[Commonizer] typeAliasUtils: computeSuitableUnderlyingType: Consider commonized type-aliases

native/commonizer-api/test/org/jetbrains/kotlin/commonizer/CommonizeNativeDistributionTest.kt

@@ -65,6 +65,41 @@ class CommonizeNativeDistributionTest {
         )
     }
 
+    @Test
+    fun `commonize - apple platforms`() {
+        val iosTarget = CommonizerTarget(IOS_ARM64, IOS_X64, IOS_SIMULATOR_ARM64)
+        val watchosTarget = CommonizerTarget(WATCHOS_ARM64, WATCHOS_X64, WATCHOS_SIMULATOR_ARM64)
+        val macosTarget = CommonizerTarget(MACOS_X64, MACOS_ARM64)
+        val appleTarget = SharedCommonizerTarget(iosTarget.konanTargets + watchosTarget.konanTargets + macosTarget.konanTargets)
+
+        CliCommonizer(this::class.java.classLoader).commonizeNativeDistribution(
+            konanHome = konanHome,
+            outputTargets = setOf(iosTarget, watchosTarget, macosTarget, appleTarget),
+            outputDirectory = temporaryOutputDirectory.root,
+            logLevel = CommonizerLogLevel.Info
+        )
+
+        assertTrue(
+            resolveCommonizedDirectory(temporaryOutputDirectory.root, iosTarget).isDirectory,
+            "Expected directory for $iosTarget"
+        )
+
+        assertTrue(
+            resolveCommonizedDirectory(temporaryOutputDirectory.root, watchosTarget).isDirectory,
+            "Expected directory for $watchosTarget"
+        )
+
+        assertTrue(
+            resolveCommonizedDirectory(temporaryOutputDirectory.root, macosTarget).isDirectory,
+            "Expected directory for $macosTarget"
+        )
+
+        assertTrue(
+            resolveCommonizedDirectory(temporaryOutputDirectory.root, appleTarget).isDirectory,
+            "Expected directory for $appleTarget"
+        )
+    }
+
     @Test
     fun `commonize - no outputTargets specified`() {
         CliCommonizer(this::class.java.classLoader).commonizeNativeDistribution(

native/commonizer/src/org/jetbrains/kotlin/commonizer/core/typeAliasUtils.kt

@@ -17,9 +17,11 @@ internal tailrec fun computeSuitableUnderlyingType(
 ): CirClassOrTypeAliasType? {
     return when (underlyingType) {
         is CirClassType -> underlyingType.withCommonizedArguments(classifiers)
-        is CirTypeAliasType -> if (classifiers.commonDependencies.hasClassifier(underlyingType.classifierId))
-            underlyingType.withCommonizedArguments(classifiers) else
-            computeSuitableUnderlyingType(classifiers, underlyingType.underlyingType)
+        is CirTypeAliasType ->
+            if (classifiers.commonDependencies.hasClassifier(underlyingType.classifierId) ||
+                classifiers.commonizedNodes.typeAliasNode(underlyingType.classifierId)?.commonDeclaration?.invoke() != null
+            ) underlyingType.withCommonizedArguments(classifiers)
+            else computeSuitableUnderlyingType(classifiers, underlyingType.underlyingType)
     }
 }
 

native/commonizer/testData/classifierCommonization/typeAliases/commonized/common/package_root.kt

@@ -1,26 +1,26 @@
 expect class A()
 // Lifted up type aliases:
 typealias B = A // class at the RHS
-typealias C = A // TA at the RHS, expanded to the same class
-typealias C2 = A // 2x TA at the RHS, expanded to the same class
-typealias C3 = A // 3x TA at the RHS, expanded to the same class
+typealias C = B // TA lifted up as is
+typealias C2 = C // TA lifted up as is
+typealias C3 = C2 // TA lifted up as is
 
 typealias D = A // class/TA expanded to the same class at the RHS
-typealias E = A // different TAs expanded to the same class at the RHS
+typealias E = B // different TAs use common type from TA-chain
 
 typealias F = List<String> // parameterized type at the RHS
 typealias H<T> = List<T> // TA with own parameters
 
 typealias I2<T> = List<T>
-typealias I3<R> = List<R>
-typealias I4 = List<String>
+typealias I3<R> = I2<R>
+typealias I4 = I2<String>
 
 typealias I5<V, K> = Map<K, V>
-typealias I6<T, R> = Map<R, T>
+typealias I6<T, R> = I5<T, R>
 
 typealias I7<K, V> = Map<K, V>
-typealias I8<T, R> = Map<R, T>
-typealias I9<Q, W> = Map<W, Q>
+typealias I8<T, R> = I7<R, T>
+typealias I9<Q, W> = I8<Q, W>
 
 typealias J<T> = Function<T> // function type at the RHS
 typealias M = () -> Unit // same return type
@@ -38,14 +38,14 @@ expect class T
 typealias U = A // same nullability of the RHS class
 
 expect class V // different nullability of the RHS class
-typealias W = A // same nullability of the RHS TA
+typealias W = U // same nullability of the RHS TA
 expect class X // different nullability of the RHS TA
 expect class Y // TA at the RHS with the different nullability of own RHS
 
