How to let third-party enum confirm CasePathable

[marcuswu0814]

In latest version, the extract(case:from:) be deprecated, if I want to extract a third-party enum, what’s is the alternative way to do? 🙏

Seems not possible to add macro with extension like this:

@CasePathable
extension ThirdPartyEnum {} // Error: 'extension' macro cannot be attached to extension

[stephencelis]

Hi @marcuswu0814! It's not possible to apply a macro to define such a conformance, but it is possible to define it from scratch for types you don't own. For example, the library defines CasePathable conformances for the Optional and Result types: https://github.com/pointfreeco/swift-case-paths/blob/main/Sources/CasePaths/Result%2BCasePathable.swift

We also define a bunch of manual conformances in the Composable Architecture.