TypeScript

Recently TypeScript wizard Matt Pocock made a Twitter thread on branded types. At first, I did not know what he was talking about, I thought it was a new TypeScript feature being introduced in TypeScript 5 but upon closer look, I realized that it was not a new feature but rather a technique that I already knew, opaque types. I first learned about opaque types from Evert Pot in his blog post Implementing an opaque type in typescript, though I guess now the TypeScript community prefers to call them branded types, the name doesn’t matter, the problem being solved is the same, preventing types from being interchangeable. ...