diff --git a/js/js.libraries/src/generated/org.khronos.webgl.kt b/js/js.libraries/src/generated/org.khronos.webgl.kt
index a6d80b15473..f1d3e7315e1 100644
--- a/js/js.libraries/src/generated/org.khronos.webgl.kt
+++ b/js/js.libraries/src/generated/org.khronos.webgl.kt
@@ -562,11 +562,7 @@ native public open class ArrayBuffer(length: Int) : Transferable {
     fun slice(begin: Int, end: Int = noImpl): ArrayBuffer = noImpl
 }
 
-native public open class Int8Array : ArrayBufferView {
-    constructor(length: Int) : super()
-    constructor(array: Int8Array) : super()
-    constructor(array: Array<Byte>) : super()
-    constructor(buffer: ArrayBuffer, byteOffset: Int = noImpl, length: Int = noImpl) : super()
+native public open class Int8Array(length: Int) : ArrayBufferView {
     var length: Int
         get() = noImpl
         set(value) = noImpl
@@ -590,11 +586,7 @@ native public open class Int8Array : ArrayBufferView {
     }
 }
 
-native public open class Uint8Array : ArrayBufferView {
-    constructor(length: Int) : super()
-    constructor(array: Uint8Array) : super()
-    constructor(array: Array<Byte>) : super()
-    constructor(buffer: ArrayBuffer, byteOffset: Int = noImpl, length: Int = noImpl) : super()
+native public open class Uint8Array(length: Int) : ArrayBufferView {
     var length: Int
         get() = noImpl
         set(value) = noImpl
@@ -618,11 +610,7 @@ native public open class Uint8Array : ArrayBufferView {
     }
 }
 
-native public open class Uint8ClampedArray : ArrayBufferView {
-    constructor(length: Int) : super()
-    constructor(array: Uint8ClampedArray) : super()
-    constructor(array: Array<Byte>) : super()
-    constructor(buffer: ArrayBuffer, byteOffset: Int = noImpl, length: Int = noImpl) : super()
+native public open class Uint8ClampedArray(length: Int) : ArrayBufferView {
     var length: Int
         get() = noImpl
         set(value) = noImpl
@@ -646,11 +634,7 @@ native public open class Uint8ClampedArray : ArrayBufferView {
     }
 }
 
-native public open class Int16Array : ArrayBufferView {
-    constructor(length: Int) : super()
-    constructor(array: Int16Array) : super()
-    constructor(array: Array<Short>) : super()
-    constructor(buffer: ArrayBuffer, byteOffset: Int = noImpl, length: Int = noImpl) : super()
+native public open class Int16Array(length: Int) : ArrayBufferView {
     var length: Int
         get() = noImpl
         set(value) = noImpl
@@ -674,11 +658,7 @@ native public open class Int16Array : ArrayBufferView {
     }
 }
 
-native public open class Uint16Array : ArrayBufferView {
-    constructor(length: Int) : super()
-    constructor(array: Uint16Array) : super()
-    constructor(array: Array<Short>) : super()
-    constructor(buffer: ArrayBuffer, byteOffset: Int = noImpl, length: Int = noImpl) : super()
+native public open class Uint16Array(length: Int) : ArrayBufferView {
     var length: Int
         get() = noImpl
         set(value) = noImpl
@@ -702,11 +682,7 @@ native public open class Uint16Array : ArrayBufferView {
     }
 }
 
-native public open class Int32Array : ArrayBufferView {
-    constructor(length: Int) : super()
-    constructor(array: Int32Array) : super()
-    constructor(array: Array<Int>) : super()
-    constructor(buffer: ArrayBuffer, byteOffset: Int = noImpl, length: Int = noImpl) : super()
+native public open class Int32Array(length: Int) : ArrayBufferView {
     var length: Int
         get() = noImpl
         set(value) = noImpl
@@ -730,11 +706,7 @@ native public open class Int32Array : ArrayBufferView {
     }
 }
 
