primus ping-pong for own websocket

primus-ping-pong.js

const pingRegex = /^primus::ping::(\d{13})$/
  private onMessage = (messageEvent: MessageEvent) => {
    try {
      const data = JSON.parse(messageEvent.data)
      if (pingRegex.test(data)) {
        let pingResults = pingRegex.exec(data)
        if (pingResults) {
          this.pong(pingResults[1])
        }
      } else if (data.context && data.context === 'response') {
        this.parseResponse(data)
      }
    } catch (error) {
      console.error('Unparsable Response', error)
    }
  }

  private pong = (time: string) => {
    if (this.socket) {
      this.socket.send(`"primus::pong::${time}"`)
    }
  }