How to create a type union based on a function return value

[frosty ravine]

I have this function

function parseControllerName(name: string) {
    return lowerFirst(name.replace('Controller', ''))
}

and I have an Object which is something like

{
  AccountController: controllers.AccountController,
  AuthController: controllers.AuthController,
  ...
}

I want to make a type that would parse all of these Object keys through parseControllerName method so the type becomes this

{
  account: controllers.AccountController,
  auth: controllers.AuthController,
  ...
}

[odd frost]

you could make the function generic to use it for transforming types but imo that seems kinda excessive. you could do the transformation with just normal type transformations too

[frosty ravine]

Could you show an example, just so Im sure that I understand what you mean