`number` -> `BigNumber`

packages/sdk/src/utils/message-utils.ts

@@ -58,12 +58,12 @@ export const migratedWithdrawalGasLimit = (
   const dataCost = BigNumber.from(hexDataLength(data)).mul(
     RELAY_PER_BYTE_DATA_COST
   )
-  let overhead: number
+  let overhead: BigNumber
   if (chainID === 420) {
-    overhead = 200_000
+    overhead = BigNumber.from(200_000)
   } else {
     // Constant overhead
-    overhead =
+    overhead = BigNumber.from(
       RELAY_CONSTANT_OVERHEAD +
         // Dynamic overhead (EIP-150)
         (MIN_GAS_DYNAMIC_OVERHEAD_NUMERATOR * 1_000_000) /
@@ -77,6 +77,7 @@ export const migratedWithdrawalGasLimit = (
         // Gas reserved for the execution between the `hasMinGas` check and the `CALL`
         // opcode. (Conservative)
         RELAY_GAS_CHECK_BUFFER
+    )
   }
 
   let minGasLimit = dataCost.add(overhead)