Did you know that TypeScript comes with a bunch of built-in string manipulator types? That means we can easily transform a string type into uppercase, lowercase, or capitalized versions of itself. When might this be useful? In lots of situations where you have a fixed set of string values, for example, whenever you have a set of strings from an object using something like keyof.
To transform a string into a different version by defining a new type along with one of the type manipulators. For example, below, we transform myType into the capitalized version: