Building Type-Safe Metrics API in Swift: Part II
Blog post from Sentry
In the second part of a series on designing type-safe Swift APIs, the focus is on enhancing the Metrics API by integrating attributes as key-value pairs with supported data types, moving away from the use of Any to prevent unusable data. The article explores how to build a protocol-based "union type" that only accepts valid values, while addressing Swift compiler limitations and ensuring future-proofing with features like the @unknown default. The solution involves defining a SentryAttributeContent enum for known types and adopting a protocol, SentryAttributeValue, to ensure type-safety and ease of use. This approach leverages Swift's type system to create an API that prevents invalid inputs at compile time, supports custom types, and remains adaptable to future updates, though it currently limits usage to Swift-only environments. The API is available in sentry-cocoa v9.4.0, with future plans for an Objective-C wrapper.
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