Can map a string literal type as key name in typescript?

Question

I'm wondering if could map a string literal type as a key in new type.

I tried but it's not right.

const a = {
  type: "key",
  actions: {
    a() {},
    b() {},
  },
} as const;

/* Map to
{
  key: {
    a() {},
    b() {},
  }
}
*/

type A = typeof a

type T = {
  A['type']: A['actions']
  // 'A' only refers to a type, but is being used as a value here.ts(2693)
}

Answer 1

You can like this:

type T = {
  [K in A['type']]: A['actions']
}

TS Playground