Learning design with types

Implementing Scott Wlaschin's "Designing with types" series in TypeScript

Articles with FSharp code	TypeScript code
1. Introduction	step1
2. Single case union types	step2
3. Making illegal states unrepresentable	step3
4. Discovering new concepts	step4
5. Making state explicit	step5
6. Constrained strings	step6
7. Non-string types
8. Conclusion	conclusion