Type-Safe Error Handling in Swift 6: A Layered Approach

Swift 6 introduces typed throws, making error handling more type-safe. This post details a user-friendly layered error model using a custom `SystemError` protocol. This protocol includes properties like `logMessage`, `userFriendlyMessage`, and `underlyingErrors`, and provides recursive functions for looking up error types and generating error stacks. The article demonstrates defining custom error objects using structs and enums, handling Foundation errors, and decoding errors. Examples showcase leveraging typed throws and custom error handling to improve the reliability of Swift projects.