-native public open class Uint32Array : ArrayBufferView {
-    constructor(length: Int) : super()
-    constructor(array: Uint32Array) : super()
-    constructor(array: Array<Int>) : super()
-    constructor(buffer: ArrayBuffer, byteOffset: Int = noImpl, length: Int = noImpl) : super()
+native public open class Uint32Array(length: Int) : ArrayBufferView {
     var length: Int
         get() = noImpl
         set(value) = noImpl
@@ -758,11 +730,7 @@ native public open class Uint32Array : ArrayBufferView {
     }
 }
 
-native public open class Float32Array : ArrayBufferView {
-    constructor(length: Int) : super()
-    constructor(array: Float32Array) : super()
-    constructor(array: Array<Float>) : super()
-    constructor(buffer: ArrayBuffer, byteOffset: Int = noImpl, length: Int = noImpl) : super()
+native public open class Float32Array(length: Int) : ArrayBufferView {
     var length: Int
         get() = noImpl
         set(value) = noImpl
@@ -786,11 +754,7 @@ native public open class Float32Array : ArrayBufferView {
     }
 }
 
-native public open class Float64Array : ArrayBufferView {
-    constructor(length: Int) : super()
-    constructor(array: Float64Array) : super()
-    constructor(array: Array<Double>) : super()
-    constructor(buffer: ArrayBuffer, byteOffset: Int = noImpl, length: Int = noImpl) : super()
+native public open class Float64Array(length: Int) : ArrayBufferView {
     var length: Int
         get() = noImpl
         set(value) = noImpl
diff --git a/js/js.libraries/src/generated/org.w3c.dom.kt b/js/js.libraries/src/generated/org.w3c.dom.kt
index d7d00ca7a7a..a5dbd0c823a 100644
--- a/js/js.libraries/src/generated/org.w3c.dom.kt
+++ b/js/js.libraries/src/generated/org.w3c.dom.kt
@@ -2810,8 +2810,7 @@ native public open class CanvasRenderingContext2DSettings {
     var alpha: Boolean = true
 }
 
-native public open class CanvasRenderingContext2D() : RenderingContext, CanvasImageSource, ImageBitmapSource {
-    constructor(width: Int, height: Int) : this()
+native public open class CanvasRenderingContext2D : RenderingContext, CanvasImageSource, ImageBitmapSource {
     var canvas: HTMLCanvasElement
         get() = noImpl
         set(value) = noImpl
@@ -2995,9 +2994,7 @@ native public open class HitRegionOptions {
     var role: String? = null
 }
 
-native public open class ImageData : ImageBitmapSource {
-    constructor(sw: Int, sh: Int) : super()
-    constructor(data: Uint8ClampedArray, sw: Int, sh: Int = noImpl) : super()
+native public open class ImageData(sw: Int, sh: Int) : ImageBitmapSource {
     var width: Int
         get() = noImpl
         set(value) = noImpl
@@ -3041,10 +3038,7 @@ native public open class DrawingStyle(scope: Element = noImpl) {
     fun getLineDash(): Array<Double> = noImpl
 }
 
-native public open class Path2D() {
-    constructor(path: Path2D) : this()
-    constructor(paths: Array<Path2D>, fillRule: String = "nonzero") : this()
-    constructor(d: String) : this()
+native public open class Path2D {
     fun addPath(path: Path2D, transformation: SVGMatrix? = null): Unit = noImpl
     fun addPathByStrokingPath(path: Path2D, styles: dynamic, transformation: SVGMatrix? = null): Unit = noImpl
     fun addText(text: String, styles: dynamic, transformation: SVGMatrix?, x: Double, y: Double, maxWidth: Double = noImpl): Unit = noImpl
@@ -5036,9 +5030,7 @@ native public open class DOMPointReadOnly(x: Double, y: Double, z: Double, w: Do
     fun matrixTransform(matrix: DOMMatrixReadOnly): DOMPoint = noImpl
 }
 
