Use onError to change an application error into a TRPCError?

I want to use the onError handler to change any instance of a custom application error into a TRPCError (I want the HTTP Status code to be a 401 rather than a 500). I tried this but it doesn't work...

  onError({error}) {
    if (error instanceof AccountLimitError){
      error = new TRPCError({ code: 'UNAUTHORIZED', message:error.message })
    }
  }

  onError({error}) {
    if (error instanceof AccountLimitError){
      error = new TRPCError({ code: 'UNAUTHORIZED', message:error.message })
    }
  }

  onError({error}) {
    if (error instanceof AccountLimitError){
      error = new TRPCError({ code: 'UNAUTHORIZED', message:error.message })
    }
  }

  onError({error}) {
    if (error instanceof AccountLimitError){
      error = new TRPCError({ code: 'UNAUTHORIZED', message:error.message })
    }
  }

nor does this

  onError({error}) {
    if (error instanceof AccountLimitError){
      const trpcError = new TRPCError({ code: 'UNAUTHORIZED', message:error.message })
      error = Object.assign(error, trpcError)
    }
  }

  onError({error}) {
    if (error instanceof AccountLimitError){
      const trpcError = new TRPCError({ code: 'UNAUTHORIZED', message:error.message })
      error = Object.assign(error, trpcError)
    }
  }

  onError({error}) {
    if (error instanceof AccountLimitError){
      const trpcError = new TRPCError({ code: 'UNAUTHORIZED', message:error.message })
      error = Object.assign(error, trpcError)
    }
  }

  onError({error}) {
    if (error instanceof AccountLimitError){
      const trpcError = new TRPCError({ code: 'UNAUTHORIZED', message:error.message })
      error = Object.assign(error, trpcError)
    }
  }

I can set individual properties on the error object like error.message but thought there might be an easier way. Has anybody got a nifty hack for this?

Use onError to change an application error into a TRPCError?

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