added express packer

ts/export/packer/express.ts

@@ -0,0 +1,21 @@
+import {Packer} from "./packer";
+import * as fs from "fs";
+import * as express from "express";
+
+export class ExpressPacker extends Packer {
+    private res: express.Response;
+
+    constructor(res: express.Response) {
+        super();
+        this.res = res;
+
+        this.res.on('close', () => {
+            return res.status(200).send('OK').end();
+        });
+    }
+
+    pack() {
+        this.res.attachment(name + ".docx");
+        super.pack(this.res);
+    }
+}