Making a struct optional

Hello, if I want to make the author field optional, what do I have to do with this basic piece of code ?

https://github.com/ianstormtaylor/superstruct/blob/07caeb205bffbfc00759381ed84004c0ad4e9c8e/examples/composing-structs.js#L17

const Article = struct({
  id: 'number',
  title: 'string',
  created_at: 'date',
  published_at: 'date?',
  author: User,
})

What I would like to do is just add the question mark sign.

Thanks.

[mycaule]

Found the answer in the unit tests, here is the way to do it:

https://github.com/ianstormtaylor/superstruct/blob/master/test/fixtures/object-lists/property-optional.js#L6

struct.optional(User),

or another way

const User = struct.optional({
  id: 'number',
  name: 'string',
})

Maybe you will have to update the docs.

[ianstormtaylor]

Documented now!