An interface member. Overloads are consecutive `FsMethod` entries sharing a name - overloaded abstract members are legal F#. A construct signature of a *constructor object* - the thing `typeof Request` names, and the type of a `declare var Request: { new (...): Request }` (§4.4). F# has no first-class constructor-object type, so the object is declared as an interface of its own and each of its construct signatures becomes an `[]` `Create` member: `$0` is the object the member is read off, so `scope.Request.Create(url)` reaches JavaScript as `new scope.Request(url)` rather than as a call. The name is always `Create` - overloads are consecutive entries, exactly as methods are.