Added style class definitions to *Style.d.ts

components/lib/inputnumber/style/InputNumberStyle.d.ts

@@ -1,3 +1,20 @@
+/**
+ *
+ * InputNumber is an input component to provide numerical input.
+ *
+ * [Live Demo](https://www.primevue.org/inputnumber/)
+ *
+ * @module inputnumberstyle
+ *
+ */
 import { BaseStyle } from '../../base/style';
 
+export enum InputNumberClasses {
+    root = 'p-inputnumber',
+    pcInput = 'p-inputnumber-input',
+    buttonGroup = 'p-inputnumber-button-group',
+    incrementButton = 'p-inputnumber-increment-button',
+    decrementButton = 'p-inputnumber-decrement-button'
+}
+
 export interface InputNumberStyle extends BaseStyle {}