refactor: code optimisation for erc20

Ticket: WIN-7914

Author: ArunBala-Bitgo

modules/bitgo/src/v2/coinFactory.ts

@@ -38,6 +38,8 @@ import {
   TaoTokenConfig,
   PolyxTokenConfig,
   JettonTokenConfig,
+  NetworkType,
+  BaseCoin,
 } from '@bitgo/statics';
 import {
   Ada,
@@ -903,8 +905,37 @@ export function getCoinConstructor(coinName: string): CoinConstructor | undefine
   }
 }
 
+export const buildEthLikeChainToTestnetMap = (): Record<string, string> => {
+  const map: Record<string, string> = {};
+
+  const mainnetCoinsByFamily = new Map<string, Readonly<BaseCoin>>();
+  coins.forEach((coin) => {
+    if (
+      coin.network.type === NetworkType.MAINNET &&
+      coin.features.includes(CoinFeature.SUPPORTS_ERC20) &&
+      !coin.isToken
+    ) {
+      mainnetCoinsByFamily.set(coin.family, coin);
+    }
+  });
+
+  // Iterate testnet coins once and lookup matching mainnet coin
+  /* TODO: remove ip coin here, once changes are tested and add remove other evm coins from switch block (Ticket: https://bitgoinc.atlassian.net/browse/WIN-7835) */
+  coins.forEach((coin) => {
+    if (coin.network.type === NetworkType.TESTNET && !coin.isToken && coin.family === 'ip') {
+      const mainnetCoin = mainnetCoinsByFamily.get(coin.family);
+      if (mainnetCoin) {
+        map[coin.name] = mainnetCoin.name;
+      }
+    }
+  });
+
+  return map;
+};
+
 // TODO: add IP token here and test changes (Ticket: https://bitgoinc.atlassian.net/browse/WIN-7835)
-const ethLikeChainToTestnetMap: Record<string, string> = {};
+const ethLikeChainToTestnetMap: Record<string, string> = buildEthLikeChainToTestnetMap();
+
 export function getTokenConstructor(tokenConfig: TokenConfig): CoinConstructor | undefined {
   if (tokenConfig.coin in ethLikeChainToTestnetMap) {
     return EthLikeErc20Token.createTokenConstructor(tokenConfig as EthLikeTokenConfig, {