From 3fe2a3fdc9a47b7c13eacee1cfd7595d68c71bf9 Mon Sep 17 00:00:00 2001
From: Kir_Antipov <kp.antipov@gmail.com>
Date: Mon, 9 Jan 2023 15:21:43 +0000
Subject: [PATCH] Made a helper method to check if an object is an error

---
 src/utils/errors/error.ts                | 10 ++++++++++
 tests/unit/utils/errors.ts/error.spec.ts | 11 +++++++++++
 2 files changed, 21 insertions(+)
 create mode 100644 src/utils/errors/error.ts
 create mode 100644 tests/unit/utils/errors.ts/error.spec.ts

diff --git a/src/utils/errors/error.ts b/src/utils/errors/error.ts
new file mode 100644
index 0000000..515dc5a
--- /dev/null
+++ b/src/utils/errors/error.ts
@@ -0,0 +1,10 @@
+/**
+ * Determines if the input is an {@link Error}.
+ *
+ * @param error - Input to be checked.
+ *
+ * @returns `true` if the input is an `Error`; otherwise, `false`.
+ */
+export function isError(error: unknown): error is Error {
+    return error instanceof Error;
+}
diff --git a/tests/unit/utils/errors.ts/error.spec.ts b/tests/unit/utils/errors.ts/error.spec.ts
new file mode 100644
index 0000000..46ed6e2
--- /dev/null
+++ b/tests/unit/utils/errors.ts/error.spec.ts
@@ -0,0 +1,11 @@
+import { isError } from "@/utils/errors/error";
+
+describe("isError", () => {
+    test("returns true if the input is an instance of Error", () => {
+        expect(isError(new Error("test error"))).toBe(true);
+    });
+
+    test("returns false if the input is not an instance of Error", () => {
+        expect(isError("not an error")).toBe(false);
+    });
+});