diff --git a/libraries/stdlib/js/src/kotlin/text/StringBuilderJs.kt b/libraries/stdlib/js/src/kotlin/text/StringBuilderJs.kt
index b7c16eb91ad..806549d23da 100644
--- a/libraries/stdlib/js/src/kotlin/text/StringBuilderJs.kt
+++ b/libraries/stdlib/js/src/kotlin/text/StringBuilderJs.kt
@@ -10,20 +10,20 @@ package kotlin.text
  *
  * String builder can be used to efficiently perform multiple string manipulation operations.
  */
-public actual class StringBuilder actual constructor(content: String) : Appendable, CharSequence {
+public actual class StringBuilder public actual constructor(content: String) : Appendable, CharSequence {
     /**
      * Constructs an empty string builder with the specified initial [capacity].
      *
      * In Kotlin/JS implementation of StringBuilder the initial capacity has no effect on the further performance of operations.
      */
-    actual constructor(capacity: Int) : this() {
+    public actual constructor(capacity: Int) : this() {
     }
 
     /** Constructs a string builder that contains the same characters as the specified [content] char sequence. */
-    actual constructor(content: CharSequence) : this(content.toString()) {}
+    public actual constructor(content: CharSequence) : this(content.toString()) {}
 
     /** Constructs an empty string builder. */
-    actual constructor() : this("")
+    public actual constructor() : this("")
 
     private var string: String = if (content !== undefined) content else ""
 
@@ -57,7 +57,7 @@ public actual class StringBuilder actual constructor(content: String) : Appendab
      * Note that the reverse operation may produce new surrogate pairs that were unpaired low-surrogates and high-surrogates before the operation.
      * For example, reversing `"\uDC00\uD800"` produces `"\uD800\uDC00"` which is a valid surrogate pair.
      */
-    actual fun reverse(): StringBuilder {
+    public actual fun reverse(): StringBuilder {
         var reversed = ""
         var index = string.length - 1
         while (index >= 0) {
@@ -83,7 +83,7 @@ public actual class StringBuilder actual constructor(content: String) : Appendab
      * The overall effect is exactly as if the [value] were converted to a string by the `value.toString()` method,
      * and then that string was appended to this string builder.
      */
-    actual fun append(value: Any?): StringBuilder {
+    public actual fun append(value: Any?): StringBuilder {
         string += value.toString()
         return this
     }
@@ -95,7 +95,7 @@ public actual class StringBuilder actual constructor(content: String) : Appendab
      * and then that string was appended to this string builder.
      */
     @SinceKotlin("1.3")
-    actual fun append(value: Boolean): StringBuilder {
+    public actual fun append(value: Boolean): StringBuilder {
         string += value
         return this
     }
@@ -107,7 +107,7 @@ public actual class StringBuilder actual constructor(content: String) : Appendab
      * and then that string was appended to this string builder.
      */
     @SinceKotlin("1.9")
-    actual fun append(value: Byte): StringBuilder = append(value.toString())
+    public actual fun append(value: Byte): StringBuilder = append(value.toString())
 
     /**
      * Appends the string representation of the specified short [value] to this string builder and returns this instance.
@@ -116,7 +116,7 @@ public actual class StringBuilder actual constructor(content: String) : Appendab
      * and then that string was appended to this string builder.
      */
     @SinceKotlin("1.9")
-    actual fun append(value: Short): StringBuilder = append(value.toString())
+    public actual fun append(value: Short): StringBuilder = append(value.toString())
 
     /**
      * Appends the string representation of the specified int [value] to this string builder and returns this instance.
@@ -125,7 +125,7 @@ public actual class StringBuilder actual constructor(content: String) : Appendab
      * and then that string was appended to this string builder.
      */
     @SinceKotlin("1.9")
-    actual fun append(value: Int): StringBuilder = append(value.toString())
+    public actual fun append(value: Int): StringBuilder = append(value.toString())
 
     /**
      * Appends the string representation of the specified long [value] to this string builder and returns this instance.
@@ -134,7 +134,7 @@ public actual class StringBuilder actual constructor(content: String) : Appendab
      * and then that string was appended to this string builder.
      */
     @SinceKotlin("1.9")
-    actual fun append(value: Long): StringBuilder = append(value.toString())
+    public actual fun append(value: Long): StringBuilder = append(value.toString())
 
     /**
      * Appends the string representation of the specified float [value] to this string builder and returns this instance.
@@ -143,7 +143,7 @@ public actual class StringBuilder actual constructor(content: String) : Appendab
      * and then that string was appended to this string builder.
      */
     @SinceKotlin("1.9")
-    actual fun append(value: Float): StringBuilder = append(value.toString())
+    public actual fun append(value: Float): StringBuilder = append(value.toString())
 
     /**
      * Appends the string representation of the specified double [value] to this string builder and returns this instance.
@@ -152,7 +152,7 @@ public actual class StringBuilder actual constructor(content: String) : Appendab
      * and then that string was appended to this string builder.
      */
     @SinceKotlin("1.9")
-    actual fun append(value: Double): StringBuilder = append(value.toString())
+    public actual fun append(value: Double): StringBuilder = append(value.toString())
 
     /**
      * Appends characters in the specified character array [value] to this string builder and returns this instance.
@@ -160,7 +160,7 @@ public actual class StringBuilder actual constructor(content: String) : Appendab
      * Characters are appended in order, starting at the index 0.
      */
     @SinceKotlin("1.4")
-    actual fun append(value: CharArray): StringBuilder {
+    public actual fun append(value: CharArray): StringBuilder {
         string += value.concatToString()
         return this
     }
@@ -171,7 +171,7 @@ public actual class StringBuilder actual constructor(content: String) : Appendab
      * If [value] is `null`, then the four characters `"null"` are appended.
      */
     @SinceKotlin("1.3")
-    actual fun append(value: String?): StringBuilder {
+    public actual fun append(value: String?): StringBuilder {
         this.string += value ?: "null"
         return this
     }
@@ -186,7 +186,7 @@ public actual class StringBuilder actual constructor(content: String) : Appendab
     @SinceKotlin("1.3")
 //    @ExperimentalStdlibApi
     @Deprecated("Obtaining StringBuilder capacity is not supported in JS and common code.", level = DeprecationLevel.WARNING)
-    actual fun capacity(): Int = length
+    public actual fun capacity(): Int = length
 
     /**
      * Ensures that the capacity of this string builder is at least equal to the specified [minimumCapacity].
@@ -198,7 +198,7 @@ public actual class StringBuilder actual constructor(content: String) : Appendab
      * thus calling this method has no effect on the further performance of operations.
      */
     @SinceKotlin("1.4")
-    actual fun ensureCapacity(minimumCapacity: Int) {
+    public actual fun ensureCapacity(minimumCapacity: Int) {
     }
 
     /**
@@ -207,7 +207,7 @@ public actual class StringBuilder actual constructor(content: String) : Appendab
      * Returns `-1` if the specified [string] does not occur in this string builder.
      */
     @SinceKotlin("1.4")
-    actual fun indexOf(string: String): Int = this.string.asDynamic().indexOf(string)
+    public actual fun indexOf(string: String): Int = this.string.asDynamic().indexOf(string)
 
