Partial
Partial<T> returns a type that has the same properties as T but all of them are optional. This is most useful when the strictNullChecks flag is enabled. Partial works on a single level, meaning it doesn’t affect nested objects. A good use case for Partial is when you need to type a function that lets you override default values of properties of some object.
As you can see, Partial is defined in a similar way to Readonly. Instead of the readonly modifier, the optionality modifier ? is appended to each property of T.
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