diff --git a/js/js.libraries/src/builtins/Enum.kt b/js/js.libraries/src/builtins/Enum.kt
index 2c784361f70..8577a7eb5ec 100644
--- a/js/js.libraries/src/builtins/Enum.kt
+++ b/js/js.libraries/src/builtins/Enum.kt
@@ -16,7 +16,7 @@
 
 package kotlin
 
-class Enum<T : Enum<T>> : Comparable<Enum<T>> {
+public class Enum<T : Enum<T>> : Comparable<Enum<T>> {
     @JsName("name$") private var _name: String = ""
     @JsName("ordinal$") private var _ordinal: Int = 0
 
diff --git a/js/js.libraries/src/builtins/hacks.kt b/js/js.libraries/src/builtins/hacks.kt
index 109a3f391e0..97d3266a162 100644
--- a/js/js.libraries/src/builtins/hacks.kt
+++ b/js/js.libraries/src/builtins/hacks.kt
@@ -20,8 +20,8 @@ import kotlin.annotation.AnnotationTarget.*
 
 @Retention(AnnotationRetention.BINARY)
 @Target(CLASS, FUNCTION, PROPERTY, CONSTRUCTOR, PROPERTY_GETTER, PROPERTY_SETTER)
-@native annotation class JsName(val name: String)
+@native internal annotation class JsName(val name: String)
 
-@native annotation class native
+@native internal annotation class native
 
-@native fun js(code: String): dynamic
\ No newline at end of file
+@native internal fun js(code: String): dynamic
\ No newline at end of file
diff --git a/js/js.libraries/src/core/exceptions.kt b/js/js.libraries/src/core/exceptions.kt
index 3d01a7d0432..37719880df8 100644
--- a/js/js.libraries/src/core/exceptions.kt
+++ b/js/js.libraries/src/core/exceptions.kt
@@ -16,28 +16,28 @@
 
 package kotlin
 
-open class Error(message: String? = null) : Throwable(message, null)
+public open class Error(message: String? = null) : Throwable(message, null)
 
-open class Exception(message: String? = null) : Throwable(message, null)
+public open class Exception(message: String? = null) : Throwable(message, null)
 
-open class RuntimeException(message: String? = null) : Exception(message)
+public open class RuntimeException(message: String? = null) : Exception(message)
 
-open class IllegalArgumentException(message: String? = null) : RuntimeException(message)
+public open class IllegalArgumentException(message: String? = null) : RuntimeException(message)
 
-open class IllegalStateException(message: String? = null) : RuntimeException(message)
+public open class IllegalStateException(message: String? = null) : RuntimeException(message)
 
-open class IndexOutOfBoundsException(message: String? = null) : RuntimeException(message)
+public open class IndexOutOfBoundsException(message: String? = null) : RuntimeException(message)
 
-open class ConcurrentModificationException(message: String? = null) : RuntimeException(message)
+public open class ConcurrentModificationException(message: String? = null) : RuntimeException(message)
 
-open class UnsupportedOperationException(message: String? = null) : RuntimeException(message)
+public open class UnsupportedOperationException(message: String? = null) : RuntimeException(message)
 
-open class NumberFormatException(message: String? = null) : RuntimeException(message)
+public open class NumberFormatException(message: String? = null) : RuntimeException(message)
 
-open class NullPointerException(message: String? = null) : RuntimeException(message)
+public open class NullPointerException(message: String? = null) : RuntimeException(message)
 
-open class ClassCastException(message: String? = null) : RuntimeException(message)
+public open class ClassCastException(message: String? = null) : RuntimeException(message)
 
-open class AssertionError(message: String? = null) : Error(message)
+public open class AssertionError(message: String? = null) : Error(message)
 
-open class NoSuchElementException(message: String? = null) : Exception()
+public open class NoSuchElementException(message: String? = null) : Exception()
diff --git a/js/js.libraries/src/core/text.kt b/js/js.libraries/src/core/text.kt
index 76023676bdf..32776d75542 100644
--- a/js/js.libraries/src/core/text.kt
+++ b/js/js.libraries/src/core/text.kt
@@ -17,13 +17,13 @@
 package kotlin.text
 
 
-interface Appendable {
+public interface Appendable {
     fun append(csq: CharSequence?): Appendable
     fun append(csq: CharSequence?, start: Int, end: Int): Appendable
     fun append(c: Char): Appendable
 }
 
-class StringBuilder(content: String = "") : Appendable, CharSequence {
+public class StringBuilder(content: String = "") : Appendable, CharSequence {
     constructor(capacity: Int) : this() {}
 
     constructor(content: CharSequence) : this(content.toString()) {}