Unfinished Types

[mavericken]

I think there should be a way to describe a type that is finished for the properties that are defined, but unfinished for properties that are not defined.

Example Use Case:

unfinished interface FancyAPI {
  version: number,
  endpointURL: string
}

var test:FancyAPI = getFancyAPI();
test.version = "test" // should have an error here
test.endpointName = "localhost/fancyAPI" // should have no error here
test.someExtraInformation = "extra info" // should have no error here, should be type any

Really why I would want this is so I can incrementally build a type definition for code that previously had no type information.

[RyanCavanaugh]

What you're asking for is effectively #12596

[mavericken]

Ah, sorry for the duplicate-- it is tricky to find these things with such a large pile of issues. I like the feature as proposed in #12596 more.