Expose addFiles method (23#412)

- Expose `addFiles` method that takes an array of File objects.

README.md

@@ -139,6 +139,7 @@ adding the file. (Default: `null`)
 * `.progress()` Returns a float between 0 and 1 indicating the current upload progress of all files.
 * `.isUploading()` Returns a boolean indicating whether or not the instance is currently uploading anything.
 * `.addFile(file)` Add a HTML5 File object to the list of files.
+* `.addFiles(files)` Add an Array of HTML5 File objects to the list of files.
 * `.removeFile(file)` Cancel upload of a specific `ResumableFile` object on the list from the list.
 * `.getFromUniqueIdentifier(uniqueIdentifier)` Look up a `ResumableFile` object by its unique identifier.
 * `.getSize()` Returns the total size of the upload in bytes.

resumable-tests.ts

@@ -4,6 +4,7 @@ let resumable: Resumable = new Resumable({chunkSize: 123});
 let resumableNoOpts: Resumable = new Resumable();
 
 resumable.addFile(new File([], 'test.tmp'), {});
+resumable.addFiles([new File([], 'test.tmp')], {});
 resumable.assignBrowse(document, true);
 resumable.assignBrowse([document], true);
 resumable.assignDrop(document);

resumable.d.ts

@@ -208,6 +208,10 @@ declare module Resumable  {
      * Add a HTML5 File object to the list of files.
      **/
     addFile(file: File): void;
+    /**
+     * Add an Array of HTML5 File objects to the list of files.
+     **/
+    addFiles(files: Array<File>): void;
     /**
      * Cancel upload of a specific ResumableFile object on the list from the list.
      **/

resumable.js

@@ -1029,6 +1029,9 @@
     $.addFile = function(file, event){
       appendFilesFromFileList([file], event);
     };
+    $.addFiles = function(files, event){
+      appendFilesFromFileList(files, event);
+    };
     $.removeFile = function(file){
       for(var i = $.files.length - 1; i >= 0; i--) {
         if($.files[i] === file) {