Utility Types

	TypeScript	Notes
Keys	keyof T
Values	T[keyof T]
Readonly	Readonly<T>
Exact	T
Class	typeof T
Subtype	B extends A
Shape	Partial<T>	Makes all properties optional.
Required	Required<T>	Makes all properties required.
Return type	ReturnType<T>, ReturnType<typeof someFunction>
Property type	T[k]
Element type	T[k]
Rest	Exclude<A, B>
Difference / Omit	Pick<A, Exclude<keyof A, B>>	Omit is a type as of version 3.5
Pick	Pick<T, T[k]>	Useful when typing defaultProps (don't use Partial to type defaultProps). Example: const defaultProps: Pick<ComponentProps, 'key1' | 'key2'> = {...};