How to use the y-protocols/awareness.js.encodeAwarenessUpdate function in y-protocols

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 () {

const doc = room.doc
  let sendReply = false
  switch (messageType) {
    case messageSync:
      encoding.writeVarUint(encoder, messageSync)
      const syncMessageType = syncProtocol.readSyncMessage(decoder, encoder, doc, room)
      if (syncMessageType === syncProtocol.messageYjsSyncStep2 && !room.synced) {
        syncedCallback()
      }
      if (syncMessageType === syncProtocol.messageYjsSyncStep1) {
        sendReply = true
      }
      break
    case messageQueryAwareness:
      encoding.writeVarUint(encoder, messageAwareness)
      encoding.writeVarUint8Array(encoder, awarenessProtocol.encodeAwarenessUpdate(awareness, Array.from(awareness.getStates().keys())))
      sendReply = true
      break
    case messageAwareness:
      awarenessProtocol.applyAwarenessUpdate(awareness, decoding.readVarUint8Array(decoder), room)
      break
    case messageBcPeerId: {
      const add = decoding.readUint8(decoder) === 1
      const peerName = decoding.readVarString(decoder)
      if (peerName !== room.peerId && ((room.bcConns.has(peerName) && !add) || (!room.bcConns.has(peerName) && add))) {
        const removed = []
        const added = []
        if (add) {
          room.bcConns.add(peerName)
          added.push(peerName)
        } else {
          room.bcConns.delete(peerName)

this._awarenessUpdateHandler = ({ added, updated, removed }, origin) => {
      const changedClients = added.concat(updated).concat(removed)
      const encoder = encoding.createEncoder()
      encoding.writeVarUint(encoder, messageAwareness)
      encoding.writeVarUint8Array(encoder, awarenessProtocol.encodeAwarenessUpdate(this.awareness, changedClients))
      broadcastRoomMessage(this, encoding.toUint8Array(encoder))
    }
    this.doc.on('update', this._docUpdateHandler)