How to use the y-protocols/sync.js.writeSyncStep2 function in y-protocols

// signal through all available signaling connections
    announceSignalingInfo(this)
    const roomName = this.name
    bc.subscribe(roomName, this._bcSubscriber)
    this.bcconnected = true
    // broadcast peerId via broadcastchannel
    broadcastBcPeerId(this)
    // write sync step 1
    const encoderSync = encoding.createEncoder()
    encoding.writeVarUint(encoderSync, messageSync)
    syncProtocol.writeSyncStep1(encoderSync, this.doc)
    broadcastBcMessage(this, encoding.toUint8Array(encoderSync))
    // broadcast local state
    const encoderState = encoding.createEncoder()
    encoding.writeVarUint(encoderState, messageSync)
    syncProtocol.writeSyncStep2(encoderState, this.doc)
    broadcastBcMessage(this, encoding.toUint8Array(encoderState))
    // write queryAwareness
    const encoderAwarenessQuery = encoding.createEncoder()
    encoding.writeVarUint(encoderAwarenessQuery, messageQueryAwareness)
    broadcastBcMessage(this, encoding.toUint8Array(encoderAwarenessQuery))
    // broadcast local awareness state
    const encoderAwarenessState = encoding.createEncoder()
    encoding.writeVarUint(encoderAwarenessState, messageAwareness)
    encoding.writeVarUint8Array(encoderAwarenessState, awarenessProtocol.encodeAwarenessUpdate(this.awareness, [this.doc.clientID]))
    broadcastBcMessage(this, encoding.toUint8Array(encoderAwarenessState))
  }
  disconnect () {