     /**
      * Returns the index within this string builder of the first occurrence of the specified [string],
@@ -216,7 +216,7 @@ public actual class StringBuilder actual constructor(content: String) : Appendab
      * Returns `-1` if the specified [string] does not occur in this string builder starting at the specified [startIndex].
      */
     @SinceKotlin("1.4")
-    actual fun indexOf(string: String, startIndex: Int): Int = this.string.asDynamic().indexOf(string, startIndex)
+    public actual fun indexOf(string: String, startIndex: Int): Int = this.string.asDynamic().indexOf(string, startIndex)
 
     /**
      * Returns the index within this string builder of the last occurrence of the specified [string].
@@ -225,7 +225,7 @@ public actual class StringBuilder actual constructor(content: String) : Appendab
      * Returns `-1` if the specified [string] does not occur in this string builder.
      */
     @SinceKotlin("1.4")
-    actual fun lastIndexOf(string: String): Int = this.string.asDynamic().lastIndexOf(string)
+    public actual fun lastIndexOf(string: String): Int = this.string.asDynamic().lastIndexOf(string)
 
     /**
      * Returns the index within this string builder of the last occurrence of the specified [string],
@@ -234,7 +234,7 @@ public actual class StringBuilder actual constructor(content: String) : Appendab
      * Returns `-1` if the specified [string] does not occur in this string builder starting at the specified [startIndex].
      */
     @SinceKotlin("1.4")
-    actual fun lastIndexOf(string: String, startIndex: Int): Int {
+    public actual fun lastIndexOf(string: String, startIndex: Int): Int {
         if (string.isEmpty() && startIndex < 0) return -1
         return this.string.asDynamic().lastIndexOf(string, startIndex)
     }
@@ -248,7 +248,7 @@ public actual class StringBuilder actual constructor(content: String) : Appendab
      * @throws IndexOutOfBoundsException if [index] is less than zero or greater than the length of this string builder.
      */
     @SinceKotlin("1.4")
-    actual fun insert(index: Int, value: Boolean): StringBuilder {
+    public actual fun insert(index: Int, value: Boolean): StringBuilder {
         AbstractList.checkPositionIndex(index, length)
 
         string = string.substring(0, index) + value + string.substring(index)
@@ -264,7 +264,7 @@ public actual class StringBuilder actual constructor(content: String) : Appendab
      * @throws IndexOutOfBoundsException if [index] is less than zero or greater than the length of this string builder.
      */
     @SinceKotlin("1.9")
-    actual fun insert(index: Int, value: Byte): StringBuilder = insert(index, value.toString())
+    public actual fun insert(index: Int, value: Byte): StringBuilder = insert(index, value.toString())
 
     /**
      * Inserts the string representation of the specified short [value] into this string builder at the specified [index] and returns this instance.
@@ -275,7 +275,7 @@ public actual class StringBuilder actual constructor(content: String) : Appendab
      * @throws IndexOutOfBoundsException if [index] is less than zero or greater than the length of this string builder.
      */
     @SinceKotlin("1.9")
-    actual fun insert(index: Int, value: Short): StringBuilder = insert(index, value.toString())
+    public actual fun insert(index: Int, value: Short): StringBuilder = insert(index, value.toString())
 
     /**
      * Inserts the string representation of the specified int [value] into this string builder at the specified [index] and returns this instance.
@@ -286,7 +286,7 @@ public actual class StringBuilder actual constructor(content: String) : Appendab
      * @throws IndexOutOfBoundsException if [index] is less than zero or greater than the length of this string builder.
      */
     @SinceKotlin("1.9")
-    actual fun insert(index: Int, value: Int): StringBuilder = insert(index, value.toString())
+    public actual fun insert(index: Int, value: Int): StringBuilder = insert(index, value.toString())
 
     /**
      * Inserts the string representation of the specified long [value] into this string builder at the specified [index] and returns this instance.
@@ -297,7 +297,7 @@ public actual class StringBuilder actual constructor(content: String) : Appendab
      * @throws IndexOutOfBoundsException if [index] is less than zero or greater than the length of this string builder.
      */
     @SinceKotlin("1.9")
-    actual fun insert(index: Int, value: Long): StringBuilder = insert(index, value.toString())
+    public actual fun insert(index: Int, value: Long): StringBuilder = insert(index, value.toString())
 
     /**
      * Inserts the string representation of the specified float [value] into this string builder at the specified [index] and returns this instance.
@@ -308,7 +308,7 @@ public actual class StringBuilder actual constructor(content: String) : Appendab
      * @throws IndexOutOfBoundsException if [index] is less than zero or greater than the length of this string builder.
      */
     @SinceKotlin("1.9")
-    actual fun insert(index: Int, value: Float): StringBuilder = insert(index, value.toString())
+    public actual fun insert(index: Int, value: Float): StringBuilder = insert(index, value.toString())
 
     /**
      * Inserts the string representation of the specified double [value] into this string builder at the specified [index] and returns this instance.
@@ -319,7 +319,7 @@ public actual class StringBuilder actual constructor(content: String) : Appendab
      * @throws IndexOutOfBoundsException if [index] is less than zero or greater than the length of this string builder.
      */
     @SinceKotlin("1.9")
-    actual fun insert(index: Int, value: Double): StringBuilder = insert(index, value.toString())
+    public actual fun insert(index: Int, value: Double): StringBuilder = insert(index, value.toString())
 
     /**
      * Inserts the specified character [value] into this string builder at the specified [index] and returns this instance.
@@ -327,7 +327,7 @@ public actual class StringBuilder actual constructor(content: String) : Appendab
      * @throws IndexOutOfBoundsException if [index] is less than zero or greater than the length of this string builder.
      */
     @SinceKotlin("1.4")
-    actual fun insert(index: Int, value: Char): StringBuilder {
+    public actual fun insert(index: Int, value: Char): StringBuilder {
         AbstractList.checkPositionIndex(index, length)
 
         string = string.substring(0, index) + value + string.substring(index)
@@ -342,7 +342,7 @@ public actual class StringBuilder actual constructor(content: String) : Appendab
      * @throws IndexOutOfBoundsException if [index] is less than zero or greater than the length of this string builder.
      */
     @SinceKotlin("1.4")
-    actual fun insert(index: Int, value: CharArray): StringBuilder {
+    public actual fun insert(index: Int, value: CharArray): StringBuilder {
         AbstractList.checkPositionIndex(index, length)
 
         string = string.substring(0, index) + value.concatToString() + string.substring(index)
@@ -360,7 +360,7 @@ public actual class StringBuilder actual constructor(content: String) : Appendab
      * @throws IndexOutOfBoundsException if [index] is less than zero or greater than the length of this string builder.
      */
     @SinceKotlin("1.4")
-    actual fun insert(index: Int, value: CharSequence?): StringBuilder {
+    public actual fun insert(index: Int, value: CharSequence?): StringBuilder {
         AbstractList.checkPositionIndex(index, length)
 
