Workaround with expect / actual

Author: SimonMarquis

multi/src/commonMain/kotlin/com/example/Entity.kt

@@ -24,6 +24,8 @@ sealed class Entity private constructor(private val id: String) {
 
     @SealedObjectInstances
     companion object {
-        val all: Set<Entity> by lazy { Entity.sealedObjectInstances() }
+        val all: Set<Entity> by lazy { all() }
     }
 }
+
+internal expect fun Entity.Companion.all(): Set<Entity>

multi/src/jvmMain/kotlin/com/example/Entity.jvm.kt

@@ -0,0 +1,18 @@
+/*
+ * Copyright (C) 2023 Simon Marquis
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.example
+
+internal actual fun Entity.Companion.all(): Set<Entity> = sealedObjectInstances()