Add typescript definition

Author: Quan Tran

index.d.ts

@@ -0,0 +1,16 @@
+import { Component, ReactNode } from "react";
+
+declare module "react-native-easy-toast" {
+  export interface DURATION {
+    LENGTH_SHORT: number;
+    FOREVER: number;
+  }
+  export default class Toast extends Component {
+    show: (
+      text: string | ReactNode,
+      duration?: number,
+      callback?: (() => void)
+    ) => void;
+    close: (duration?: number) => void;
+  }
+}

package.json

@@ -3,6 +3,7 @@
   "version": "1.1.0",
   "description": "A react native module to show toast like android, it works on iOS and Android.",
   "main": "index.js",
+  "types": "index.d.ts",
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1"
   },
@@ -28,8 +29,8 @@
     "url": "https://github.com/crazycodeboy/react-native-easy-toast/issues"
   },
   "dependencies": {
-		"prop-types": "^15.6.0"
-	},
+    "prop-types": "^15.6.0"
+  },
   "peerDependencies": {
     "react-native": ">=0.20.0",
     "prop-types": "^15.5.7"