From f2ea3f1c7aa094243cc916c5f8fe716efc6c9b11 Mon Sep 17 00:00:00 2001
From: Gareth Jones <jones258@gmail.com>
Date: Thu, 11 Jul 2019 18:46:34 +1200
Subject: [PATCH] =?UTF-8?q?fix:=20=F0=9F=90=9B=20refactor=20`#ftruncate`?=
 =?UTF-8?q?=20to=20be=20compatible=20w/=20`strictNullChecks`?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 src/volume.ts | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/volume.ts b/src/volume.ts
index a9edcf52..3ca91150 100644
--- a/src/volume.ts
+++ b/src/volume.ts
@@ -1733,7 +1733,9 @@ export class Volume {
   ftruncate(fd: number, callback: TCallback<void>);
   ftruncate(fd: number, len: number, callback: TCallback<void>);
   ftruncate(fd: number, a: TCallback<void> | number, b?: TCallback<void>) {
-    const [len, callback] = getArgAndCb<number, void>(a, b);
+    const len: number = typeof a === 'number' ? a : 0;
+    const callback: TCallback<void> = validateCallback(typeof a === 'number' ? b : a);
+
     this.wrapAsync(this.ftruncateBase, [fd, len], callback);
   }