diff --git a/platform/editor-ui-api/src/com/intellij/ide/structureView/StructureViewBuilder.java b/platform/editor-ui-api/src/com/intellij/ide/structureView/StructureViewBuilder.java
deleted file mode 100644
index 15351df5cf7f..000000000000
--- a/platform/editor-ui-api/src/com/intellij/ide/structureView/StructureViewBuilder.java
+++ /dev/null
@@ -1,52 +0,0 @@
-// Copyright 2000-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
-package com.intellij.ide.structureView;
-
-import com.intellij.openapi.extensions.ExtensionPointName;
-import com.intellij.openapi.extensions.KeyedFactoryEPBean;
-import com.intellij.openapi.fileEditor.FileEditor;
-import com.intellij.openapi.fileTypes.FileTypeExtensionFactory;
-import com.intellij.openapi.project.Project;
-import org.jetbrains.annotations.ApiStatus;
-import org.jetbrains.annotations.NotNull;
-import org.jetbrains.annotations.Nullable;
-
-/**
- * Defines the implementation of Structure View and the file structure popup for
- * a file type. This class allows to replace the entire Structure View component
- * implementation. If it is acceptable to have the standard component implementation
- * and to customize only how the Structure View is populated with the file data,
- * the standard implementation of this interface - {@link TreeBasedStructureViewBuilder} -
- * should be used.
- *
- * @see com.intellij.lang.LanguageStructureViewBuilder#getStructureViewBuilder(com.intellij.psi.PsiFile)
- * @see com.intellij.lang.PsiStructureViewFactory#getStructureViewBuilder(com.intellij.psi.PsiFile)}
- */
-
-public interface StructureViewBuilder {
-
-  static @NotNull StructureViewBuilderProvider getProvider() {
-    return PROVIDER;
-  }
-
-  /**
-   * Returns the structure view implementation for the specified file
-   *
-   * @param fileEditor the editor for which the structure view is requested. Can be null if file is not open (e.g. structure is requested
-   *                   from the project view)
-   * @param project    the project containing the file for which the structure view is requested.
-   * @return the structure view implementation.
-   * @see TreeBasedStructureViewBuilder
-   */
-  @NotNull
-  StructureView createStructureView(@Nullable FileEditor fileEditor, @NotNull Project project);
-
-  @ApiStatus.Internal
-  ExtensionPointName<KeyedFactoryEPBean> EP_NAME = ExtensionPointName.create("com.intellij.structureViewBuilder");
-
-  /**
-   * @deprecated use {@link #getProvider()} instead
-   */
-  @Deprecated
-  StructureViewBuilderProvider PROVIDER =
-    new FileTypeExtensionFactory<>(StructureViewBuilderProvider.class, EP_NAME).get();
-}
diff --git a/platform/editor-ui-api/src/com/intellij/ide/structureView/StructureViewBuilder.kt b/platform/editor-ui-api/src/com/intellij/ide/structureView/StructureViewBuilder.kt
new file mode 100644
index 000000000000..e53a6ff91f9e
--- /dev/null
+++ b/platform/editor-ui-api/src/com/intellij/ide/structureView/StructureViewBuilder.kt
@@ -0,0 +1,49 @@
+// Copyright 2000-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+package com.intellij.ide.structureView
+
+import com.intellij.openapi.extensions.ExtensionPointName
+import com.intellij.openapi.extensions.ExtensionPointName.Companion.create
+import com.intellij.openapi.extensions.KeyedFactoryEPBean
+import com.intellij.openapi.fileEditor.FileEditor
+import com.intellij.openapi.fileTypes.FileTypeExtensionFactory
+import com.intellij.openapi.project.Project
+import org.jetbrains.annotations.ApiStatus
+
+/**
+ * Defines the implementation of Structure View and the file structure popup for
+ * a file type. This class allows to replace the entire Structure View component
+ * implementation. If it is acceptable to have the standard component implementation
+ * and to customize only how the Structure View is populated with the file data,
+ * the standard implementation of this interface - [TreeBasedStructureViewBuilder] -
+ * should be used.
+ *
+ * @see com.intellij.lang.LanguageStructureViewBuilder.getStructureViewBuilder
+ * @see com.intellij.lang.PsiStructureViewFactory.getStructureViewBuilder
+ */
+interface StructureViewBuilder {
+  /**
+   * Returns the structure view implementation for the specified file
+   *
+   * @param fileEditor the editor for which the structure view is requested. Can be null if file is not open (e.g. structure is requested
+   * from the project view)
+   * @param project    the project containing the file for which the structure view is requested.
+   * @return the structure view implementation.
+   * @see TreeBasedStructureViewBuilder
+   */
+  fun createStructureView(fileEditor: FileEditor?, project: Project): StructureView
+
+  @ApiStatus.Internal
+  companion object {
+    @ApiStatus.Internal
+    @JvmField
+    val EP_NAME: ExtensionPointName<KeyedFactoryEPBean> = create<KeyedFactoryEPBean>("com.intellij.structureViewBuilder")
+
+    @JvmStatic
+    fun getProvider(): StructureViewBuilderProvider = PROVIDER
+
+    @Deprecated(replaceWith = ReplaceWith("getProvider()"), message = "Use getProvider()")
+    @JvmField
+    val PROVIDER: StructureViewBuilderProvider = FileTypeExtensionFactory<StructureViewBuilderProvider>(
+      StructureViewBuilderProvider::class.java, EP_NAME).get()
+  }
+}