handle rpc errors better

Author: arcoraven

src/utils/error.ts

@@ -27,12 +27,24 @@ export const prettifyError = async (
   return error.message;
 };
 
-export const isNonceAlreadyUsedError = (error: unknown) =>
-  (error instanceof Error &&
-    error.message.toLowerCase().includes("nonce too low")) ||
-  isEthersErrorCode(error, ethers.errors.NONCE_EXPIRED);
+const _parseMessage = (error: unknown): string | null => {
+  return error && typeof error === "object" && "message" in error
+    ? (error.message as string).toLowerCase()
+    : null;
+};
+
+export const isNonceAlreadyUsedError = (error: unknown) => {
+  const message = _parseMessage(error);
+  if (message) {
+    return message.includes("nonce too low");
+  }
+  return isEthersErrorCode(error, ethers.errors.NONCE_EXPIRED);
+};
 
-export const isReplacementGasFeeTooLow = (error: unknown) =>
-  (error instanceof Error &&
-    error.message.toLowerCase().includes("replacement fee too low")) ||
-  isEthersErrorCode(error, ethers.errors.REPLACEMENT_UNDERPRICED);
+export const isReplacementGasFeeTooLow = (error: unknown) => {
+  const message = _parseMessage(error);
+  if (message) {
+    return message.includes("replacement fee too low");
+  }
+  return isEthersErrorCode(error, ethers.errors.REPLACEMENT_UNDERPRICED);
+};