From 0bc4a1569af6ea5a98f4ee51a84ca770f302fc21 Mon Sep 17 00:00:00 2001
From: Gareth Jones <jones258@gmail.com>
Date: Sat, 6 Jul 2019 23:51:41 +1200
Subject: [PATCH] =?UTF-8?q?fix:=20=F0=9F=90=9B=20refactor=20`#newFdNumber`?=
 =?UTF-8?q?=20to=20be=20compatible=20w/=20`strictNullChecks`?=
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---
 src/volume.ts | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/volume.ts b/src/volume.ts
index cd9cc9ce..9733311a 100644
--- a/src/volume.ts
+++ b/src/volume.ts
@@ -655,7 +655,8 @@ export class Volume {
   }
 
   private newFdNumber(): number {
-    return this.releasedFds.length ? this.releasedFds.pop() : Volume.fd--;
+    const releasedFd = this.releasedFds.pop();
+    return typeof releasedFd === 'number' ? releasedFd : Volume.fd--;
   }
 
   createNode(isDirectory: boolean = false, perm?: number): Node {