From 4318b28198bbd365a72fcf7b3b066ede164f926c Mon Sep 17 00:00:00 2001
From: Robert Kawecki <robert+public@rkaw.pl>
Date: Tue, 21 Jul 2020 13:34:59 +0200
Subject: [PATCH] Integrate falsy check into isBerWriter to avoid long inline
 conditions

For #629
---
 lib/filters/filter.js | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/lib/filters/filter.js b/lib/filters/filter.js
index f2e311b..fc4d061 100644
--- a/lib/filters/filter.js
+++ b/lib/filters/filter.js
@@ -35,7 +35,8 @@ function isFilter (filter) {
 }
 
 function isBerWriter (ber) {
-  return (
+  return Boolean(
+    ber &&
     typeof (ber) === 'object' &&
     typeof (ber.startSequence) === 'function' &&
     typeof (ber.endSequence) === 'function'
@@ -44,7 +45,7 @@ function isBerWriter (ber) {
 
 function mixin (target) {
   target.prototype.toBer = function toBer (ber) {
-    if (!ber || !isBerWriter(ber)) { throw new TypeError('ber (BerWriter) required') }
+    if (!isBerWriter(ber)) { throw new TypeError('ber (BerWriter) required') }
 
     ber.startSequence(TYPES[this.type])
     ber = this._toBer(ber)