I'm recently releasing pulsar node client 1.6, I'm very sorry, just now I deleted the pulsar-client package on npmjs by mistake, that doesn't seem to be recoverable, if you install pulsar-client you may see this warning `Package no longer supported`, I'm now releasing a small version for each branch, if there are any problems please reply this email, the current latest stable version is 1.5.2.
Thanks, Guangning