diff --git a/js/js.libraries/src/core/javautil.kt b/js/js.libraries/src/core/javautil.kt
index 59a003224ae..31adf1747dd 100644
--- a/js/js.libraries/src/core/javautil.kt
+++ b/js/js.libraries/src/core/javautil.kt
@@ -7,17 +7,17 @@ native
 public fun <K, V> MutableMap<K, V>.set(key: K, value: V): Unit = noImpl
 
 library("collectionsMax")
-public fun max<T>(col : Collection<T>, comp : Comparator<T>) : T = js.noImpl
+public fun max<T>(col: Collection<T>, comp: Comparator<T>): T = js.noImpl
 
 library
 public trait Comparator<T> {
-    fun compare(obj1 : T, obj2 : T) : Int;
+    fun compare(obj1: T, obj2: T): Int;
 }
 
 library
 public abstract class AbstractCollection<E>() : MutableCollection<E> {
     override fun toArray(): Array<Any?> = js.noImpl
-    override fun <T> toArray(a : Array<out T>) : Array<T> = js.noImpl
+    override fun <T> toArray(a: Array<out T>): Array<T> = js.noImpl
 
     override fun isEmpty(): Boolean = js.noImpl
     override fun contains(o: Any?): Boolean = js.noImpl
@@ -27,44 +27,61 @@ public abstract class AbstractCollection<E>() : MutableCollection<E> {
     override fun remove(o: Any?): Boolean = js.noImpl
 
     override fun addAll(c: Collection<E>): Boolean = js.noImpl
-    override fun containsAll(c : Collection<Any?>) : Boolean = js.noImpl
-    override fun removeAll(c : Collection<Any?>) : Boolean = js.noImpl
-    override fun retainAll(c : Collection<Any?>) : Boolean = js.noImpl
+    override fun containsAll(c: Collection<Any?>): Boolean = js.noImpl
+    override fun removeAll(c: Collection<Any?>): Boolean = js.noImpl
+    override fun retainAll(c: Collection<Any?>): Boolean = js.noImpl
 
     override fun clear(): Unit = js.noImpl
     override fun size(): Int = js.noImpl
 
-    override fun hashCode() : Int = js.noImpl
-    override fun equals(other : Any?) : Boolean = js.noImpl
+    override fun hashCode(): Int = js.noImpl
+    override fun equals(other: Any?): Boolean = js.noImpl
 }
 
 library
-public abstract class AbstractList<E>(): AbstractCollection<E>(), MutableList<E> {
+public abstract class AbstractList<E>() : AbstractCollection<E>(), MutableList<E> {
     override fun get(index: Int): E = js.noImpl
     override fun set(index: Int, element: E): E = js.noImpl
 
+    override fun add(e: E): Boolean = js.noImpl
     library("addAt")
     override fun add(index: Int, element: E): Unit = js.noImpl
-    override fun addAll(index : Int, c : Collection<E>) : Boolean = js.noImpl
+    override fun addAll(index: Int, c: Collection<E>): Boolean = js.noImpl
 
     library("removeAt")
     override fun remove(index: Int): E = js.noImpl
 
     override fun indexOf(o: Any?): Int = js.noImpl
-    override fun lastIndexOf(o : Any?) : Int = js.noImpl
+    override fun lastIndexOf(o: Any?): Int = js.noImpl
 
-    override fun listIterator() : MutableListIterator<E> = js.noImpl
-    override fun listIterator(index : Int) : MutableListIterator<E> = js.noImpl
+    override fun listIterator(): MutableListIterator<E> = js.noImpl
+    override fun listIterator(index: Int): MutableListIterator<E> = js.noImpl
 
