Typescript makes it convenient to roll your own type- `let draft : Partial<Foo>;` says that 'draft' is shaped like a Foo, EXCEPT all of the fields are optional

Typescript makes it convenient to roll your own type- `let draft : Partial<Foo>;` says that 'draft' is shaped like a Foo, EXCEPT all of the fields are optional. If you try to access a field on draft that doesn't exist on Foo, it's a ts error. If you try to pass draft to a function that takes a Foo, it's a type mismatch.