: TokenBalance,
+  routeResponse: RouteResponse,
+): number {
+  const { usdPrice } = routeResponse.route.estimate.fromToken;
+
+  if (!usdPrice) {
+    throw new Error('USD conversion rate not available');
+  }
+
+  const tokenBalance = ethers.utils.formatUnits(balance.balance, balance.decimals);
+
+  const usdBalance = parseFloat(tokenBalance) * usdPrice;
+
+  return usdBalance;
+}