Added style class definitions to *Style.d.ts

components/lib/stepper/style/StepperStyle.d.ts

@@ -1,3 +1,26 @@
+/**
+ *
+ * Stepper is a component that streamlines a wizard-like workflow, organizing content into coherent steps and visually guiding users through a numbered progression in a multi-step process.
+ *
+ * [Live Demo](https://www.primevue.org/stepper/)
+ *
+ * @module stepperstyle
+ *
+ */
 import { BaseStyle } from '../../base/style';
 
+export enum StepperClasses {
+    root = 'p-stepper',
+    list = 'p-stepper-list',
+    stepperItem = 'p-stepper-item',
+    stepperItemHeader = 'p-stepper-item-header',
+    stepperItemNumber = 'p-stepper-item-number',
+    stepperItemTitle = 'p-stepper-item-title',
+    stepperSeparator = 'p-stepper-separator',
+    stepperPanelContentContainer = 'p-stepper-panel-content-container',
+    stepperPanelContent = 'p-stepper-panel-content',
+    panels = 'p-stepper-panels',
+    panel = 'p-stepper-panel'
+}
+
 export interface StepperStyle extends BaseStyle {}