-native public open class DOMPoint : DOMPointReadOnly {
-    constructor(point: DOMPointInit = noImpl) : super(noImpl, noImpl, noImpl, noImpl)
-    constructor(x: Double = 0.0, y: Double = 0.0, z: Double = 0.0, w: Double = 1.0) : super(x, y, z, w)
+native public open class DOMPoint(point: DOMPointInit = noImpl) : DOMPointReadOnly(noImpl, noImpl, noImpl, noImpl) {
 }
 
 native public open class DOMPointInit {
@@ -5085,9 +5077,7 @@ native public open class DOMRectInit {
     var height: Double = 0.0
 }
 
-native public open class DOMQuad {
-    constructor(p1: DOMPointInit = noImpl, p2: DOMPointInit = noImpl, p3: DOMPointInit = noImpl, p4: DOMPointInit = noImpl) : super()
-    constructor(rect: DOMRectInit = noImpl) : super()
+native public open class DOMQuad(p1: DOMPointInit = noImpl, p2: DOMPointInit = noImpl, p3: DOMPointInit = noImpl, p4: DOMPointInit = noImpl) {
     var p1: DOMPoint
         get() = noImpl
         set(value) = noImpl
@@ -5196,12 +5186,7 @@ native public open class DOMMatrixReadOnly(numberSequence: Array<Double>) {
     fun toFloat64Array(): Float64Array = noImpl
 }
 
-native public open class DOMMatrix() : DOMMatrixReadOnly(noImpl) {
-    constructor(transformList: String) : this()
-    constructor(other: DOMMatrixReadOnly) : this()
-    constructor(array32: Float32Array) : this()
-    constructor(array64: Float64Array) : this()
-    constructor(numberSequence: Array<Double>) : this()
+native public open class DOMMatrix : DOMMatrixReadOnly(noImpl) {
     fun multiplySelf(other: DOMMatrix): DOMMatrix = noImpl
     fun preMultiplySelf(other: DOMMatrix): DOMMatrix = noImpl
     fun translateSelf(tx: Double, ty: Double, tz: Double = 0.0): DOMMatrix = noImpl
diff --git a/js/js.libraries/src/generated/org.w3c.files.kt b/js/js.libraries/src/generated/org.w3c.files.kt
index 26002075743..8516ed9363f 100644
--- a/js/js.libraries/src/generated/org.w3c.files.kt
+++ b/js/js.libraries/src/generated/org.w3c.files.kt
@@ -20,8 +20,7 @@ import org.w3c.performance.*
 import org.w3c.workers.*
 import org.w3c.xhr.*
 
-native public open class Blob() : ImageBitmapSource {
-    constructor(blobParts: Array<dynamic>, options: BlobPropertyBag = noImpl) : this()
+native public open class Blob : ImageBitmapSource {
     var size: Long
         get() = noImpl
         set(value) = noImpl
diff --git a/libraries/tools/idl2k/src/main/kotlin/gen.kt b/libraries/tools/idl2k/src/main/kotlin/gen.kt
index 267c052c507..c49fb619af3 100644
--- a/libraries/tools/idl2k/src/main/kotlin/gen.kt
+++ b/libraries/tools/idl2k/src/main/kotlin/gen.kt
@@ -26,7 +26,7 @@ fun String.dropNullable() = when {
     else -> this
 }
 
-fun String.copyNullabilityFrom(type: String) = when {
+fun String.copyNullabilityFrom(type : String) = when {
     type.isNullable() -> ensureNullable()
     else -> this
 }
@@ -94,85 +94,54 @@ fun generateAttribute(putNoImpl: Boolean, repository: Repository, attribute: Att
         )
 
 private fun InterfaceDefinition.superTypes(repository: Repository) = superTypes.map { repository.interfaces[it] }.filterNotNull()
-private fun resolveDefinitionKind(repository: Repository, iface: InterfaceDefinition, constructors: List<ExtendedAttribute> = iface.findConstructors()): GenerateDefinitionKind =
-        if (iface.dictionary || constructors.isNotEmpty() || iface.superTypes(repository).any { resolveDefinitionKind(repository, it) == GenerateDefinitionKind.CLASS }) {
+private fun resolveDefinitionKind(repository: Repository, iface: InterfaceDefinition, constructor: ExtendedAttribute? = iface.findConstructor()): GenerateDefinitionKind =
+        if (iface.dictionary || constructor != null || iface.superTypes(repository).any { resolveDefinitionKind(repository, it) == GenerateDefinitionKind.CLASS }) {
             GenerateDefinitionKind.CLASS
-        } else {
+        }
+        else {
             GenerateDefinitionKind.TRAIT
         }
 
