From dbfc7546d32dffec7b154ed4db8a0c839d68fbda Mon Sep 17 00:00:00 2001
From: Gareth Jones <jones258@gmail.com>
Date: Sun, 7 Jul 2019 00:24:23 +1200
Subject: [PATCH] =?UTF-8?q?fix:=20=F0=9F=90=9B=20allow=20`flagsToNumber`?=
 =?UTF-8?q?=20to=20be=20called=20w/=20`undefined`?=
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---
 src/volume.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/volume.ts b/src/volume.ts
index b3b5c5b8..500c91ab 100644
--- a/src/volume.ts
+++ b/src/volume.ts
@@ -193,7 +193,7 @@ export type TFlagsCopy =
   | typeof constants.COPYFILE_FICLONE
   | typeof constants.COPYFILE_FICLONE_FORCE;
 
-export function flagsToNumber(flags: TFlags): number {
+export function flagsToNumber(flags: TFlags | undefined): number {
   if (typeof flags === 'number') return flags;
 
   if (typeof flags === 'string') {