Typescript: Infer exact values from dynamically created object

Question

Is there a way to infer the exact values from an object thats dynamically created with a helper function.

The values of the object will always be inferred as type string, but I would like to have their exact value, like my attempt at casting on the SIGN_IN declaration.

const createAsyncActionTypes = (label: string) => ({
  REQUEST: `${label}_${'SUCCESS'}`,
  SUCCESS: `${label}_${'SUCCESS'}`,
  ERROR: `${label}_${'ERROR'}`,
  CANCELLED: `${label}_${'CANCELLED'}`,
});

const SIGN_OUT = createAsyncActionTypes('SIGN_OUT');

const SIGN_IN: {
  REQUEST: 'SIGN_IN_REQUEST';
  SUCCESS: 'SIGN_IN_SUCCESS';
  ERROR: 'SIGN_IN_ERROR';
  CANCELLED: 'SIGN_IN_CANCELLED';
} = createAsyncActionTypes('SIGN_IN');

Answer 1

No, that's not possible.

You could cast the individual values to their related types, but that would defeat the point of dynamically creating the object:

Typescript does not support "dynamic typing" like that.