First verify that the js code is compiled to es5 [You can use buildES5 script]
/opt/zimbra/bin/zmzimletctl createZip zimlet_prod
Enable zimlet in COS
/opt/zimbra/bin/zmzimletctl deploy zimlet_prod.zip
/opt/zimbra/libexec/zmfixperms
/opt/zimbra/bin/zmzimletctl listZimlets
/opt/zimbra/bin/zmzimletctl undeploy zimlet_prod
/opt/zimbra/bin/zmprov fc zimlet
su - zimbra
zmprov mcf zimbraZimletJspEnabled TRUE
zmmailboxdctl restart
Directory of external libraries(jars) of the zimlets with java backend
/opt/zimbra/jetty_base/webapps/zimlet/WEB-INF/lib/