diff --git a/packages/core/css/css-tree-parser.d.ts b/packages/core/css/css-tree-parser.d.ts
deleted file mode 100644
index 263200320..000000000
--- a/packages/core/css/css-tree-parser.d.ts
+++ /dev/null
@@ -1 +0,0 @@
-export declare function cssTreeParse(css: any, source: any): any;
diff --git a/packages/core/css/system-classes.d.ts b/packages/core/css/system-classes.d.ts
deleted file mode 100644
index 62154ca51..000000000
--- a/packages/core/css/system-classes.d.ts
+++ /dev/null
@@ -1,66 +0,0 @@
-/**
- * Various framework wide css utilities
- */
-export namespace CSSUtils {
-	/**
-	 * String value "ns-" used for CSS system class prefix.
-	 */
-	export const CLASS_PREFIX: string;
-
-	/**
-	 * Gets CSS system class for modal root view.
-	 */
-	export const MODAL_ROOT_VIEW_CSS_CLASS;
-
-	/**
-	 * Gets CSS system classes for root view.
-	 */
-	export const ROOT_VIEW_CSS_CLASS;
-
-	/**
-	 * Gets a list of the current system classes.
-	 * Intended for internal use only
-	 */
-	export function getSystemCssClasses(): string[];
-
-	/**
-	 * Pushes to the list of the current system classes.
-	 * Intended for internal use only
-	 */
-	export function pushToSystemCssClasses(value: string): number;
-
-	/**
-	 * Removes value from the list of current system classes
-	 * Intended for internal use only
-	 * @param value
-	 */
-	export function removeSystemCssClass(value: string): string;
-
-	/**
-	 * Same as MODAL_ROOT_VIEW_CSS_CLASS
-	 */
-	export function getModalRootViewCssClass(): string;
-
-	/**
-	 * Gets CSS system classes for root view. Same as ROOT_VIEW_CSS_CLASS + _getCssClasses
-	 * Intended for internal use only
-	 * @deprecated Use ROOT_VIEW_CSS_CLASS or getCssClasses() instead
-	 */
-	export function getRootViewCssClasses(): string[];
-
-	/**
-	 * Appends new CSS class to the system classes and returns the new length of the array.
-	 * Intended for internal use only
-	 * @deprecated Use pushToCssClasses() instead
-	 * @param value New CSS system class.
-	 */
-	export function pushToRootViewCssClasses(value: string): number;
-
-	/**
-	 * Removes CSS class from the system classes and returns it.
-	 * Intended for internal use only
-	 * @deprecated Use removeCssClass() instead
-	 * @param value
-	 */
-	export function removeFromRootViewCssClasses(value: string): string;
-}