Require explicit extern members in extern class/object and update docs

lynglib/src/commonTest/kotlin/BindingTest.kt

@@ -164,7 +164,7 @@ class BindingTest {
         val ms = Script.newScope()
         ms.eval("""
             extern class A {
-                fun get1(): String
+                extern fun get1(): String
             }
             
             extern fun getA(): A
@@ -184,4 +184,3 @@ class BindingTest {
     }
 }
 
-

lynglib/src/commonTest/kotlin/BridgeBindingTest.kt

@@ -231,7 +231,7 @@ class BridgeBindingTest {
         val ms = Script.newScope()
         ms.eval("""
             extern class A {
-                val field: Int
+                extern val field: Int
             }
             
             fun test(a: A) = a.field

lynglib/src/commonTest/kotlin/MiniAstTest.kt

@@ -249,13 +249,13 @@ class MiniAstTest {
             // Doc2
             extern class C1 {
                 // Doc3
-                fun m1()
+                extern fun m1()
             }
             
             // Doc4
             extern object O1 {
                 // Doc5
-                val v1: String
+                extern val v1: String
             }
             
             // Doc6

lynglib/src/commonTest/kotlin/ScriptTest.kt

@@ -3080,11 +3080,11 @@ class ScriptTest {
             """
             extern fun hostFunction(a: Int, b: String): String
             extern class HostClass(name: String) {
-                fun doSomething(): Int
-                val status: String
+                extern fun doSomething(): Int
+                extern val status: String
             }
             extern object HostObject {
-                fun getInstance(): HostClass
+                extern fun getInstance(): HostClass
             }
             extern enum HostEnum {
                 VALUE1, VALUE2
@@ -3097,6 +3097,19 @@ class ScriptTest {
         )
     }
 
+    @Test
+    fun testExternClassMembersMustBeExplicitlyExtern() = runTest {
+        assertFailsWith<ScriptError> {
+            eval(
+                """
+                extern class HostClass {
+                    fun doSomething(): Int
+                }
+                """.trimIndent()
+            )
+        }
+    }
+
     @Test
     fun testExternExtension() = runTest {
         eval(