fix: specify type in uploadBase64

fix #178

__tests__/uploadBase64.js

@@ -0,0 +1,50 @@
+const imgur = require('../lib/imgur.js');
+
+describe('uploadBase64()', () => {
+  describe('validation', () => {
+    test('should fail with input', () => {
+      const errMsg = 'Invalid Base64 input';
+
+      expect(imgur.uploadBase64()).rejects.toThrowError(errMsg);
+    });
+  });
+
+  describe("delegates to _imgurRequest('upload', ...)", () => {
+    const mockResult = { foo: 'bar' };
+    const testImage =
+      'iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNkYPhfDwAChwGA60e6kgAAAABJRU5ErkJggg==';
+
+    const _imgurRequestBackup = imgur._imgurRequest;
+
+    beforeEach(() => {
+      imgur._imgurRequest = jest
+        .fn()
+        .mockImplementation(() => Promise.resolve(mockResult));
+    });
+
+    afterEach(() => {
+      imgur._imgurRequest.mockClear();
+      imgur._imgurRequest = _imgurRequestBackup;
+    });
+
+    test('should delegate', () => {
+      const promise = imgur.uploadBase64(testImage);
+
+      expect(imgur._imgurRequest).toHaveBeenCalledWith('upload', testImage, {
+        type: 'base64',
+      });
+      expect(promise).resolves.toEqual(mockResult);
+    });
+
+    test('should propagate albumId', () => {
+      const albumId = '123';
+      const promise = imgur.uploadBase64(testImage, albumId);
+
+      expect(imgur._imgurRequest).toHaveBeenCalledWith('upload', testImage, {
+        album: albumId,
+        type: 'base64',
+      });
+      expect(promise).resolves.toEqual(mockResult);
+    });
+  });
+});

lib/imgur.js

@@ -579,7 +579,7 @@ imgur.uploadUrl = async (url, albumId, title, description) => {
  * @returns {promise} - on resolve, returns the resulting image object from imgur
  */
 imgur.uploadBase64 = async (base64, albumId, title, description) => {
-  const extraFormParams = {};
+  const extraFormParams = { type: 'base64' };
 
   if (typeof albumId === 'string' && albumId.length) {
     extraFormParams.album = albumId;