Use implementation-only imports in Frameworks

Question

Created Feb ’23

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We are implementing third party XCFrameworks for our clients. We are planning to use @_implementationOnly import in our SDK due to our framework pluggability requirement. We are skeptical about using this in our SDK due to the following warning.

https://github.com/apple/swift/blob/main/docs/ReferenceGuides/UnderscoredAttributes.md

Could you please confirm that if we use this @_implementationOnly import in our framework, do we get any problems when our Clients are submitting their apps to AppStore ?

Underscored Attributes Reference : WARNING: This information is provided primarily for compiler and standard library developers. Usage of these attributes outside of the Swift monorepo is STRONGLY DISCOURAGED.

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Answer 1

sagardagdufm OP

May ’23

Did you go ahead and use this attribute in your framework? I am also developing a framework in which I do not want to expose one of my dependencies to the client app and this seems the only way to do that, hence facing the same question!

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Answer 2

Eric-Yuan OP

Jul ’24

MarkdownUI uses this attribute, and I'm fairly certain other apps on the App Store use it as well.

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