added types for app-root-path

package.json

@@ -27,6 +27,7 @@
     "clippy"
   ],
   "dependencies": {
+    "@types/app-root-path": "^1.2.4",
     "@types/archiver": "^0.15.37",
     "@types/express": "^4.0.35",
     "@types/lodash": "^4.14.54",

ts/export/packer/packer.ts

@@ -1,3 +1,4 @@
+import * as appRoot from "app-root-path";
 import * as archiver from "archiver";
 import * as fs from "fs";
 import * as xml from "xml";
@@ -8,8 +9,6 @@ import { Styles } from "../../styles";
 import { DefaultStylesFactory } from "../../styles/factory";
 import { Formatter } from "../formatter";
 
-const appRoot = require("app-root-path");
-
 export abstract class Packer {
     protected archive: any;
     protected document: Document;