gistfile1.txt

let MyClassRecord = Immutable.Record({
    property: 'defaultValue',
    index: 0,
    works: true,
    valueList: Immutable.List<string>([])
});

export class MyClass extends MyClassRecord {
    property:string;
    index:number;
    truth:boolean;
    valueList:Immutable.List<string>
}

let c = new MyClass();