 private fun InterfaceDefinition.mapAttributes(repository: Repository) = attributes.map { generateAttribute(!dictionary, repository, it) }
 private fun InterfaceDefinition.mapOperations(repository: Repository) = operations.flatMap { generateFunctions(repository, it) }
-private fun Constant.mapConstant(repository: Repository) = GenerateAttribute(name, mapType(repository, type), value, false, true, false, false)
-private fun emptyConstructor() = ExtendedAttribute(null, "Constructor", emptyList())
+private fun Constant.mapConstant(repository : Repository) = GenerateAttribute(name, mapType(repository, type), value, false, true, false, false)
 
 fun generateTrait(repository: Repository, iface: InterfaceDefinition): GenerateTraitOrClass {
-    val superClasses = iface.superTypes
+    val constructor = iface.findConstructor()
+    val constructorFunction = generateFunction(repository, Operation("", "Unit", constructor?.arguments ?: emptyList(), emptyList()), functionName = "", nativeGetterOrSetter = NativeGetterOrSetter.NONE)
+    val constructorArgumentNames = constructorFunction.arguments.map { it.name }.toSet()
+
+    val constructorSuperCalls = iface.superTypes
             .map { repository.interfaces[it] }
             .filterNotNull()
             .filter { resolveDefinitionKind(repository, it) == GenerateDefinitionKind.CLASS }
+            .map {
+                val superConstructor = it.findConstructor()
+                GenerateFunctionCall(
+                        name = it.name,
+                        arguments = if (superConstructor == null) {
+                            emptyList()
+                        } else {
+                            superConstructor.arguments.map { arg ->
+                                if (arg.name in constructorArgumentNames) arg.name else "noImpl"
+                            }
+                        }
+                )
+            }
 
-    assert(superClasses.size() <= 1) { "Type ${iface.name} should have one or zero super classes but found ${superClasses.map { it.name }}" }
-    val superClass = superClasses.singleOrNull()
-    val superConstructor = superClass?.findConstructors()?.firstOrNull()
-
-    val declaredConstructors = iface.findConstructors()
-    val entityKind = resolveDefinitionKind(repository, iface, declaredConstructors)
+    val entityKind = resolveDefinitionKind(repository, iface, constructor)
     val extensions = repository.externals[iface.name]?.map { repository.interfaces[it] }?.filterNotNull() ?: emptyList()
 
-    val primaryConstructor = when {
-        declaredConstructors.size() == 1 -> declaredConstructors.single()
-        declaredConstructors.isEmpty() && entityKind == GenerateDefinitionKind.CLASS -> emptyConstructor()
-        else -> declaredConstructors.firstOrNull { it.arguments.isEmpty() }
-    }
-    val secondaryConstructors = declaredConstructors.filter { it != primaryConstructor }
-
-    val primaryConstructorWithCall = if (primaryConstructor != null) {
-        val constructorAsFunction = generateConstructorAsFunction(repository, primaryConstructor)
-        val superCall = when {
-            superClass != null -> superOrPrimaryConstructorCall(constructorAsFunction, superClass.name, superConstructor ?: emptyConstructor())
-            else -> null
-        }
-
-        ConstructorWithSuperTypeCall(constructorAsFunction, primaryConstructor, superCall)
-    } else null
-
-    val secondaryConstructorsWithCall = secondaryConstructors.map { secondaryConstructor ->
-        val constructorAsFunction = generateConstructorAsFunction(repository, secondaryConstructor)
-        val initCall = when {
-            primaryConstructorWithCall != null -> superOrPrimaryConstructorCall(constructorAsFunction, "this", primaryConstructorWithCall.constructorAttribute)
-            else -> superOrPrimaryConstructorCall(constructorAsFunction, "super", superConstructor ?: emptyConstructor())
-        }
-
-        ConstructorWithSuperTypeCall(constructorAsFunction, secondaryConstructor, initCall)
-    }
-
     return GenerateTraitOrClass(iface.name, iface.namespace, entityKind, iface.superTypes,
             memberAttributes = (iface.mapAttributes(repository) + extensions.flatMap { it.mapAttributes(repository) }).distinct().toList(),
             memberFunctions = (iface.mapOperations(repository) + extensions.flatMap { it.mapOperations(repository) }).distinct().toList(),
-            constants = (iface.constants.map { it.mapConstant(repository) } + extensions.flatMap { it.constants.map { it.mapConstant(repository) } }.distinct().toList()),
-            primaryConstructor = primaryConstructorWithCall,
-            secondaryConstructors = secondaryConstructorsWithCall
+            constants = (iface.constants.map {it.mapConstant(repository)} + extensions.flatMap { it.constants.map {it.mapConstant(repository)} }.distinct().toList()),
+            constructor = constructorFunction,
+            superConstructorCalls = constructorSuperCalls
     )
 }
 
