From cfbe9c05a5b3de542f195d4fbe7baeec3092d120 Mon Sep 17 00:00:00 2001
From: segayuu <segayuu@gmail.com>
Date: Tue, 22 May 2018 18:47:07 +0900
Subject: [PATCH] When err is undefined, fail is not executed

---
 types/iferr/iferr-tests.ts | 2 +-
 types/iferr/index.d.ts     | 6 +++---
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/types/iferr/iferr-tests.ts b/types/iferr/iferr-tests.ts
index f7377358cf..ce1bea725e 100644
--- a/types/iferr/iferr-tests.ts
+++ b/types/iferr/iferr-tests.ts
@@ -7,7 +7,7 @@ const { tiferr, throwerr, printerr } = iferr;
 
 const { readFile } = fs;
 
-const errcb = (err: Error | undefined) => { throw err; };
+const errcb = (err: Error) => { throw err; };
 
 readFile("test.txt", iferr(errcb, result => {
     Buffer.from("test", "utf8") === result;
diff --git a/types/iferr/index.d.ts b/types/iferr/index.d.ts
index c65c270b49..0b40866559 100644
--- a/types/iferr/index.d.ts
+++ b/types/iferr/index.d.ts
@@ -7,15 +7,15 @@ type nodeCallback<T> = (err: Error | undefined, ...a: T[]) => any;
 
 // Delegates to `succ` on sucecss or to `fail` on error
 // ex: Thing.load(123, iferr(cb, thing => ...))
-declare function iferr<T>(fail: (err: Error | undefined) => void, succ: (...result: T[]) => void): nodeCallback<T>;
+declare function iferr<T>(fail: (err: Error) => void, succ: (...result: T[]) => void): nodeCallback<T>;
 
 declare namespace iferr {
     // Delegates to `succ` on sucecss or to `fail` on error
     // ex: Thing.load(123, iferr(cb, thing => ...))
-    function iferr<T>(fail: (err: Error | undefined) => void, succ: (...result: T[]) => void): nodeCallback<T>;
+    function iferr<T>(fail: (err: Error) => void, succ: (...result: T[]) => void): nodeCallback<T>;
 
     // Like iferr, but also catches errors thrown from `succ` and passes to `fail`
-    function tiferr<T>(fail: (err: Error | undefined) => void, succ: (...result: T[]) => void): nodeCallback<T>;
+    function tiferr<T>(fail: (err: Error) => void, succ: (...result: T[]) => void): nodeCallback<T>;
 
     // Delegate to the success function on success, throws the error otherwise
     // ex: Thing.load(123, throwerr(thing => ...))