Allow empty constructur call in expected class declaration

[vanniktech]

Using 1.0.1 the following gets flagged:

@OptIn(ExperimentalMultiplatform::class)
@OptionalExpectation
@Target(AnnotationTarget.CLASS)
@Retention(AnnotationRetention.BINARY)
expect annotation class Parcelize()

@OptIn(ExperimentalMultiplatform::class)
@OptionalExpectation
@Target(AnnotationTarget.PROPERTY)
@Retention(AnnotationRetention.SOURCE)
expect annotation class IgnoredOnParcel()

@OptIn(ExperimentalMultiplatform::class)
@OptionalExpectation
@Retention(AnnotationRetention.SOURCE)
@Repeatable
@Target(AnnotationTarget.CLASS, AnnotationTarget.PROPERTY)
expect annotation class TypeParceler<T, P : Parceler<in T>>()

with:

commonParcelableApi.kt:11:34: No parenthesis expected (standard:class-signature)
commonParcelableApi.kt:17:40: No parenthesis expected (standard:class-signature)
commonParcelableApi.kt:24:60: No parenthesis expected (standard:class-signature)

And the formatting removes the () however this causes a compilation error: e: Color.kt:35:2 This class does not have a constructor

You can use vanniktech/ui#100 to repro

[paul-dingemans]

The problem seems to be caused by the expect. I am unfamiliar with it. I have found https://kotlinlang.org/api/latest/kotlin.test/kotlin.test/expect.html. Can you give more information why and how it is used?

[TWiStErRob]

It's not kotlin-test expect, but KMM's expect and actual.

https://kotlinlang.org/docs/multiplatform-expect-actual.html

TL;DR roughly:

• expect is like an interface declaration of API to be compiled against in common code
• actual is the implementation to be linked at compile time of platform-specific code

[paul-dingemans]

It's not kotlin-test expect, but KMM's expect and actual.

https://kotlinlang.org/docs/multiplatform-expect-actual.html

TL;DR roughly:

• expect is like an interface declaration of API to be compiled against in common code
• actual is the implementation to be linked at compile time of platform-specific code

Tnx. That is clarifying. If you stuck for now, you can either disable the class-signature rule entirely, or with a file annotation just only for the file in which the expect declaration is used.

[vanniktech]

Yup I already disabled the rule entirely. Luckily that one had no dependencies that I needed to disable as well, so all good!