-fun generateConstructorAsFunction(repository: Repository, constructor: ExtendedAttribute) = generateFunction(
-        repository,
-        Operation("", "Unit", constructor.arguments, emptyList()),
-        functionName = "",
-        nativeGetterOrSetter = NativeGetterOrSetter.NONE)
-
-fun superOrPrimaryConstructorCall(constructorAsFunction: GenerateFunction, superClassName: String, superOrPrimaryConstructor: ExtendedAttribute): GenerateFunctionCall {
-    val constructorArgumentNames = constructorAsFunction.arguments.map { it.name }.toSet()
-    return GenerateFunctionCall(
-            name = superClassName,
-            arguments = superOrPrimaryConstructor.arguments.map { arg ->
-                if (arg.name in constructorArgumentNames) arg.name else "noImpl"
-            }
-    )
-}
-
-fun mapUnionType(it: UnionType) = GenerateTraitOrClass(
+fun mapUnionType(it : UnionType) = GenerateTraitOrClass(
         name = it.name,
         namespace = it.namespace,
         kind = GenerateDefinitionKind.TRAIT,
@@ -180,16 +149,16 @@ fun mapUnionType(it: UnionType) = GenerateTraitOrClass(
         memberAttributes = emptyList(),
         memberFunctions = emptyList(),
         constants = emptyList(),
-        primaryConstructor = null,
-        secondaryConstructors = emptyList()
+        constructor = null,
+        superConstructorCalls = emptyList()
 )
 
-fun generateUnionTypeTraits(allUnionTypes: Iterable<UnionType>): List<GenerateTraitOrClass> = allUnionTypes.map(::mapUnionType)
+fun generateUnionTypeTraits(allUnionTypes : Iterable<UnionType>): List<GenerateTraitOrClass> = allUnionTypes.map(::mapUnionType)
 
 fun mapDefinitions(repository: Repository, definitions: Iterable<InterfaceDefinition>) =
         definitions.filter { "NoInterfaceObject" !in it.extendedAttributes.map { it.call } }.map { generateTrait(repository, it) }
 
-fun generateUnions(ifaces: List<GenerateTraitOrClass>, typedefs: Iterable<TypedefDefinition>): GenerateUnionTypes {
+fun generateUnions(ifaces: List<GenerateTraitOrClass>, typedefs: Iterable<TypedefDefinition>) : GenerateUnionTypes {
     val declaredTypes = ifaces.toMap { it.name }
 
     val anonymousUnionTypes = collectUnionTypes(declaredTypes)
diff --git a/libraries/tools/idl2k/src/main/kotlin/model.kt b/libraries/tools/idl2k/src/main/kotlin/model.kt
index e1035a3eeec..854b1284e55 100644
--- a/libraries/tools/idl2k/src/main/kotlin/model.kt
+++ b/libraries/tools/idl2k/src/main/kotlin/model.kt
@@ -41,7 +41,6 @@ val GenerateAttribute.signature: String
     get() = "$name:${type.typeSignature}"
 
