testImmutable.js

// @flow
import {Record} from 'immutable';

const TestRec = Record({a: 0, b: 0});

// Flow gives an error for the `rec` argument's type:
//
//   RecordClass
//   Ineligible value used in/as type annotation (did you forget 'typeof'?)
//   TestRec
//
// Am I doing it wrong? Is there a type that can be used here? `typeof TestRec`
// does not work, nor do any other variations I've tried.
function handleRec(rec: TestRec) {
  console.log(rec.a);
}

const myRec = TestRec();
handleRec(myRec);