fix typescript type definition

Author: Darmody

index.d.ts

@@ -1,16 +1,29 @@
 import { Component, ReactNode } from "react";
 
+interface ToastComponentProps {
+  position?: "bottom" | "center" | "top";
+  textStyle?: {};
+  positionValue?: number;
+  fadeInDuration?: number;
+  fadeOutDuration?: number;
+  opacity?: number;
+}
+
 declare module "react-native-easy-toast" {
-  export interface DURATION {
+  interface IDuration {
     LENGTH_SHORT: number;
     FOREVER: number;
   }
-  export default class Toast extends Component {
+
+  export var DURATION: IDuration;
+
+  export default class Toast extends Component<ToastComponentProps> {
     show: (
       text: string | ReactNode,
       duration?: number,
-      callback?: (() => void)
+      callback?: () => void
     ) => void;
     close: (duration?: number) => void;
   }
 }
+