Super-Rough-Record-Class-Types.js

declare function Record(): any

const RecordInstance = Record({
})

class _Foo extends RecordInstance {}

exports.Foo = _Foo

declare class Foo {
  x: number;
  y: number;
}

function Foo(values): Foo {
  const val = new _Foo
  val.x = values.x
  val.y = values.y
  return (val: any)
}

Foo.prototype = Object.create(_Foo)

const foo: Foo = MakeFoo({ x: 1, y: 2 })