several improvements

package.json

@@ -95,6 +95,7 @@
     "moment": "^2.29.1",
     "ng2-pdf-viewer": "^7.0.1",
     "ngx-socket-io": "^3.2.0",
+    "pdfjs": "^2.4.6",
     "puppeteer": "^10.1.0",
     "rxjs": "~6.6.3",
     "rxjs-compat": "^6.6.7",
@@ -192,4 +193,4 @@
     "url": "git+https://Kayaya@bitbucket.org/equilibriumito/gabinete-digital.git"
   },
   "license": "ISC"
-}
+}