 fun GenerateAttribute.dynamicIfUnknownType(allTypes : Set<String>, standardTypes : Set<String> = standardTypes()) = copy(type = type.dynamicIfUnknownType(allTypes, standardTypes))
-fun List<GenerateAttribute>.dynamicIfUnknownType(allTypes : Set<String>, standardTypes : Set<String> = standardTypes()) = map { it.dynamicIfUnknownType(allTypes, standardTypes) }
 
 enum class NativeGetterOrSetter {
     NONE,
@@ -73,7 +72,6 @@ data class GenerateFunction(
         val nativeGetterOrSetter: NativeGetterOrSetter
 )
 
-data class ConstructorWithSuperTypeCall(val constructor: GenerateFunction, val constructorAttribute: ExtendedAttribute, val initTypeCall: GenerateFunctionCall?)
 data class GenerateTraitOrClass(
         val name: String,
         val namespace: String,
@@ -82,9 +80,14 @@ data class GenerateTraitOrClass(
         val memberAttributes: List<GenerateAttribute>,
         val memberFunctions: List<GenerateFunction>,
         val constants: List<GenerateAttribute>,
-        val primaryConstructor: ConstructorWithSuperTypeCall?,
-        val secondaryConstructors: List<ConstructorWithSuperTypeCall>
-)
+        val constructor: GenerateFunction?,
+        val superConstructorCalls: List<GenerateFunctionCall>
+) {
+    init {
+        assert(superConstructorCalls.size() <= 1, "It shoould be zero or one super constructors")
+    }
+}
+
 
 val GenerateFunction.signature: String
     get() = arguments.map { it.type.typeSignature }.joinToString(", ", "$name(", ")")
@@ -93,9 +96,9 @@ fun GenerateFunction.dynamicIfUnknownType(allTypes : Set<String>) = standardType
     copy(returnType = returnType.dynamicIfUnknownType(allTypes, standardTypes), arguments = arguments.map { it.dynamicIfUnknownType(allTypes, standardTypes) })
 }
 
-fun InterfaceDefinition.findExtendedAttributes(name: String) = extendedAttributes.filter { it.call == name }
-fun InterfaceDefinition?.hasExtendedAttribute(name: String) = this?.findExtendedAttributes(name)?.isNotEmpty() ?: false
-fun InterfaceDefinition.findConstructors() = findExtendedAttributes("Constructor")
+fun InterfaceDefinition.findExtendedAttribute(name: String) = extendedAttributes.firstOrNull { it.call == name }
+fun InterfaceDefinition?.hasExtendedAttribute(name: String) = this?.findExtendedAttribute(name) ?: null != null
+fun InterfaceDefinition.findConstructor() = findExtendedAttribute("Constructor")
 
 data class GenerateUnionTypes(
         val typeNamesToUnionsMap: Map<String, List<String>>,
diff --git a/libraries/tools/idl2k/src/main/kotlin/render.kt b/libraries/tools/idl2k/src/main/kotlin/render.kt
index 29d8fb4b9db..70aff29fe80 100644
--- a/libraries/tools/idl2k/src/main/kotlin/render.kt
+++ b/libraries/tools/idl2k/src/main/kotlin/render.kt
@@ -94,23 +94,20 @@ fun Appendable.render(allTypes: Map<String, GenerateTraitOrClass>, typeNamesToUn
         GenerateDefinitionKind.TRAIT -> append("interface ")
     }
 
+    append(iface.name)
+    if (iface.constructor != null && iface.constructor.arguments.isNotEmpty()) {
+        append("(")
+        renderArgumentsDeclaration(iface.constructor.arguments.map { it.dynamicIfUnknownType(allTypes.keySet()) }, false)
+        append(")")
+    }
+
     val allSuperTypes = iface.allSuperTypes(allTypes)
     val allSuperTypesNames = allSuperTypes.map { it.name }.toSet()
 
