Support async/await

[AndrewBarba]

• Supports async/await in Swift 5.5 via a new value() async method on the promise
• Initialize a Promise with an async handler

Async Value

let user = await getUser().value()

Async Init

let promise = Promise<User> {
    return await getUserAsync()
}

Async chain

getUser()
    .then { await getFavorites(for: $0) }