Property 'cause' does not exist on type 'Json & ExactOptionalGuard'

[Taewa]

Hi,
My main purpose of using serializeError is to get cause. it works perfectly but I get a following error

Property 'cause' does not exist on type 'Json & ExactOptionalGuard'.

What would be the appropriate type of it? My code is below:

const err = serializeError(e); // 'e' from smart contract error
const cause = err?.data?.cause?.reason; // Property 'cause' does not exist on type 'Json & ExactOptionalGuard'

[mcmire]

Hi @Taewa, it's possible for data to not contain a cause property, so you have to check for the existence of this property first before attempting to access it.

[0xelisa]

@Taewa this is what I did and seems to work:

 .catch((e: any) => {
 const serializedError = serializeError(e) as SerializedError;
 const errorData = serializedError.data as MetaMaskErrorData; // Type assertion here
 if (errorData?.cause) {
 console.log("Serialized RPC Error:", errorData.cause.reason);
 }
 console.log(e.code);
 });

 create these interfaces:

 interface MetaMaskErrorData {
 cause?: {
 [key: string]: any; // Using an index signature for flexibility
 };
 [key: string]: any; // Allow for other dynamic properties
}

interface SerializedError {
 code: number;
 message: string;
 data?: MetaMaskErrorData;
}

Hope this helps :)

[rekmarks]

@legobeat should we consider this closed?

[mcmire]

Closing this ticket. Please open a new ticket if you are still experiencing issues.