Codable

Swift synthesizes additional code for Codable types that is not visible to Periphery and can result in false positives for properties not directly referenced from non-synthesized code.

If your project contains many such types, you can retain all properties on Codable types with --retain-codable-properties. Alternatively, you can retain properties only on Encodable types with --retain-encodable-properties.

If Codable conformance is declared by a protocol in an external module not scanned by Periphery, you can instruct Periphery to identify the protocols as Codable with --external-codable-protocols "ExternalProtocol". The equivalent option for protocols that inherit Encodable is --external-encodable-protocols.

In both cases, the properties and CodingKey enums of types conforming to the given protocols are retained.