-    append(iface.name)
-    val primary = iface.primaryConstructor
-    if (primary != null) {
-        if (primary.constructor.arguments.isNotEmpty() || iface.secondaryConstructors.isNotEmpty()) {
-            append("(")
-            renderArgumentsDeclaration(primary.constructor.arguments.dynamicIfUnknownType(allTypes.keySet()), false)
-            append(")")
-        }
-    }
-
-    val superCallName = primary?.initTypeCall?.name
+    val superCalls = iface.superConstructorCalls.map { it.name }.toSet()
     val superTypesWithCalls =
-            listOf(primary?.initTypeCall).filterNotNull().map { renderCall(it) } +
-                    iface.superTypes.filter { it != superCallName && it in allSuperTypesNames } +
+            iface.superConstructorCalls.map { renderCall(it) } +
+                    iface.superTypes.filter { it !in superCalls && it in allSuperTypesNames } +
                     (typeNamesToUnions[iface.name] ?: emptyList())
 
     if (superTypesWithCalls.isNotEmpty()) {
@@ -119,20 +116,6 @@ fun Appendable.render(allTypes: Map<String, GenerateTraitOrClass>, typeNamesToUn
 
     appendln (" {")
 
-    iface.secondaryConstructors.forEach { secondary ->
-        indent(1)
-        append("constructor(")
-        renderArgumentsDeclaration(secondary.constructor.arguments.dynamicIfUnknownType(allTypes.keySet()), false)
-        append(")")
-
-        if (secondary.initTypeCall != null) {
-            append(" : ")
-            append(renderCall(secondary.initTypeCall))
-        }
-
-        appendln()
-    }
-
     val superAttributes = allSuperTypes.flatMap { it.memberAttributes }.distinct()
     val superFunctions = allSuperTypes.flatMap { it.memberFunctions }.distinct()
     val superSignatures = superAttributes.map { it.signature } merge superFunctions.map { it.signature }
diff --git a/libraries/tools/idl2k/src/main/kotlin/typeMappings.kt b/libraries/tools/idl2k/src/main/kotlin/typeMappings.kt
index 7c311af93a3..b6f14a74586 100644
--- a/libraries/tools/idl2k/src/main/kotlin/typeMappings.kt
+++ b/libraries/tools/idl2k/src/main/kotlin/typeMappings.kt
@@ -60,7 +60,7 @@ data class FunctionType(val parameterTypes : List<Attribute>, val returnType : S
 val FunctionType.arity : Int
     get() = parameterTypes.size()
 val FunctionType.text : String
-    get() = "(${parameterTypes.map { it.formatFunctionTypePart() }.join(", ")}) -> $returnType"
+    get() = "(${parameterTypes.map { it.formatFunctionTypePart() }.join(", ")}) -> ${returnType}"
 
 fun FunctionType(text : String) : FunctionType {
     val (parameters, returnType) = text.split("->".toRegex()).map { it.trim() }.filter { it != "" }
@@ -135,13 +135,12 @@ private fun mapTypedef(repository: Repository, type: String): String {
 private fun splitUnionType(unionType: String) =
         unionType.replace("Union<".toRegex(), "").replace("[>]+".toRegex(), "").split("\\s*,\\s*".toRegex()).distinct().map {it.replace("\\?$".toRegex(), "")}
 
-private fun GenerateFunction.allTypes() = sequenceOf(returnType) + arguments.asSequence().map { it.type }
+private fun GenerateFunction?.allTypes() = if (this != null) sequenceOf(returnType) + arguments.asSequence().map { it.type } else emptySequence()
 
 private fun collectUnionTypes(allTypes: Map<String, GenerateTraitOrClass>) =
         allTypes.values().asSequence()
                 .flatMap {
-                    it.secondaryConstructors.asSequence().flatMap { it.constructor.allTypes() } +
-                    sequenceOf(it.primaryConstructor).filterNotNull().flatMap { it.constructor.allTypes() } +
+                    it.constructor.allTypes() +
                             it.memberAttributes.asSequence().map { it.type } +
                             it.memberFunctions.asSequence().flatMap { it.allTypes() }
                 }