Weird type mapping thing

some-action-types.ts

// With template literal types this kind of thing is a breeze! 
type RootActionPrefix = 'auth';
type ActionType = 'LOGIN' | 'LOGOUT';
type RootActionTypes = `${RootActionPrefix}/${ActionType}`;


// Is there any sort of mapped-type magic that would let me
// turn this...
type AuthActions = 
  | { type: 'LOGIN'; user: UserNoPassword }
  | { type: 'LOGOUT' };


// ...into this?
type RootAuthActions =
  | { type: 'auth/LOGIN'; user: UserNoPassword }
  | { type: 'auth/LOGOUT' };