diff --git a/src/mappings/utils/tokenUtils.ts b/src/mappings/utils/tokenUtils.ts
index 09331fa..3f7bbf4 100644
--- a/src/mappings/utils/tokenUtils.ts
+++ b/src/mappings/utils/tokenUtils.ts
@@ -130,21 +130,21 @@ export function getErc20TemplateId(address: Address): BigInt {
   return BigInt.zero()
 }
 
-declare const hardCodedContractData: {
-  [key: string]: {
-    token: string;
-    secondsPerEpoch: i32;
-    secondsPerSubscription: i32;
-    truevalSubmitTimeout: i32;
-    stakeToken: string;
-    txId: string;
-    timestamp: i32;
-    block: i32;
-    eventIndex: i32;
-  };
+type ContractData = {
+  token: string;
+  secondsPerEpoch: i32;
+  secondsPerSubscription: i32;
+  truevalSubmitTimeout: i32;
+  stakeToken: string;
+  txId: string;
+  timestamp: i32;
+  block: i32;
+  eventIndex: i32;
 };
 
-const hardCodedContractData = {
+type HardCodedContractDataType = { [key: string]: ContractData };
+
+const hardCodedContractData: HardCodedContractDataType = {
   "0x18f54cc21b7a2fdd011bea06bba7801b280e3151": {
     "token": "0x18f54cc21b7a2fdd011bea06bba7801b280e3151",
     "secondsPerEpoch": 300,