Made a helper method to check if an object is an error

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;
+}

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);
+    });
+});