Correct type definition for onSuccess callback (#717)

Fixes #716

Author: Marius

lib/index.d.ts

@@ -32,7 +32,7 @@ interface UploadOptions {
 
   onProgress?: ((bytesSent: number, bytesTotal: number) => void) | null
   onChunkComplete?: ((chunkSize: number, bytesAccepted: number, bytesTotal: number) => void) | null
-  onSuccess?: (() => void) | null
+  onSuccess?: ((payload: OnSuccessPayload) => void) | null
   onError?: ((error: Error | DetailedError) => void) | null
   onShouldRetry?:
     | ((error: DetailedError, retryAttempt: number, options: UploadOptions) => boolean)
@@ -59,6 +59,10 @@ interface UploadOptions {
   httpStack?: HttpStack
 }
 
+interface OnSuccessPayload {
+  lastResponse: HttpResponse
+}
+
 interface UrlStorage {
   findAllUploads(): Promise<PreviousUpload[]>
   findUploadsByFingerprint(fingerprint: string): Promise<PreviousUpload[]>

lib/index.test-d.ts

@@ -27,8 +27,9 @@ const upload = new tus.Upload(file, {
     console.log(bytesSent, bytesTotal, `${percentage}%`)
   },
   onChunkComplete: (_chunkSize: number, _bytesAccepted: number) => {},
-  onSuccess: () => {
+  onSuccess: (payload: tus.OnSuccessPayload) => {
     console.log('Download from %s complete', upload.url)
+    console.log('Response header', payload.lastResponse.getHeader('X-Info'))
   },
   onError: (error: Error | DetailedError) => {
     console.error(`Failed because: ${error}`)