How are the TypeScript Partial and Required types implemented?

I find it important to know how the most-used TypeScript utility types are implemented.
Here, we see the implementation of the Partial
(all properties of a type are optional) and Required
(all properties of a type are required) types.
Knowing this is essential because it allows you to customize or create a new behavior for your use cases.
keyof Person
generates a union of the keys of Person, sokeyof Person
results in"id" | "name"
.[key in keyof Person]
iterates over each key in that union.Person[key]
is the type of the property in Person associated with the key, so "id" is a number, and "name" is a string.- The
?
modifier makes the property optional (used for thePartial
type), while the-?
modifier removes the optional modifier from the property, making it required (used for theRequired
type).
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