[stdlib] Merge js-ir specific sources into common js sources

libraries/stdlib/js/builtins/String.kt

@@ -0,0 +1,47 @@
+/*
+ * Copyright 2010-2019 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+@file:Suppress("NON_ABSTRACT_FUNCTION_WITH_NO_BODY", "MUST_BE_INITIALIZED_OR_BE_ABSTRACT", "UNUSED_PARAMETER")
+
+package kotlin
+
+/**
+ * The `String` class represents character strings. All string literals in Kotlin programs, such as `"abc"`, are
+ * implemented as instances of this class.
+ */
+public class String : Comparable<String>, CharSequence {
+    companion object {}
+    
+    /**
+     * Returns a string obtained by concatenating this string with the string representation of the given [other] object.
+     */
+    @kotlin.internal.IntrinsicConstEvaluation
+    public operator fun plus(other: Any?): String
+
+    @kotlin.internal.IntrinsicConstEvaluation
+    public override val length: Int
+
+    /**
+     * Returns the character of this string at the specified [index].
+     *
+     * If the [index] is out of bounds of this string, throws an [IndexOutOfBoundsException] except in Kotlin/JS
+     * where the behavior is unspecified.
+     */
+    @kotlin.internal.IntrinsicConstEvaluation
+    public override fun get(index: Int): Char
+
+    public override fun subSequence(startIndex: Int, endIndex: Int): CharSequence
+
+    @kotlin.internal.IntrinsicConstEvaluation
+    public override fun compareTo(other: String): Int
+
+    @kotlin.internal.IntrinsicConstEvaluation
+    public override fun equals(other: Any?): Boolean
+
+    public override fun hashCode(): Int
+
+    @kotlin.internal.IntrinsicConstEvaluation
+    public override fun toString(): String
+}