         string = string.substring(0, index) + value.toString() + string.substring(index)
@@ -376,7 +376,7 @@ public actual class StringBuilder actual constructor(content: String) : Appendab
      * @throws IndexOutOfBoundsException if [index] is less than zero or greater than the length of this string builder.
      */
     @SinceKotlin("1.4")
-    actual fun insert(index: Int, value: Any?): StringBuilder {
+    public actual fun insert(index: Int, value: Any?): StringBuilder {
         AbstractList.checkPositionIndex(index, length)
 
         string = string.substring(0, index) + value.toString() + string.substring(index)
@@ -391,7 +391,7 @@ public actual class StringBuilder actual constructor(content: String) : Appendab
      * @throws IndexOutOfBoundsException if [index] is less than zero or greater than the length of this string builder.
      */
     @SinceKotlin("1.4")
-    actual fun insert(index: Int, value: String?): StringBuilder {
+    public actual fun insert(index: Int, value: String?): StringBuilder {
         AbstractList.checkPositionIndex(index, length)
 
         val toInsert = value ?: "null"
@@ -411,7 +411,7 @@ public actual class StringBuilder actual constructor(content: String) : Appendab
      *  @throws IndexOutOfBoundsException or [IllegalArgumentException] if [newLength] is less than zero.
      */
     @SinceKotlin("1.4")
-    actual fun setLength(newLength: Int) {
+    public actual fun setLength(newLength: Int) {
         if (newLength < 0) {
             throw IllegalArgumentException("Negative new length: $newLength.")
         }
@@ -431,7 +431,7 @@ public actual class StringBuilder actual constructor(content: String) : Appendab
      * @throws IndexOutOfBoundsException if [startIndex] is less than zero or greater than the length of this string builder.
      */
     @SinceKotlin("1.4")
-    actual fun substring(startIndex: Int): String {
+    public actual fun substring(startIndex: Int): String {
         AbstractList.checkPositionIndex(startIndex, length)
 
         return string.substring(startIndex)
@@ -443,7 +443,7 @@ public actual class StringBuilder actual constructor(content: String) : Appendab
      * @throws IndexOutOfBoundsException or [IllegalArgumentException] when [startIndex] or [endIndex] is out of range of this string builder indices or when `startIndex > endIndex`.
      */
     @SinceKotlin("1.4")
-    actual fun substring(startIndex: Int, endIndex: Int): String {
+    public actual fun substring(startIndex: Int, endIndex: Int): String {
         AbstractList.checkBoundsIndexes(startIndex, endIndex, length)
 
         return string.substring(startIndex, endIndex)
@@ -459,7 +459,7 @@ public actual class StringBuilder actual constructor(content: String) : Appendab
      * In Kotlin/JS implementation of StringBuilder the size of the backing storage is always equal to the length of the string builder.
      */
     @SinceKotlin("1.4")
-    actual fun trimToSize() {
+    public actual fun trimToSize() {
     }
 
     override fun toString(): String = string
@@ -667,7 +667,7 @@ public actual inline fun StringBuilder.clear(): StringBuilder = this.clear()
  */
 @SinceKotlin("1.4")
 @Suppress("EXTENSION_SHADOWED_BY_MEMBER", "NOTHING_TO_INLINE")
-public actual inline operator fun StringBuilder.set(index: Int, value: Char) = this.set(index, value)
+public actual inline operator fun StringBuilder.set(index: Int, value: Char): Unit = this.set(index, value)
 
 /**
  * Replaces characters in the specified range of this string builder with characters in the specified string [value] and returns this instance.
@@ -722,7 +722,7 @@ public actual inline fun StringBuilder.deleteRange(startIndex: Int, endIndex: In
  */
 @SinceKotlin("1.4")
 @Suppress("EXTENSION_SHADOWED_BY_MEMBER", "NOTHING_TO_INLINE", "ACTUAL_FUNCTION_WITH_DEFAULT_ARGUMENTS")
-public actual inline fun StringBuilder.toCharArray(destination: CharArray, destinationOffset: Int = 0, startIndex: Int = 0, endIndex: Int = this.length) =
+public actual inline fun StringBuilder.toCharArray(destination: CharArray, destinationOffset: Int = 0, startIndex: Int = 0, endIndex: Int = this.length): Unit =
     this.toCharArray(destination, destinationOffset, startIndex, endIndex)
 
 /**
diff --git a/libraries/stdlib/native-wasm/src/kotlin/text/StringBuilder.kt b/libraries/stdlib/native-wasm/src/kotlin/text/StringBuilder.kt
index 27a4b7fd072..57a43989326 100644
--- a/libraries/stdlib/native-wasm/src/kotlin/text/StringBuilder.kt
+++ b/libraries/stdlib/native-wasm/src/kotlin/text/StringBuilder.kt
@@ -10,22 +10,22 @@ package kotlin.text
  *
  * String builder can be used to efficiently perform multiple string manipulation operations.
  */
-actual class StringBuilder private constructor (
-        private var array: CharArray) : CharSequence, Appendable {
+public actual class StringBuilder
+private constructor (private var array: CharArray) : CharSequence, Appendable {
 
     /** Constructs an empty string builder. */
-    actual constructor() : this(10)
+    public actual constructor() : this(10)
 
     /** Constructs an empty string builder with the specified initial [capacity]. */
-    actual constructor(capacity: Int) : this(CharArray(capacity))
+    public actual constructor(capacity: Int) : this(CharArray(capacity))
 
     /** Constructs a string builder that contains the same characters as the specified [content] string. */
-    actual constructor(content: String) : this(content.toCharArray()) {
+    public actual constructor(content: String) : this(content.toCharArray()) {
         _length = array.size
     }
 
     /** Constructs a string builder that contains the same characters as the specified [content] char sequence. */
-    actual constructor(content: CharSequence): this(content.length) {
+    public actual constructor(content: CharSequence): this(content.length) {
         append(content)
     }
 
@@ -68,7 +68,7 @@ actual class StringBuilder private constructor (
      * For example, reversing `"\uDC00\uD800"` produces `"\uD800\uDC00"` which is a valid surrogate pair.
      */
     // Based on Apache Harmony implementation.
-    actual fun reverse(): StringBuilder {
+    public actual fun reverse(): StringBuilder {
         if (this.length < 2) {
             return this
         }
@@ -140,7 +140,7 @@ actual class StringBuilder private constructor (
      * The overall effect is exactly as if the [value] were converted to a string by the `value.toString()` method,
      * and then that string was appended to this string builder.
      */
-    actual fun append(value: Any?): StringBuilder = append(value.toString())
+    public actual fun append(value: Any?): StringBuilder = append(value.toString())
 
     // TODO: optimize the append overloads with primitive value!
 
