fix: do not emit progress on metadata send

src/uploadx/lib/uploader.spec.ts

@@ -156,6 +156,26 @@ describe('Uploader', () => {
     });
   });
 
+  describe('request', () => {
+    serverStatus = 200;
+
+    it('should report progress if content is uploading', async () => {
+      uploader = new MockUploader(file, {});
+      uploader.offset = 0;
+      const request = spyOn<any>(uploader.ajax, 'request').and.callThrough();
+      await uploader.request({ method: 'POST', body: new FormData() });
+      expect((request.calls.mostRecent().args[0] as any).onUploadProgress).toBeTruthy();
+    });
+
+    it('should not report progress if offset is undefined', async () => {
+      uploader = new MockUploader(file, {});
+      uploader.offset = undefined;
+      const request = spyOn<any>(uploader.ajax, 'request').and.callThrough();
+      await uploader.request({ method: 'POST', body: new FormData() });
+      expect((request.calls.mostRecent().args[0] as any).onUploadProgress).toBeUndefined();
+    });
+  });
+
   describe('prerequest', () => {
     const common = { common: 'true' };
     const auth = { auth: 'token' };

src/uploadx/lib/uploader.ts

@@ -199,7 +199,8 @@ export abstract class Uploader implements UploadState {
       validateStatus: () => true,
       timeout: this.retry.config.timeout
     };
-    if (body && typeof body !== 'string') {
+    //todo: more reliable detection
+    if (isNumber(this.offset) && body && typeof body === 'object') {
       ajaxRequestConfig.onUploadProgress = this.onProgress();
     }
     const response = await this.ajax.request(ajaxRequestConfig);
@@ -277,7 +278,7 @@ export abstract class Uploader implements UploadState {
       DynamicChunk.scale(this.speed);
       if (!throttle) {
         throttle = setTimeout(() => (throttle = undefined), 500);
-        const uploaded = (this.offset as number) + loaded;
+        const uploaded = (this.offset || 0) + loaded;
         this.progress = +((uploaded / this.size) * 100).toFixed(2);
         this.remaining = ~~((this.size - uploaded) / this.speed);
         this.stateChange(this);