Define a TypeScript interface that requires a complete enum to be provided as a parameter

In order to ensure that an enum definition is always passed, I am looking to create an interface with a specific requirement.

// msg.ts, showing an example enum called Messages
export enum Messages {
  A,
  B
}

// interfaces.d.ts
export interface IThingy {
  Messages: Messages
  // ^ how can I specify that Messages must be the entire enum, not just a member of it?
}

I want users to have seamless access to this enum as if it were injected. For instance:

function (param: IThingy) {
   param.Messages.A // works fine!
}

If direct injection is not feasible, what other method could I employ to achieve the same outcome? Ultimately, my goal is to pass around a constant, strongly-typed key-value (string:string) map.

I came across a similar discussion on Stack Overflow, but my intention here is quite distinct.

Answer №1

One way to accomplish this is by following these steps:

export enum Messages {
  A,
  B
}

function fn(param: typeof Messages) {
  console.log(param.A); // works fine!
}

fn(Messages);
fn(string); // won't work
// however, with Structural typing in play:
fn({A: 0, B: 1}); // it's possible!

It raises the question of why you would need to pass a specific enum when you can easily refer to it by its name. Creating a function that only accepts enums and nothing else, as pointed out in the referenced question, may not be feasible.

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