@@ -150,7 +150,7 @@ actual class StringBuilder private constructor (
      * The overall effect is exactly as if the [value] were converted to a string by the `value.toString()` method,
      * and then that string was appended to this string builder.
      */
-    actual fun append(value: Boolean): StringBuilder = append(value.toString())
+    public actual fun append(value: Boolean): StringBuilder = append(value.toString())
 
     /**
      * Appends the string representation of the specified byte [value] to this string builder and returns this instance.
@@ -158,7 +158,7 @@ actual class StringBuilder private constructor (
      * The overall effect is exactly as if the [value] were converted to a string by the `value.toString()` method,
      * and then that string was appended to this string builder.
      */
-    actual fun append(value: Byte): StringBuilder = append(value.toString())
+    public actual fun append(value: Byte): StringBuilder = append(value.toString())
 
     /**
      * Appends the string representation of the specified short [value] to this string builder and returns this instance.
@@ -166,7 +166,7 @@ actual class StringBuilder private constructor (
      * The overall effect is exactly as if the [value] were converted to a string by the `value.toString()` method,
      * and then that string was appended to this string builder.
      */
-    actual fun append(value: Short): StringBuilder = append(value.toString())
+    public actual fun append(value: Short): StringBuilder = append(value.toString())
 
     /**
      * Appends the string representation of the specified int [value] to this string builder and returns this instance.
@@ -174,7 +174,7 @@ actual class StringBuilder private constructor (
      * The overall effect is exactly as if the [value] were converted to a string by the `value.toString()` method,
      * and then that string was appended to this string builder.
      */
-    actual fun append(value: Int): StringBuilder {
+    public actual fun append(value: Int): StringBuilder {
         ensureExtraCapacity(11)
         _length += insertInt(array, _length, value)
         return this
@@ -186,7 +186,7 @@ actual class StringBuilder private constructor (
      * The overall effect is exactly as if the [value] were converted to a string by the `value.toString()` method,
      * and then that string was appended to this string builder.
      */
-    actual fun append(value: Long): StringBuilder = append(value.toString())
+    public actual fun append(value: Long): StringBuilder = append(value.toString())
 
     /**
      * Appends the string representation of the specified float [value] to this string builder and returns this instance.
@@ -194,7 +194,7 @@ actual class StringBuilder private constructor (
      * The overall effect is exactly as if the [value] were converted to a string by the `value.toString()` method,
      * and then that string was appended to this string builder.
      */
-    actual fun append(value: Float): StringBuilder = append(value.toString())
+    public actual fun append(value: Float): StringBuilder = append(value.toString())
 
     /**
      * Appends the string representation of the specified double [value] to this string builder and returns this instance.
@@ -202,14 +202,14 @@ actual class StringBuilder private constructor (
      * The overall effect is exactly as if the [value] were converted to a string by the `value.toString()` method,
      * and then that string was appended to this string builder.
      */
-    actual fun append(value: Double): StringBuilder = append(value.toString())
+    public actual fun append(value: Double): StringBuilder = append(value.toString())
 
     /**
      * Appends characters in the specified character array [value] to this string builder and returns this instance.
      *
      * Characters are appended in order, starting at the index 0.
      */
-    actual fun append(value: CharArray): StringBuilder {
+    public actual fun append(value: CharArray): StringBuilder {
         ensureExtraCapacity(value.size)
         value.copyInto(array, _length)
         _length += value.size
@@ -221,7 +221,7 @@ actual class StringBuilder private constructor (
      *
      * If [value] is `null`, then the four characters `"null"` are appended.
      */
-    actual fun append(value: String?): StringBuilder {
+    public actual fun append(value: String?): StringBuilder {
         val toAppend = value ?: "null"
         ensureExtraCapacity(toAppend.length)
         _length += insertString(array, _length, toAppend)
@@ -233,7 +233,7 @@ actual class StringBuilder private constructor (
      *
      * The capacity is the maximum length this string builder can have before an allocation occurs.
      */
-    actual fun capacity(): Int = array.size
+    public actual fun capacity(): Int = array.size
 
     /**
      * Ensures that the capacity of this string builder is at least equal to the specified [minimumCapacity].
@@ -241,7 +241,7 @@ actual class StringBuilder private constructor (
      * If the current capacity is less than the [minimumCapacity], a new backing storage is allocated with greater capacity.
      * Otherwise, this method takes no action and simply returns.
      */
-    actual fun ensureCapacity(minimumCapacity: Int) {
+    public actual fun ensureCapacity(minimumCapacity: Int) {
         if (minimumCapacity <= array.size) return
         ensureCapacityInternal(minimumCapacity)
     }
@@ -252,7 +252,7 @@ actual class StringBuilder private constructor (
      * Returns `-1` if the specified [string] does not occur in this string builder.
      */
     @SinceKotlin("1.4")
-    actual fun indexOf(string: String): Int {
+    public actual fun indexOf(string: String): Int {
         return (this as CharSequence).indexOf(string, startIndex = 0, ignoreCase = false)
     }
 
@@ -263,7 +263,7 @@ actual class StringBuilder private constructor (
      * Returns `-1` if the specified [string] does not occur in this string builder starting at the specified [startIndex].
      */
     @SinceKotlin("1.4")
-    actual fun indexOf(string: String, startIndex: Int): Int {
+    public actual fun indexOf(string: String, startIndex: Int): Int {
         if (string.isEmpty() && startIndex >= _length) return _length
         return (this as CharSequence).indexOf(string, startIndex, ignoreCase = false)
     }
@@ -275,7 +275,7 @@ actual class StringBuilder private constructor (
      * Returns `-1` if the specified [string] does not occur in this string builder.
      */
     @SinceKotlin("1.4")
-    actual fun lastIndexOf(string: String): Int {
+    public actual fun lastIndexOf(string: String): Int {
         if (string.isEmpty()) return _length
         return (this as CharSequence).lastIndexOf(string, startIndex = lastIndex, ignoreCase = false)
     }
@@ -287,7 +287,7 @@ actual class StringBuilder private constructor (
      * Returns `-1` if the specified [string] does not occur in this string builder starting at the specified [startIndex].
      */
     @SinceKotlin("1.4")
-    actual fun lastIndexOf(string: String, startIndex: Int): Int {
+    public actual fun lastIndexOf(string: String, startIndex: Int): Int {
         if (string.isEmpty() && startIndex >= _length) return _length
         return (this as CharSequence).lastIndexOf(string, startIndex, ignoreCase = false)
     }
@@ -302,7 +302,7 @@ actual class StringBuilder private constructor (
      *
      * @throws IndexOutOfBoundsException if [index] is less than zero or greater than the length of this string builder.
      */
-    actual fun insert(index: Int, value: Boolean): StringBuilder = insert(index, value.toString())
+    public actual fun insert(index: Int, value: Boolean): StringBuilder = insert(index, value.toString())
 
     /**
      * Inserts the string representation of the specified byte [value] into this string builder at the specified [index] and returns this instance.
@@ -312,7 +312,7 @@ actual class StringBuilder private constructor (
      *
      * @throws IndexOutOfBoundsException if [index] is less than zero or greater than the length of this string builder.
      */
-    actual fun insert(index: Int, value: Byte): StringBuilder = insert(index, value.toString())
+    public actual fun insert(index: Int, value: Byte): StringBuilder = insert(index, value.toString())
 
     /**
      * Inserts the string representation of the specified short [value] into this string builder at the specified [index] and returns this instance.
@@ -322,7 +322,7 @@ actual class StringBuilder private constructor (
      *
      * @throws IndexOutOfBoundsException if [index] is less than zero or greater than the length of this string builder.
      */
-    actual fun insert(index: Int, value: Short): StringBuilder = insert(index, value.toString())
+    public actual fun insert(index: Int, value: Short): StringBuilder = insert(index, value.toString())
 
