Stricter typings for the onSuccess and onError calls

types/easymde-test.ts

@@ -92,8 +92,10 @@ const editorImagesCustom = new EasyMDE({
     imageAccept: 'image/png, image/bmp',
     imageCSRFToken: undefined,
     imageMaxSize: 10485760,
-    imageUploadFunction: (file: File, onSuccess: Function, onError: Function) => {
+    imageUploadFunction: (file: File, onSuccess, onError) => {
-        console.log(file)
+        console.log(file);
+        onSuccess('http://image.url/9.png');
+        onError('Failed because reasons.');
     },
     imageTexts: {
         sbInit: 'Drag & drop images!',

types/easymde.d.ts

@@ -134,7 +134,7 @@ declare namespace EasyMDE {
         uploadImage?: boolean;
         imageMaxSize?: number;
         imageAccept?: string;
-        imageUploadFunction?: (file: File, onSuccess: Function, onError: Function) => void;
+        imageUploadFunction?: (file: File, onSuccess: (url: string) => void, onError: (error: string) => void) => void;
         imageUploadEndpoint?: string;
         imageCSRFToken?: string;
         imageTexts?: ImageTextsOptions;