How to use the rsp-client.ServerState.PUBLISH_STATE_INCREMENTAL function in rsp-client

const serverFilter = server => server.publishState === ServerState.PUBLISH_STATE_NONE ||
                                           server.publishState === ServerState.PUBLISH_STATE_INCREMENTAL ||
                                           server.publishState === ServerState.PUBLISH_STATE_UNKNOWN;
            const serverId = await this.selectServer(rsp.id, 'Select server to remove deployment from', serverFilter);