chore: onStart always in sync

Author: zombieJ

.prettierrc

@@ -2,5 +2,6 @@
   "singleQuote": true,
   "trailingComma": "all",
   "proseWrap": "never",
-  "printWidth": 100
+  "printWidth": 100,
+  "arrowParens": "avoid"
 }

src/AjaxUploader.tsx

@@ -135,6 +135,8 @@ class AjaxUploader extends Component<UploadProps> {
     const { props } = this;
     const { onStart, onProgress, transformFile = originFile => originFile } = props;
 
+    onStart(file);
+
     new Promise(resolve => {
       let { action } = props;
       if (typeof action === 'function') {
@@ -180,7 +182,6 @@ class AjaxUploader extends Component<UploadProps> {
           },
         };
 
-        onStart(file);
         this.reqs[uid] = request(requestOption);
       });
     });