From 03ba59c3ac75c4708569fd6cca290eb45a61a4a5 Mon Sep 17 00:00:00 2001
From: Ray Zane <raymondzane@gmail.com>
Date: Wed, 19 Aug 2020 13:50:51 -0400
Subject: [PATCH] Avoid double submission

---
 src/useSubmit.ts       | 4 ++++
 test/useSubmit.test.ts | 8 ++++++++
 2 files changed, 12 insertions(+)

diff --git a/src/useSubmit.ts b/src/useSubmit.ts
index 9b5c913..271d9fe 100644
--- a/src/useSubmit.ts
+++ b/src/useSubmit.ts
@@ -29,6 +29,10 @@ export function useSubmit<Value, Result>(
       event.stopPropagation();
     }
 
+    if (form.isSubmitting) {
+      return;
+    }
+
     form.setSubmitting(true);
 
     try {
diff --git a/test/useSubmit.test.ts b/test/useSubmit.test.ts
index 119ee0a..b7570c6 100644
--- a/test/useSubmit.test.ts
+++ b/test/useSubmit.test.ts
@@ -81,3 +81,11 @@ test("prevents default and stops propagation", async () => {
   expect(event.preventDefault).toHaveBeenCalled();
   expect(event.stopPropagation).toHaveBeenCalled();
 });
+
+test("makes no attempt to submit when already submitting", async () => {
+  const form: any = { isSubmitting: true };
+  const submit = jest.fn();
+  const onSubmit = renderHook(() => useSubmit(form, submit));
+  await onSubmit.result.current();
+  expect(submit).not.toHaveBeenCalled();
+});