     /**
      * Inserts the string representation of the specified int [value] into this string builder at the specified [index] and returns this instance.
@@ -332,7 +332,7 @@ actual class StringBuilder private constructor (
      *
      * @throws IndexOutOfBoundsException if [index] is less than zero or greater than the length of this string builder.
      */
-    actual fun insert(index: Int, value: Int): StringBuilder = insert(index, value.toString())
+    public actual fun insert(index: Int, value: Int): StringBuilder = insert(index, value.toString())
 
     /**
      * Inserts the string representation of the specified long [value] into this string builder at the specified [index] and returns this instance.
@@ -342,7 +342,7 @@ actual class StringBuilder private constructor (
      *
      * @throws IndexOutOfBoundsException if [index] is less than zero or greater than the length of this string builder.
      */
-    actual fun insert(index: Int, value: Long): StringBuilder = insert(index, value.toString())
+    public actual fun insert(index: Int, value: Long): StringBuilder = insert(index, value.toString())
 
     /**
      * Inserts the string representation of the specified float [value] into this string builder at the specified [index] and returns this instance.
@@ -352,7 +352,7 @@ actual class StringBuilder private constructor (
      *
      * @throws IndexOutOfBoundsException if [index] is less than zero or greater than the length of this string builder.
      */
-    actual fun insert(index: Int, value: Float): StringBuilder = insert(index, value.toString())
+    public actual fun insert(index: Int, value: Float): StringBuilder = insert(index, value.toString())
 
     /**
      * Inserts the string representation of the specified double [value] into this string builder at the specified [index] and returns this instance.
@@ -362,14 +362,14 @@ actual class StringBuilder private constructor (
      *
      * @throws IndexOutOfBoundsException if [index] is less than zero or greater than the length of this string builder.
      */
-    actual fun insert(index: Int, value: Double): StringBuilder = insert(index, value.toString())
+    public actual fun insert(index: Int, value: Double): StringBuilder = insert(index, value.toString())
 
     /**
      * Inserts the specified character [value] into this string builder at the specified [index] and returns this instance.
      *
      * @throws IndexOutOfBoundsException if [index] is less than zero or greater than the length of this string builder.
      */
-    actual fun insert(index: Int, value: Char): StringBuilder {
+    public actual fun insert(index: Int, value: Char): StringBuilder {
         AbstractList.checkPositionIndex(index, _length)
         ensureExtraCapacity(1)
         val newLastIndex = lastIndex + 1
@@ -388,7 +388,7 @@ actual class StringBuilder private constructor (
      *
      * @throws IndexOutOfBoundsException if [index] is less than zero or greater than the length of this string builder.
      */
-    actual fun insert(index: Int, value: CharArray): StringBuilder {
+    public actual fun insert(index: Int, value: CharArray): StringBuilder {
         AbstractList.checkPositionIndex(index, _length)
         ensureExtraCapacity(value.size)
 
@@ -409,7 +409,7 @@ actual class StringBuilder private constructor (
      *
      * @throws IndexOutOfBoundsException if [index] is less than zero or greater than the length of this string builder.
      */
-    actual fun insert(index: Int, value: CharSequence?): StringBuilder {
+    public actual fun insert(index: Int, value: CharSequence?): StringBuilder {
         // Kotlin/JVM inserts the "null" string if the argument is null.
         val toInsert = value ?: "null"
         return insertRange(index, toInsert, 0, toInsert.length)
@@ -423,7 +423,7 @@ actual class StringBuilder private constructor (
      *
      * @throws IndexOutOfBoundsException if [index] is less than zero or greater than the length of this string builder.
      */
-    actual fun insert(index: Int, value: Any?): StringBuilder = insert(index, value.toString())
+    public actual fun insert(index: Int, value: Any?): StringBuilder = insert(index, value.toString())
 
     /**
      * Inserts the string [value] into this string builder at the specified [index] and returns this instance.
@@ -432,7 +432,7 @@ actual class StringBuilder private constructor (
      *
      * @throws IndexOutOfBoundsException if [index] is less than zero or greater than the length of this string builder.
      */
-    actual fun insert(index: Int, value: String?): StringBuilder {
+    public actual fun insert(index: Int, value: String?): StringBuilder {
         val toInsert = value ?: "null"
         AbstractList.checkPositionIndex(index, _length)
         ensureExtraCapacity(toInsert.length)
@@ -452,7 +452,7 @@ actual class StringBuilder private constructor (
      *
      *  @throws IndexOutOfBoundsException or [IllegalArgumentException] if [newLength] is less than zero.
      */
-    actual fun setLength(newLength: Int) {
+    public actual fun setLength(newLength: Int) {
         if (newLength < 0) {
             throw IllegalArgumentException("Negative new length: $newLength.")
         }
@@ -469,7 +469,7 @@ actual class StringBuilder private constructor (
      *
      * @throws IndexOutOfBoundsException or [IllegalArgumentException] when [startIndex] or [endIndex] is out of range of this string builder indices or when `startIndex > endIndex`.
      */
-    actual fun substring(startIndex: Int, endIndex: Int): String {
+    public actual fun substring(startIndex: Int, endIndex: Int): String {
         AbstractList.checkBoundsIndexes(startIndex, endIndex, _length)
         return unsafeStringFromCharArray(array, startIndex, endIndex - startIndex)
     }
@@ -480,7 +480,7 @@ actual class StringBuilder private constructor (
      * @throws IndexOutOfBoundsException if [startIndex] is less than zero or greater than the length of this string builder.
      */
     @SinceKotlin("1.4")
-    actual fun substring(startIndex: Int): String {
+    public actual fun substring(startIndex: Int): String {
         return substring(startIndex, _length)
     }
 
@@ -491,7 +491,7 @@ actual class StringBuilder private constructor (
      * then it may be resized to become more space efficient.
      * Calling this method may, but is not required to, affect the value of the [capacity] property.
      */
-    actual fun trimToSize() {
+    public actual fun trimToSize() {
         if (_length < array.size)
             array = array.copyOf(_length)
     }
@@ -503,7 +503,7 @@ actual class StringBuilder private constructor (
      *
      * @throws IndexOutOfBoundsException if [index] is out of bounds of this string builder.
      */
-    operator fun set(index: Int, value: Char) {
+    public operator fun set(index: Int, value: Char) {
         AbstractList.checkElementIndex(index, _length)
         array[index] = value
     }
@@ -518,7 +518,7 @@ actual class StringBuilder private constructor (
      * @throws IndexOutOfBoundsException or [IllegalArgumentException] if [startIndex] is less than zero, greater than the length of this string builder, or `startIndex > endIndex`.
      */
     @SinceKotlin("1.4")
-    fun setRange(startIndex: Int, endIndex: Int, value: String): StringBuilder {
+    public fun setRange(startIndex: Int, endIndex: Int, value: String): StringBuilder {
         checkReplaceRange(startIndex, endIndex, _length)
 
