From 627a04f381f9ce31be7063ec8b6c5193e8a65081 Mon Sep 17 00:00:00 2001
From: jcbit <58643970+jcbit@users.noreply.github.com>
Date: Sun, 21 Jun 2020 16:43:42 -0500
Subject: [PATCH 1/2] Fixed bug reported #546

_isEmpty only works for collections, here you are evaluating an individual item so something like checking for undefined would be best. This fixes my bug reported:
https://github.com/bitfinexcom/bitfinex-api-node/issues/546
---
 lib/transports/ws2.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/transports/ws2.js b/lib/transports/ws2.js
index facba4d0..3e85c0e8 100644
--- a/lib/transports/ws2.js
+++ b/lib/transports/ws2.js
@@ -1244,7 +1244,7 @@ class WSv2 extends EventEmitter {
     for (let k = 0; k < filterIndices.length; k++) {
       filterValue = filter[filterIndices[k]]
 
-      if (_isEmpty(filterValue) || filterValue === '*') {
+      if (filterValue === undefined || filterValue === '*') {
         continue
       }
 

From ffc5dcbae3eaff4ebf83c49976217b359b3a0879 Mon Sep 17 00:00:00 2001
From: jcbit <58643970+jcbit@users.noreply.github.com>
Date: Sat, 27 Jun 2020 21:38:10 -0500
Subject: [PATCH 2/2] Update ws2.js

---
 lib/transports/ws2.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/transports/ws2.js b/lib/transports/ws2.js
index 3e85c0e8..659c6c77 100644
--- a/lib/transports/ws2.js
+++ b/lib/transports/ws2.js
@@ -8,6 +8,7 @@ const CbQ = require('cbq')
 const _Throttle = require('lodash.throttle') // eslint-disable-line
 const _isArray = require('lodash/isArray')
 const _isEmpty = require('lodash/isEmpty')
+const _isUndefined = require('lodash/isUndefined')
 const _isString = require('lodash/isString')
 const _isNumber = require('lodash/isNumber')
 const _includes = require('lodash/includes')
@@ -1244,7 +1245,7 @@ class WSv2 extends EventEmitter {
     for (let k = 0; k < filterIndices.length; k++) {
       filterValue = filter[filterIndices[k]]
 
-      if (filterValue === undefined || filterValue === '*') {
+      if (_isUndefined(filterValue) || filterValue === '*') {
         continue
       }