minor fix for getFile

- add the fileExtensions when a filename was submitted without
 a file extensions
bump version to 4.4.0

package.json

@@ -24,22 +24,22 @@
     "mongo",
     "async"
   ],
-  "version": "4.3.0",
+  "version": "4.4.0",
   "devDependencies": {
-    "@types/chai": "^4.1.5",
+    "@types/chai": "^4.1.7",
     "@types/mocha": "^5.2.5",
-    "@types/mongodb": "^3.1.7",
-    "@types/node": "^10.10.1",
-    "chai": "^4.1.2",
+    "@types/mongodb": "^3.1.18",
+    "@types/node": "^10.12.18",
+    "chai": "^4.2.0",
     "jsdoc": "^3.5.5",
     "mocha": "^5.2.0",
     "ts-node": "^7.0.1",
-    "tsd-jsdoc": "^2.0.0-beta.6",
-    "tslint": "^5.11.0",
-    "typescript": "^3.0.3"
+    "tsd-jsdoc": "^2.1.1",
+    "tslint": "^5.12.0",
+    "typescript": "^3.2.2"
   },
   "dependencies": {
     "es6-promise": "^4.2.5",
-    "mongodb": "^3.1.6"
+    "mongodb": "^3.1.10"
   }
 }

src/GridFSPromise.ts

@@ -1,6 +1,7 @@
 import {ObjectID} from "bson";
 import * as fs from "fs";
 import {GridFSBucket, GridFSBucketReadStream, MongoClient, MongoClientOptions} from "mongodb";
+import * as path from "path";
 
 export interface IGridFSObject {
     _id: ObjectID;
@@ -124,6 +125,10 @@ export class GridFSPromise {
 
                     if (!fileName) {
                         fileName = result[0].filename;
+                    } else {
+                        if (path.extname(fileName) === "") {
+                            fileName = fileName.concat(path.extname(result[0].filename));
+                        }
                     }
 
                     if (!filePath) {