         val coercedEndIndex = endIndex.coerceAtMost(_length)
@@ -542,7 +542,7 @@ actual class StringBuilder private constructor (
      * @throws IndexOutOfBoundsException if [index] is out of bounds of this string builder.
      */
     @SinceKotlin("1.4")
-    fun deleteAt(index: Int): StringBuilder {
+    public fun deleteAt(index: Int): StringBuilder {
         AbstractList.checkElementIndex(index, _length)
         array.copyInto(array, startIndex = index + 1, endIndex = _length, destinationOffset = index)
         --_length
@@ -558,7 +558,7 @@ actual class StringBuilder private constructor (
      * @throws IndexOutOfBoundsException or [IllegalArgumentException] when [startIndex] is out of range of this string builder indices or when `startIndex > endIndex`.
      */
     @SinceKotlin("1.4")
-    fun deleteRange(startIndex: Int, endIndex: Int): StringBuilder {
+    public fun deleteRange(startIndex: Int, endIndex: Int): StringBuilder {
         checkReplaceRange(startIndex, endIndex, _length)
 
         val coercedEndIndex = endIndex.coerceAtMost(_length)
@@ -580,7 +580,7 @@ actual class StringBuilder private constructor (
      *  or when that index is out of the [destination] array indices range.
      */
     @SinceKotlin("1.4")
-    fun toCharArray(destination: CharArray, destinationOffset: Int = 0, startIndex: Int = 0, endIndex: Int = this.length) {
+    public fun toCharArray(destination: CharArray, destinationOffset: Int = 0, startIndex: Int = 0, endIndex: Int = this.length) {
         AbstractList.checkBoundsIndexes(startIndex, endIndex, _length)
         AbstractList.checkBoundsIndexes(destinationOffset, destinationOffset + endIndex - startIndex, destination.size)
 
@@ -599,7 +599,7 @@ actual class StringBuilder private constructor (
      * @throws IndexOutOfBoundsException or [IllegalArgumentException] when [startIndex] or [endIndex] is out of range of the [value] array indices or when `startIndex > endIndex`.
      */
     @SinceKotlin("1.4")
-    fun appendRange(value: CharArray, startIndex: Int, endIndex: Int): StringBuilder {
+    public fun appendRange(value: CharArray, startIndex: Int, endIndex: Int): StringBuilder {
         AbstractList.checkBoundsIndexes(startIndex, endIndex, value.size)
         val extraLength = endIndex - startIndex
         ensureExtraCapacity(extraLength)
@@ -618,7 +618,7 @@ actual class StringBuilder private constructor (
      * @throws IndexOutOfBoundsException or [IllegalArgumentException] when [startIndex] or [endIndex] is out of range of the [value] character sequence indices or when `startIndex > endIndex`.
      */
     @SinceKotlin("1.4")
-    fun appendRange(value: CharSequence, startIndex: Int, endIndex: Int): StringBuilder {
+    public fun appendRange(value: CharSequence, startIndex: Int, endIndex: Int): StringBuilder {
         AbstractList.checkBoundsIndexes(startIndex, endIndex, value.length)
         val extraLength = endIndex - startIndex
         ensureExtraCapacity(extraLength)
@@ -646,7 +646,7 @@ actual class StringBuilder private constructor (
      * @throws IndexOutOfBoundsException if [index] is less than zero or greater than the length of this string builder.
      */
     @SinceKotlin("1.4")
-    fun insertRange(index: Int, value: CharSequence, startIndex: Int, endIndex: Int): StringBuilder {
+    public fun insertRange(index: Int, value: CharSequence, startIndex: Int, endIndex: Int): StringBuilder {
         AbstractList.checkBoundsIndexes(startIndex, endIndex, value.length)
         AbstractList.checkPositionIndex(index, _length)
         val extraLength = endIndex - startIndex
@@ -677,7 +677,7 @@ actual class StringBuilder private constructor (
      * @throws IndexOutOfBoundsException if [index] is less than zero or greater than the length of this string builder.
      */
     @SinceKotlin("1.4")
-    fun insertRange(index: Int, value: CharArray, startIndex: Int, endIndex: Int): StringBuilder {
+    public fun insertRange(index: Int, value: CharArray, startIndex: Int, endIndex: Int): StringBuilder {
         AbstractList.checkPositionIndex(index, _length)
         AbstractList.checkBoundsIndexes(startIndex, endIndex, value.size)
 
@@ -788,7 +788,7 @@ public actual inline fun StringBuilder.deleteRange(startIndex: Int, endIndex: In
 @SinceKotlin("1.4")
 @Suppress("EXTENSION_SHADOWED_BY_MEMBER", "ACTUAL_FUNCTION_WITH_DEFAULT_ARGUMENTS")
 @kotlin.internal.InlineOnly
-public actual inline fun StringBuilder.toCharArray(destination: CharArray, destinationOffset: Int = 0, startIndex: Int = 0, endIndex: Int = this.length) =
+public actual inline fun StringBuilder.toCharArray(destination: CharArray, destinationOffset: Int = 0, startIndex: Int = 0, endIndex: Int = this.length): Unit =
         this.toCharArray(destination, destinationOffset, startIndex, endIndex)
 
 /**
@@ -892,7 +892,7 @@ public inline fun StringBuilder.insert(index: Int, csq: CharSequence?, start: In
 @DeprecatedSinceKotlin(warningSince = "1.3", errorSince = "1.6")
 @Deprecated("Use set(index: Int, value: Char) instead", ReplaceWith("set(index, value)"))
 @kotlin.internal.InlineOnly
-public inline fun StringBuilder.setCharAt(index: Int, value: Char) = this.set(index, value)
+public inline fun StringBuilder.setCharAt(index: Int, value: Char): Unit = this.set(index, value)
 
 /**
  * Removes the character at the specified [index] from this string builder and returns this instance.
@@ -906,4 +906,4 @@ public inline fun StringBuilder.setCharAt(index: Int, value: Char) = this.set(in
 @DeprecatedSinceKotlin(warningSince = "1.4", errorSince = "1.6")
 @Deprecated("Use deleteAt(index: Int) instead", ReplaceWith("deleteAt(index)"))
 @kotlin.internal.InlineOnly
-public inline fun StringBuilder.deleteCharAt(index: Int) = this.deleteAt(index)
+public inline fun StringBuilder.deleteCharAt(index: Int): StringBuilder = this.deleteAt(index)
diff --git a/libraries/stdlib/src/kotlin/text/StringBuilder.kt b/libraries/stdlib/src/kotlin/text/StringBuilder.kt
index a961825e075..9bd6a469cff 100644
--- a/libraries/stdlib/src/kotlin/text/StringBuilder.kt
+++ b/libraries/stdlib/src/kotlin/text/StringBuilder.kt
@@ -16,20 +16,20 @@ import kotlin.contracts.*
  *
  * String builder can be used to efficiently perform multiple string manipulation operations.
  */
-expect class StringBuilder : Appendable, CharSequence {
+public expect class StringBuilder : Appendable, CharSequence {
     /** Constructs an empty string builder. */
-    constructor()
+    public constructor()
 
     /** Constructs an empty string builder with the specified initial [capacity]. */
-    constructor(capacity: Int)
+    public constructor(capacity: Int)
 
     /** Constructs a string builder that contains the same characters as the specified [content] char sequence. */
-    constructor(content: CharSequence)
+    public constructor(content: CharSequence)
 
