CODEWITHSUNDEEP
typescript
user1935987
user1935987

Reputation: 3347

Typescript pass enum class constructor argument

Most likely it must be a very simple issue, but i can't understand why i can't initialize a class instance with enum parameter.

Error: Argument type {type: MessageTypes} is not assignable to parameter type MessageTypes

class:

export enum MessageTypes {
  STATUS,
  CONTROL
}
export enum MessageStatus {
  OK,
  ERROR
}
export enum MessageCommands {
  REQUEST_STATUS_ALL
}


export class Message {
  type: MessageTypes;
  status?: MessageStatus;
  command?: MessageCommands;
  body?: any;

  constructor(type: MessageTypes, command?: MessageCommands, status?: MessageStatus, body?: any) {
    this.type = type;
    this.status = status;
    this.command = command;
    this.body = body;
  }
}

usage: const msg = new Message({type: MessageTypes.CONTROL});

Upvotes: 0

Views: 460

Answers (1)

Peter Olson
Peter Olson

Reputation: 142947

It looks like you want your constructor to accept an object containing a type property:

constructor(settings : { type: MessageTypes, command?: MessageCommands, status?: MessageStatus, body?: any}) {
    this.type = settings.type;
    this.status = settings.status;
    this.command = settings.command;
    this.body = settings.body;
}

Either that or don't pass in an object, and just pass the type as the first argument.

const msg = new Message(MessageTypes.CONTROL);

If you want to skip some of the arguments, you can just pass in null or undefined for the arguments that you don't need:

const msg = new Message(MessageTypes.CONTROL, null, MessageStatus.OK)

Upvotes: 2

Related Questions