- let [messageType, messageId, commandName, commandPayload, errorDetails]: IncomingRequest = [0, '', '' as IncomingRequestCommand, '', ''];
- let responseCallback: (payload?, requestPayload?) => void;
+ let [messageType, messageId, commandName, commandPayload, errorDetails]: IncomingRequest = [0, '', '' as IncomingRequestCommand, '', {}];
+ let responseCallback: (payload?: Record<string, unknown> | string, requestPayload?: Record<string, unknown>) => void;