 // Supertypes:
 expect class FILE expect constructor(): kotlinx.cinterop.CStructVar
 
-typealias uuid_t = kotlinx.cinterop.CArrayPointer<kotlinx.cinterop.UByteVar>
+typealias uuid_t = __darwin_uuid_t
 typealias __darwin_uuid_t = kotlinx.cinterop.CArrayPointer<kotlinx.cinterop.UByteVar>
 
 expect val uuid: uuid_t

native/commonizer/testData/classifierCommonization/typeAliases/original/linux/package_root.kt

@@ -2,12 +2,12 @@ class A
 
 // Lifted up type aliases:
 typealias B = A // class at the RHS
-typealias C = B // TA at the RHS, expanded to the same class
-typealias C2 = C // 2x TA at the RHS, expanded to the same class
-typealias C3 = C2 // 3x TA at the RHS, expanded to the same class
+typealias C = B // TA lifted up as is
+typealias C2 = C // TA lifted up as is
+typealias C3 = C2 // TA lifted up as is
 
 typealias D = B // class/TA expanded to the same class at the RHS
-typealias E = C // different TAs expanded to the same class at the RHS
+typealias E = C // different TAs use common type from TA-chain
 
 typealias F = List<String> // parameterized type at the RHS
 typealias G = List<Int> // different parameterized types at the RHS

native/commonizer/testData/classifierCommonization/typeAliases/original/macos/package_root.kt

@@ -2,12 +2,12 @@ class A
 
 // Lifted up type aliases:
 typealias B = A // class at the RHS
-typealias C = B // TA at the RHS, expanded to the same class
-typealias C2 = C // 2x TA at the RHS, expanded to the same class
-typealias C3 = C2 // 3x TA at the RHS, expanded to the same class
+typealias C = B // TA lifted up as is
+typealias C2 = C // TA lifted up as is
+typealias C3 = C2 // TA lifted up as is
 
 typealias D = A // class/TA expanded to the same class at the RHS
-typealias E = B // different TAs expanded to the same class at the RHS
+typealias E = B // different TAs use common type from TA-chain
 
 typealias F = List<String> // parameterized type at the RHS
 typealias G = List<String> // different parameterized types at the RHS

native/commonizer/tests/org/jetbrains/kotlin/commonizer/hierarchical/HierarchicalClassAndTypeAliasCommonizationTest.kt

@@ -548,6 +548,69 @@ class HierarchicalClassAndTypeAliasCommonizationTest : AbstractInlineSourcesComm
         )
     }
 
+    @Test
+    fun `test typealias to numbers`() {
+        val result = commonize {
+            outputTarget("(a, b)", "(c, d)", "(a, b, c, d)")
+
+            simpleSingleSourceTarget(
+                "a", """
+                    typealias Proxy = Long
+                    typealias X = Proxy
+                    val x: X
+                """.trimIndent()
+            )
+
+            simpleSingleSourceTarget(
+                "b", """
+                    typealias Proxy = Long
+                    typealias X = Proxy
+                    val x: X
+                """.trimIndent()
+            )
+
+            simpleSingleSourceTarget(
+                "c", """
+                    typealias Proxy = Int
+                    typealias X = Proxy
+                    val x: X
+                """.trimIndent()
+            )
+
+            simpleSingleSourceTarget(
+                "d", """
+                    typealias Proxy = Short
+                    typealias X = Proxy
+                    val x: X
+                """.trimIndent()
+            )
+        }
+
+        result.assertCommonized(
+            "(a, b)", """
+                typealias Proxy = Long
+                typealias X = Proxy
+                expect val x: X
+            """.trimIndent()
+        )
+
+        result.assertCommonized(
+            "(c, d)", """
+                expect class Proxy
+                typealias X = Proxy
+                expect val x: X
+            """.trimIndent()
+        )
+
+        result.assertCommonized(
+            "(a, b, c, d)", """
+                expect class Proxy
+                typealias X = Proxy
+                expect val x: X
+            """.trimIndent()
+        )
+    }
+
     fun `todo - test boxed function using TA and expanded type`() {
         val result = commonize {
             outputTarget("(a, b)")