     /** Constructs a string builder that contains the same characters as the specified [content] string. */
     @SinceKotlin("1.3")
 //    @ExperimentalStdlibApi
-    constructor(content: String)
+    public constructor(content: String)
 
     override val length: Int
 
@@ -50,7 +50,7 @@ expect class StringBuilder : Appendable, CharSequence {
      * Note that the reverse operation may produce new surrogate pairs that were unpaired low-surrogates and high-surrogates before the operation.
      * For example, reversing `"\uDC00\uD800"` produces `"\uD800\uDC00"` which is a valid surrogate pair.
      */
-    fun reverse(): StringBuilder
+    public fun reverse(): StringBuilder
 
     /**
      * Appends the string representation of the specified object [value] to this string builder and returns this instance.
@@ -58,7 +58,7 @@ expect class StringBuilder : Appendable, CharSequence {
      * The overall effect is exactly as if the [value] were converted to a string by the `value.toString()` method,
      * and then that string was appended to this string builder.
      */
-    fun append(value: Any?): StringBuilder
+    public fun append(value: Any?): StringBuilder
 
     /**
      * Appends the string representation of the specified boolean [value] to this string builder and returns this instance.
@@ -67,7 +67,7 @@ expect class StringBuilder : Appendable, CharSequence {
      * and then that string was appended to this string builder.
      */
     @SinceKotlin("1.3")
-    fun append(value: Boolean): StringBuilder
+    public fun append(value: Boolean): StringBuilder
 
     /**
      * Appends the string representation of the specified byte [value] to this string builder and returns this instance.
@@ -76,7 +76,7 @@ expect class StringBuilder : Appendable, CharSequence {
      * and then that string was appended to this string builder.
      */
     @SinceKotlin("1.9")
-    fun append(value: Byte): StringBuilder
+    public fun append(value: Byte): StringBuilder
 
     /**
      * Appends the string representation of the specified short [value] to this string builder and returns this instance.
@@ -85,7 +85,7 @@ expect class StringBuilder : Appendable, CharSequence {
      * and then that string was appended to this string builder.
      */
     @SinceKotlin("1.9")
-    fun append(value: Short): StringBuilder
+    public fun append(value: Short): StringBuilder
 
     /**
      * Appends the string representation of the specified int [value] to this string builder and returns this instance.
@@ -94,7 +94,7 @@ expect class StringBuilder : Appendable, CharSequence {
      * and then that string was appended to this string builder.
      */
     @SinceKotlin("1.9")
-    fun append(value: Int): StringBuilder
+    public fun append(value: Int): StringBuilder
 
     /**
      * Appends the string representation of the specified long [value] to this string builder and returns this instance.
@@ -103,7 +103,7 @@ expect class StringBuilder : Appendable, CharSequence {
      * and then that string was appended to this string builder.
      */
     @SinceKotlin("1.9")
-    fun append(value: Long): StringBuilder
+    public fun append(value: Long): StringBuilder
 
     /**
      * Appends the string representation of the specified float [value] to this string builder and returns this instance.
@@ -112,7 +112,7 @@ expect class StringBuilder : Appendable, CharSequence {
      * and then that string was appended to this string builder.
      */
     @SinceKotlin("1.9")
-    fun append(value: Float): StringBuilder
+    public fun append(value: Float): StringBuilder
 
     /**
      * Appends the string representation of the specified double [value] to this string builder and returns this instance.
@@ -121,7 +121,7 @@ expect class StringBuilder : Appendable, CharSequence {
      * and then that string was appended to this string builder.
      */
     @SinceKotlin("1.9")
-    fun append(value: Double): StringBuilder
+    public fun append(value: Double): StringBuilder
 
     /**
      * Appends characters in the specified character array [value] to this string builder and returns this instance.
@@ -129,7 +129,7 @@ expect class StringBuilder : Appendable, CharSequence {
      * Characters are appended in order, starting at the index 0.
      */
     @SinceKotlin("1.4")
-    fun append(value: CharArray): StringBuilder
+    public fun append(value: CharArray): StringBuilder
 
     /**
      * Appends the specified string [value] to this string builder and returns this instance.
@@ -137,7 +137,7 @@ expect class StringBuilder : Appendable, CharSequence {
      * If [value] is `null`, then the four characters `"null"` are appended.
      */
     @SinceKotlin("1.3")
-    fun append(value: String?): StringBuilder
+    public fun append(value: String?): StringBuilder
 
     /**
      * Returns the current capacity of this string builder.
@@ -147,7 +147,7 @@ expect class StringBuilder : Appendable, CharSequence {
      * In Kotlin/JS implementation of StringBuilder the value returned from this method may not indicate the actual size of the backing storage.
      */
     @SinceKotlin("1.3")
-    fun capacity(): Int
+    public fun capacity(): Int
 
     /**
      * Ensures that the capacity of this string builder is at least equal to the specified [minimumCapacity].
@@ -156,7 +156,7 @@ expect class StringBuilder : Appendable, CharSequence {
      * Otherwise, this method takes no action and simply returns.
      */
     @SinceKotlin("1.4")
-    fun ensureCapacity(minimumCapacity: Int)
+    public fun ensureCapacity(minimumCapacity: Int)
 
     /**
      * Returns the index within this string builder of the first occurrence of the specified [string].
@@ -164,7 +164,7 @@ expect class StringBuilder : Appendable, CharSequence {
      * Returns `-1` if the specified [string] does not occur in this string builder.
      */
     @SinceKotlin("1.4")
-    fun indexOf(string: String): Int
+    public fun indexOf(string: String): Int
 
     /**
      * Returns the index within this string builder of the first occurrence of the specified [string],
@@ -173,7 +173,7 @@ expect class StringBuilder : Appendable, CharSequence {
      * Returns `-1` if the specified [string] does not occur in this string builder starting at the specified [startIndex].
      */
     @SinceKotlin("1.4")
-    fun indexOf(string: String, startIndex: Int): Int
+    public fun indexOf(string: String, startIndex: Int): Int
 
     /**
      * Returns the index within this string builder of the last occurrence of the specified [string].
@@ -182,7 +182,7 @@ expect class StringBuilder : Appendable, CharSequence {
      * Returns `-1` if the specified [string] does not occur in this string builder.
      */
     @SinceKotlin("1.4")
-    fun lastIndexOf(string: String): Int
+    public fun lastIndexOf(string: String): Int
 
     /**
      * Returns the index within this string builder of the last occurrence of the specified [string],
@@ -191,7 +191,7 @@ expect class StringBuilder : Appendable, CharSequence {
      * Returns `-1` if the specified [string] does not occur in this string builder starting at the specified [startIndex].
      */
     @SinceKotlin("1.4")
-    fun lastIndexOf(string: String, startIndex: Int): Int
+    public fun lastIndexOf(string: String, startIndex: Int): Int
 
     /**
      * Inserts the string representation of the specified boolean [value] into this string builder at the specified [index] and returns this instance.
@@ -202,7 +202,7 @@ expect class StringBuilder : Appendable, CharSequence {
      * @throws IndexOutOfBoundsException if [index] is less than zero or greater than the length of this string builder.
      */
     @SinceKotlin("1.4")
-    fun insert(index: Int, value: Boolean): StringBuilder
+    public fun insert(index: Int, value: Boolean): StringBuilder
 
