diff --git a/js/core/index.d.ts b/js/core/index.d.ts
index 0acff4bfd5b1..e50c632082a5 100644
--- a/js/core/index.d.ts
+++ b/js/core/index.d.ts
@@ -19,9 +19,10 @@ export type Xor<T1, T2 = never, T3 = never, T4 = never, T5 = never, T6 = never,
   | Seal<T8, KeysOf<T1, T2, T3, T4, T5, T6, T7, T9>>
   | Seal<T9, KeysOf<T1, T2, T3, T4, T5, T6, T7, T8>>;
 
-export type DeepPartial<T> = T extends object ? {
+export type Scalar = undefined | null | string | String | number | Number | BigInteger | boolean | Boolean | Date | Function | Symbol | Array<unknown>;
+export type DeepPartial<T> = T extends Scalar ? T : {
   [P in keyof T]?: DeepPartial<T[P]>;
-} : T;
+};
 
 // Omit does not exist in TS < 3.5.1
 export type Skip<T, K extends keyof T> = Pick<T, Exclude<keyof T, K>>;
diff --git a/ts/dx.all.d.ts b/ts/dx.all.d.ts
index f34ab2b915c9..8c3e3447ed99 100644
--- a/ts/dx.all.d.ts
+++ b/ts/dx.all.d.ts
@@ -1909,11 +1909,11 @@ declare module DevExpress.core {
   /**
    * @deprecated Attention! This type is for internal purposes only. If you used it previously, please submit a ticket to our {@link https://supportcenter.devexpress.com/ticket/create Support Center}. We will check if there is an alternative solution.
    */
-  export type DeepPartial<T> = T extends object
-    ? {
+  export type DeepPartial<T> = T extends Scalar
+    ? T
+    : {
         [P in keyof T]?: DeepPartial<T[P]>;
-      }
-    : T;
+      };
   export type DefaultOptionsRule<T> = {
     device?: Device | Device[] | ((device: Device) => boolean);
     options: DeepPartial<T>;
@@ -1989,6 +1989,23 @@ declare module DevExpress.core {
    * @deprecated Attention! This type is for internal purposes only. If you used it previously, please submit a ticket to our {@link https://supportcenter.devexpress.com/ticket/create Support Center}. We will check if there is an alternative solution.
    */
   interface PromiseType<T> extends JQueryPromise<T> {}
+  /**
+   * @deprecated Attention! This type is for internal purposes only. If you used it previously, please submit a ticket to our {@link https://supportcenter.devexpress.com/ticket/create Support Center}. We will check if there is an alternative solution.
+   */
+  export type Scalar =
+    | undefined
+    | null
+    | string
+    | String
+    | number
+    | Number
+    | BigInteger
+    | boolean
+    | Boolean
+    | Date
+    | Function
+    | Symbol
+    | Array<unknown>;
 
   /**
    * @deprecated Attention! This type is for internal purposes only. If you used it previously, please submit a ticket to our {@link https://supportcenter.devexpress.com/ticket/create Support Center}. We will check if there is an alternative solution.