-    override fun subList(fromIndex : Int, toIndex : Int) : MutableList<E> = js.noImpl
+    override fun subList(fromIndex: Int, toIndex: Int): MutableList<E> = js.noImpl
+
+    override fun size(): Int = js.noImpl
+
+    override fun equals(other: Any?): Boolean = js.noImpl
+
+    fun toString(): String = js.noImpl
 }
 
 library
-public open class ArrayList<E>(capacity:Int=0) : AbstractList<E>() {
+public open class ArrayList<E>(capacity: Int = 0) : AbstractList<E>() {
 }
 
 library
-public open class HashSet<E>(): AbstractCollection<E>(), MutableSet<E> {
+public open class LinkedList<E>() : AbstractList<E>() {
+    public override fun get(index: Int): E = js.noImpl
+    public override fun set(index: Int, element: E): E = js.noImpl
+    public override fun add(index: Int, element: E): Unit = js.noImpl
+    public fun poll(): E? = js.noImpl
+    public fun peek(): E? = js.noImpl
+    public fun offer(e: E): Boolean = js.noImpl
+}
+
+library
+public open class HashSet<E>() : AbstractCollection<E>(), MutableSet<E> {
 }
 
 library
@@ -76,33 +93,23 @@ public open class TreeSet<E>() : AbstractCollection<E>(), MutableSet<E>, SortedS
 }
 
 library
-public open class LinkedHashSet<E>(): AbstractCollection<E>(), MutableSet<E> {
+public open class LinkedHashSet<E>() : AbstractCollection<E>(), MutableSet<E> {
 }
 
 library
-public open class HashMap<K, V>(capacity:Int=0) : MutableMap<K, V> {
-    public override fun size() : Int = js.noImpl
-    public override fun isEmpty() : Boolean = js.noImpl
-    public override fun get(key : Any?) : V? = js.noImpl
-    public override fun containsKey(key : Any?) : Boolean = js.noImpl
-    public override fun put(key : K, value : V) : V = js.noImpl
-    public override fun putAll(m : Map<out K, out V>) : Unit = js.noImpl
-    public override fun remove(key : Any?) : V? = js.noImpl
-    public override fun clear() : Unit = js.noImpl
-    public override fun containsValue(value : Any?) : Boolean = js.noImpl
-    public override fun keySet() : MutableSet<K> = js.noImpl
-    public override fun values() : MutableCollection<V> = js.noImpl
-    public override fun entrySet() : MutableSet<MutableMap.MutableEntry<K, V>> = js.noImpl
-}
-
-library
-public open class LinkedList<E>(): AbstractList<E>() {
-    public override fun get(index: Int): E = js.noImpl
-    public override fun set(index: Int, element: E): E = js.noImpl
-    public override fun add(index: Int, element: E): Unit = js.noImpl
-    public fun poll(): E? = js.noImpl
-    public fun peek(): E? = js.noImpl
-    public fun offer(e: E): Boolean = js.noImpl
+public open class HashMap<K, V>(capacity: Int = 0) : MutableMap<K, V> {
+    public override fun size(): Int = js.noImpl
+    public override fun isEmpty(): Boolean = js.noImpl
+    public override fun get(key: Any?): V? = js.noImpl
+    public override fun containsKey(key: Any?): Boolean = js.noImpl
+    public override fun put(key: K, value: V): V = js.noImpl
+    public override fun putAll(m: Map<out K, out V>): Unit = js.noImpl
+    public override fun remove(key: Any?): V? = js.noImpl
+    public override fun clear(): Unit = js.noImpl
+    public override fun containsValue(value: Any?): Boolean = js.noImpl
+    public override fun keySet(): MutableSet<K> = js.noImpl
+    public override fun values(): MutableCollection<V> = js.noImpl
+    public override fun entrySet(): MutableSet<MutableMap.MutableEntry<K, V>> = js.noImpl
 }
 
 library
@@ -110,20 +117,21 @@ public class StringBuilder() : Appendable {
     override fun append(c: Char): Appendable? = js.noImpl
     override fun append(csq: CharSequence?): Appendable? = js.noImpl
     override fun append(csq: CharSequence?, start: Int, end: Int): Appendable? = js.noImpl
-    public fun append(obj : Any?) : StringBuilder = js.noImpl
-    public fun toString() : String = js.noImpl
+    public fun append(obj: Any?): StringBuilder = js.noImpl
+    public fun toString(): String = js.noImpl
 }
 
 library
-public class NoSuchElementException() : Exception() {}
+public class NoSuchElementException() : Exception() {
+}
 
 library
 public trait Enumeration<E> {
-    open public fun hasMoreElements() : Boolean
-    open public fun nextElement() : E
+    public fun hasMoreElements(): Boolean
+    public fun nextElement(): E
 }
 
 native
 public class Date() {
-    public fun getTime() : Int = js.noImpl
+    public fun getTime(): Int = js.noImpl
 }