Add definition for ScrollTrigger events

Author: ryanhefner

types/index.d.ts

@@ -2,13 +2,18 @@
 
 import { Component, ReactNode } from 'react';
 
+export interface ScrollTriggerEventArgs {
+  progress: number;
+  velocity: number;
+}
+
 export interface ScrollTrigger extends Component {
   component?: ReactNode;
   containerRef?: HTMLElement | string;
   throttleResize?: number;
   throttleScroll?: number;
   triggerOnLoad?: boolean;
-  onEnter?: () => {};
-  onExit?: () => {};
-  onProgress?: () => {};
+  onEnter?: (args: ScrollTriggerEventArgs) => {};
+  onExit?: (args: ScrollTriggerEventArgs) => {};
+  onProgress?: (args: ScrollTriggerEventArgs) => {};
 }