Fix primefaces#4129: MutliSelect typescript filter update

components/lib/multiselect/multiselect.d.ts

@@ -169,6 +169,32 @@ interface MultiSelectFilterOptions {
     reset?: () => void;
 }
 
+/**
+ * Custom filter template options.
+ */
+interface MultiSelectTemplateOptions {
+    /**
+     * Style class of the filter.
+     */
+    className: string;
+    /**
+     * The filter element.
+     */
+    element: HTMLDivElement;
+    /**
+     * Style class of the filter icon.
+     */
+    filterIconClassName: string;
+    /**
+     * The filter input options.
+     */
+    filterOptions?: MultiSelectFilterOptions;
+    /**
+     * The props of multiselect header.
+     */
+    props?: any;
+}
+
 /**
  * Defines valid properties in MultiSelect component. In addition to these, all properties of HTMLDivElement can be used in this component.
  * @group Properties