Make FileSystemFileEntry.file() chainable

Author: brolaugh

src/ngx-file-drop/dom.types.ts

@@ -43,5 +43,5 @@ export interface FileSystemDirectoryEntry extends FileSystemEntry {
 export interface FileSystemFileEntry extends FileSystemEntry {
   isDirectory: false
   isFile: true
-  file(callback: (file: File) => void): void
+  file<T>(callback: (file: File) => T): T
 }

src/ngx-file-drop/ngx-file-drop.component.ts

@@ -202,9 +202,7 @@ export class NgxFileDropComponent implements OnDestroy {
             name: (item as File).name,
             isDirectory: false,
             isFile: true,
-            file: (callback: (filea: File) => void): void => {
-              callback(item as File);
-            },
+            file: <T>(callback: (filea: File) => T) => callback(item as File),
           };
           const toUpload: NgxFileDropEntry = new NgxFileDropEntry(fakeFileEntry.name, fakeFileEntry);
           this.addToQueue(toUpload);