     /**
      * Inserts the string representation of the specified byte [value] into this string builder at the specified [index] and returns this instance.
@@ -213,7 +213,7 @@ expect class StringBuilder : Appendable, CharSequence {
      * @throws IndexOutOfBoundsException if [index] is less than zero or greater than the length of this string builder.
      */
     @SinceKotlin("1.9")
-    fun insert(index: Int, value: Byte): StringBuilder
+    public fun insert(index: Int, value: Byte): StringBuilder
 
     /**
      * Inserts the string representation of the specified short [value] into this string builder at the specified [index] and returns this instance.
@@ -224,7 +224,7 @@ expect class StringBuilder : Appendable, CharSequence {
      * @throws IndexOutOfBoundsException if [index] is less than zero or greater than the length of this string builder.
      */
     @SinceKotlin("1.9")
-    fun insert(index: Int, value: Short): StringBuilder
+    public fun insert(index: Int, value: Short): StringBuilder
 
     /**
      * Inserts the string representation of the specified int [value] into this string builder at the specified [index] and returns this instance.
@@ -235,7 +235,7 @@ expect class StringBuilder : Appendable, CharSequence {
      * @throws IndexOutOfBoundsException if [index] is less than zero or greater than the length of this string builder.
      */
     @SinceKotlin("1.9")
-    fun insert(index: Int, value: Int): StringBuilder
+    public fun insert(index: Int, value: Int): StringBuilder
 
     /**
      * Inserts the string representation of the specified long [value] into this string builder at the specified [index] and returns this instance.
@@ -246,7 +246,7 @@ expect class StringBuilder : Appendable, CharSequence {
      * @throws IndexOutOfBoundsException if [index] is less than zero or greater than the length of this string builder.
      */
     @SinceKotlin("1.9")
-    fun insert(index: Int, value: Long): StringBuilder
+    public fun insert(index: Int, value: Long): StringBuilder
 
     /**
      * Inserts the string representation of the specified float [value] into this string builder at the specified [index] and returns this instance.
@@ -257,7 +257,7 @@ expect class StringBuilder : Appendable, CharSequence {
      * @throws IndexOutOfBoundsException if [index] is less than zero or greater than the length of this string builder.
      */
     @SinceKotlin("1.9")
-    fun insert(index: Int, value: Float): StringBuilder
+    public fun insert(index: Int, value: Float): StringBuilder
 
     /**
      * Inserts the string representation of the specified double [value] into this string builder at the specified [index] and returns this instance.
@@ -268,7 +268,7 @@ expect class StringBuilder : Appendable, CharSequence {
      * @throws IndexOutOfBoundsException if [index] is less than zero or greater than the length of this string builder.
      */
     @SinceKotlin("1.9")
-    fun insert(index: Int, value: Double): StringBuilder
+    public fun insert(index: Int, value: Double): StringBuilder
 
     /**
      * Inserts the specified character [value] into this string builder at the specified [index] and returns this instance.
@@ -276,7 +276,7 @@ expect class StringBuilder : Appendable, CharSequence {
      * @throws IndexOutOfBoundsException if [index] is less than zero or greater than the length of this string builder.
      */
     @SinceKotlin("1.4")
-    fun insert(index: Int, value: Char): StringBuilder
+    public fun insert(index: Int, value: Char): StringBuilder
 
     /**
      * Inserts characters in the specified character array [value] into this string builder at the specified [index] and returns this instance.
@@ -286,7 +286,7 @@ expect class StringBuilder : Appendable, CharSequence {
      * @throws IndexOutOfBoundsException if [index] is less than zero or greater than the length of this string builder.
      */
     @SinceKotlin("1.4")
-    fun insert(index: Int, value: CharArray): StringBuilder
+    public fun insert(index: Int, value: CharArray): StringBuilder
 
     /**
      * Inserts characters in the specified character sequence [value] into this string builder at the specified [index] and returns this instance.
@@ -299,7 +299,7 @@ expect class StringBuilder : Appendable, CharSequence {
      * @throws IndexOutOfBoundsException if [index] is less than zero or greater than the length of this string builder.
      */
     @SinceKotlin("1.4")
-    fun insert(index: Int, value: CharSequence?): StringBuilder
+    public fun insert(index: Int, value: CharSequence?): StringBuilder
 
     /**
      * Inserts the string representation of the specified object [value] into this string builder at the specified [index] and returns this instance.
@@ -310,7 +310,7 @@ expect class StringBuilder : Appendable, CharSequence {
      * @throws IndexOutOfBoundsException if [index] is less than zero or greater than the length of this string builder.
      */
     @SinceKotlin("1.4")
-    fun insert(index: Int, value: Any?): StringBuilder
+    public fun insert(index: Int, value: Any?): StringBuilder
 
     /**
      * Inserts the string [value] into this string builder at the specified [index] and returns this instance.
@@ -320,7 +320,7 @@ expect class StringBuilder : Appendable, CharSequence {
      * @throws IndexOutOfBoundsException if [index] is less than zero or greater than the length of this string builder.
      */
     @SinceKotlin("1.4")
-    fun insert(index: Int, value: String?): StringBuilder
+    public fun insert(index: Int, value: String?): StringBuilder
 
     /**
      *  Sets the length of this string builder to the specified [newLength].
@@ -334,7 +334,7 @@ expect class StringBuilder : Appendable, CharSequence {
      *  @throws IndexOutOfBoundsException or [IllegalArgumentException] if [newLength] is less than zero.
      */
     @SinceKotlin("1.4")
-    fun setLength(newLength: Int)
+    public fun setLength(newLength: Int)
 
     /**
      * Returns a new [String] that contains characters in this string builder at [startIndex] (inclusive) and up to the [length] (exclusive).
@@ -342,7 +342,7 @@ expect class StringBuilder : Appendable, CharSequence {
      * @throws IndexOutOfBoundsException if [startIndex] is less than zero or greater than the length of this string builder.
      */
     @SinceKotlin("1.4")
-    fun substring(startIndex: Int): String
+    public fun substring(startIndex: Int): String
 
     /**
      * Returns a new [String] that contains characters in this string builder at [startIndex] (inclusive) and up to the [endIndex] (exclusive).
@@ -350,7 +350,7 @@ expect class StringBuilder : Appendable, CharSequence {
      * @throws IndexOutOfBoundsException or [IllegalArgumentException] when [startIndex] or [endIndex] is out of range of this string builder indices or when `startIndex > endIndex`.
      */
     @SinceKotlin("1.4")
-    fun substring(startIndex: Int, endIndex: Int): String
+    public fun substring(startIndex: Int, endIndex: Int): String
 
     /**
      * Attempts to reduce storage used for this string builder.
@@ -360,7 +360,7 @@ expect class StringBuilder : Appendable, CharSequence {
      * Calling this method may, but is not required to, affect the value of the [capacity] property.
      */
     @SinceKotlin("1.4")
-    fun trimToSize()
+    public fun trimToSize()
 }