Add this to ignore class instances (things like Date and other general JS classes) in the symbols list

gistfile1.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
	<key>name</key>
	<string>Symbol List Banned Class Instance</string>
	<key>scope</key>
	<string>source.js meta.class.instance</string>
	<key>settings</key>
	<dict>
		<key>showInSymbolList</key>
		<string>0</string>
	</dict>
	<key>uuid</key>
	<string>c79eb889-2847-4f7a-b301-29a26807f274</string>
</dict>
</plist>