From 14b8708a95d1d166b32f60cb6c8bc1b6ce546a79 Mon Sep 17 00:00:00 2001
From: Shu Ding <g@shud.in>
Date: Wed, 10 Mar 2021 23:31:52 +0800
Subject: [PATCH] allow passing undefined config (#1022)

---
 src/use-swr-infinite.ts | 7 +++++--
 src/use-swr.ts          | 8 ++++++--
 2 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/src/use-swr-infinite.ts b/src/use-swr-infinite.ts
index 0d6e6ed51..999a7a767 100644
--- a/src/use-swr-infinite.ts
+++ b/src/use-swr-infinite.ts
@@ -22,11 +22,14 @@ function useSWRInfinite<Data = any, Error = any>(
   ...args:
     | readonly [KeyLoader<Data>]
     | readonly [KeyLoader<Data>, Fetcher<Data>]
-    | readonly [KeyLoader<Data>, SWRInfiniteConfiguration<Data, Error>]
+    | readonly [
+        KeyLoader<Data>,
+        SWRInfiniteConfiguration<Data, Error> | undefined
+      ]
     | readonly [
         KeyLoader<Data>,
         Fetcher<Data>,
-        SWRInfiniteConfiguration<Data, Error>
+        SWRInfiniteConfiguration<Data, Error> | undefined
       ]
 ): SWRInfiniteResponse<Data, Error> {
   const getKey = args[0]
diff --git a/src/use-swr.ts b/src/use-swr.ts
index 794e96285..4458f5f1b 100644
--- a/src/use-swr.ts
+++ b/src/use-swr.ts
@@ -210,8 +210,12 @@ function useSWR<Data = any, Error = any>(
   ...args:
     | readonly [Key]
     | readonly [Key, Fetcher<Data> | null]
-    | readonly [Key, SWRConfiguration<Data, Error>]
-    | readonly [Key, Fetcher<Data> | null, SWRConfiguration<Data, Error>]
+    | readonly [Key, SWRConfiguration<Data, Error> | undefined]
+    | readonly [
+        Key,
+        Fetcher<Data> | null,
+        SWRConfiguration<Data, Error> | undefined
+      ]
 ): SWRResponse<Data, Error> {
   const _key = args[0]
   const config = Object.assign(