Implementing an opaque type in typescript

Implementing an opaque type in typescript

February 18, 2020 Implementing an opaque type in typescript Say, you’re in a situation where you ...概要を表示 February 18, 2020 Implementing an opaque type in typescript Say, you’re in a situation where you have a user type, that looks a bit as follows: export type User = { firtName: string; lastName: string; email: string; } function save(user: User) { // ... } const user = { firstName: 'Evert', lastName: 'Pot', email: '[email protected]', } save(user); But, instead of accepting any string for an email add