Can we avoid the repetition of String enum value?

Question

I'm using this code:

type Group = {
  [key in ROLES]?: string;
};

enum ROLES {
  simple = "simple",
  admin = "admin",
}

Is there a way to avoid the "repetition" of simple = "simple"/admin = "admin"?

Can we have simply:

enum ROLES {
  simple,
  admin,
}

user_8613630 · Answer

Yes, the enum you declared is valid TypeScript. But instead of strings, this enum contains numbers and is equivalent to:

enum ROLES {
  simple = 0,
  admin = 1,
}

But you can still extract the key names from ROLES to build the Group type.

type Group = {
  [key in `${keyof typeof ROLES}`]?: string;
};