BREAKING CHANGE: refactor(subscriber): remove unneeded code & utilize…

… typescript (#388)

BREAKING CHANGE: refactor(subscriber): remove unneeded code & utilize typescript

package.json

@@ -56,12 +56,13 @@
     "google-auth-library": "^2.0.0",
     "google-gax": "^0.22.0",
     "is": "^3.0.1",
+    "is-stream-ended": "^0.1.4",
     "lodash.chunk": "^4.2.0",
     "lodash.merge": "^4.6.0",
     "lodash.snakecase": "^4.1.1",
+    "p-defer": "^1.0.0",
     "protobufjs": "^6.8.1",
-    "through2": "^3.0.0",
-    "uuid": "^3.1.0"
+    "through2": "^3.0.0"
   },
   "devDependencies": {
     "@google-cloud/nodejs-repo-tools": "^3.0.0",
@@ -70,6 +71,7 @@
     "@types/extend": "^3.0.0",
     "@types/is": "0.0.21",
     "@types/mocha": "^5.2.5",
+    "@types/p-defer": "^1.0.3",
     "@types/proxyquire": "^1.3.28",
     "@types/sinon": "^7.0.0",
     "@types/through2": "^2.0.34",
@@ -90,6 +92,7 @@
     "proxyquire": "^2.0.0",
     "sinon": "^7.1.1",
     "source-map-support": "^0.5.9",
-    "typescript": "~3.2.0"
+    "typescript": "~3.2.0",
+    "uuid": "^3.1.0"
   }
 }