1 files changed, 26 insertions, 0 deletions
diff --git a/packages/taler-util/src/operation.ts b/packages/taler-util/src/operation.ts
index 213bfeecd..a554e1f31 100644
--- a/packages/taler-util/src/operation.ts
+++ b/packages/taler-util/src/operation.ts
@@ -147,6 +147,32 @@ export function opUnknownFailure(resp: HttpResponse, text: string): never {
   );
 }
 
+/**
+ * Convenience function to throw an error if the operation is not a success.
+ */
+export function narrowOpSuccessOrThrow<Body, ErrorEnum>(
+  opRes: OperationResult<Body, ErrorEnum>,
+): asserts opRes is OperationOk<Body> {
+  const httpResponse = opRes.httpResp;
+  if (opRes.type !== "ok") {
+    throw TalerError.fromDetail(
+      TalerErrorCode.WALLET_UNEXPECTED_REQUEST_ERROR,
+      {
+        requestUrl: httpResponse.requestUrl,
+        requestMethod: httpResponse.requestMethod,
+        httpStatusCode: httpResponse.status,
+        errorResponse:
+          "detail" in opRes
+            ? opRes.detail
+            : "body" in opRes
+              ? opRes.body
+              : undefined,
+      },
+      `Unexpected HTTP status ${httpResponse.status} in response`,
+    );
+  }
+}
+
 export type ResultByMethod<
   TT extends object,
   p extends keyof TT,