1.1.0

• Now TypeScript native! (flow usage still supported ❤️)
• Leverages the new TypeScript@3.7 asserts keyword to correctly narrow types (caused a feature release)

const user: Person | null = getPerson();
invariant(user, 'expected user to be populated');
    
// the type of `user` is now narrowed to 'Person' rather than `Person | null`