From 5d34745abfbe7e90d56f7e10fa0ec997b90878ed Mon Sep 17 00:00:00 2001
From: Dmitry Boldyrev <ribkatt@gmail.com>
Date: Fri, 15 Dec 2023 00:47:29 +0600
Subject: [PATCH] Add type tests

---
 test-typings/previous-value.ts | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)
 create mode 100644 test-typings/previous-value.ts

diff --git a/test-typings/previous-value.ts b/test-typings/previous-value.ts
new file mode 100644
index 00000000..987a75d3
--- /dev/null
+++ b/test-typings/previous-value.ts
@@ -0,0 +1,34 @@
+import { expectType } from 'tsd';
+import { Store, createStore, createEvent } from 'effector';
+import { previousValue } from '../dist/previous-value';
+
+{
+  const $foo = createStore('a');
+  const $fooPrev = previousValue($foo);
+
+  expectType<Store<string | null>>($fooPrev);
+}
+{
+  const $foo = createStore('a');
+  const $fooPrev = previousValue($foo, 'b');
+
+  expectType<Store<string>>($fooPrev);
+}
+{
+  const $foo = createStore('a');
+  const $fooPrev = previousValue($foo, 0);
+
+  expectType<Store<string | number>>($fooPrev);
+}
+{
+  const $foo = createStore('a');
+  const $fooPrev = previousValue($foo, undefined);
+
+  expectType<Store<string | void>>($fooPrev);
+}
+{
+  const foo = createEvent();
+
+  // @ts-expect-error
+  previousValue(foo, 0);
+}