While working with a React-Query mutation, I encountered an issue where my component displays an error message but TypeScript does not recognize the mutation.error property as type Error:
if (mutation.isError){
console.log(mutation.error.message); // Property 'message' does not exist on type 'unknown'.
console.log((mutation.error as Error).message); // works
}
Is there a way to explicitly inform TypeScript that mutation.error is of type Error object?
In order to effectively utilize useMutation, you need to specify the generics:
useMutation<MyData, Error>
However, I personally wouldn't go this route as errors can vary and not necessarily be instances of the Error object.
Instead of solely relying on the isError check, a better approach would be to use an instanceof check:
if (mutation.error instanceof Error){
console.log(mutation.error.message);
}
By doing so, you can accurately narrow down the type of error and access properties like .message.
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