How to use the lib0/encoding.js.createEncoder function in lib0

flushRandomMessage () {
    const prng = this.prng
    const conns = Array.from(this.onlineConns).filter(conn => conn.receiving.size > 0)
    if (conns.length > 0) {
      const receiver = random.oneOf(prng, conns)
      const [sender, messages] = random.oneOf(prng, Array.from(receiver.receiving))
      const m = messages.shift()
      if (messages.length === 0) {
        receiver.receiving.delete(sender)
      }
      const encoder = encoding.createEncoder()
      receiver.mMux(() => {
        // console.log('receive (' + sender.userID + '->' + receiver.userID + '):\n', syncProtocol.stringifySyncMessage(decoding.createDecoder(m), receiver))
        // do not publish data created when this function is executed (could be ss2 or update message)
        syncProtocol.readSyncMessage(decoding.createDecoder(m), encoder, receiver)
      })
      if (encoding.length(encoder) > 0) {
        // send reply message
        sender._receive(encoding.toBuffer(encoder), receiver)
      }
      return true
    }
    return false
  }
  /**

connect () {
    if (!this.tc.onlineConns.has(this)) {
      this.tc.onlineConns.add(this)
      const encoder = encoding.createEncoder()
      syncProtocol.writeSyncStep1(encoder, this)
      // publish SyncStep1
      broadcastMessage(this, encoding.toBuffer(encoder))
      this.tc.onlineConns.forEach(remoteYInstance => {
        if (remoteYInstance !== this) {
          // remote instance sends instance to this instance
          const encoder = encoding.createEncoder()
          syncProtocol.writeSyncStep1(encoder, remoteYInstance)
          this._receive(encoding.toBuffer(encoder), remoteYInstance)
        }
      })
    }
  }
  /**

this.tc.onlineConns.forEach(remoteYInstance => {
        if (remoteYInstance !== this) {
          // remote instance sends instance to this instance
          const encoder = encoding.createEncoder()
          syncProtocol.writeSyncStep1(encoder, remoteYInstance)
          this._receive(encoding.toBuffer(encoder), remoteYInstance)
        }
      })
    }

disconnect () {
    // signal through all available signaling connections
    signalingConns.forEach(conn => {
      if (conn.connected) {
        conn.send({ type: 'unsubscribe', topics: [this.name] })
      }
    })
    awarenessProtocol.removeAwarenessStates(this.awareness, [this.doc.clientID], 'disconnect')
    // broadcast peerId removal via broadcastchannel
    const encoderPeerIdBc = encoding.createEncoder()
    encoding.writeVarUint(encoderPeerIdBc, messageBcPeerId)
    encoding.writeUint8(encoderPeerIdBc, 0) // remove peerId from other bc peers
    encoding.writeVarString(encoderPeerIdBc, this.peerId)
    broadcastBcMessage(this, encoding.toUint8Array(encoderPeerIdBc))

    bc.unsubscribe(this.name, this._bcSubscriber)
    this.bcconnected = false
    this.doc.off('update', this._docUpdateHandler)
    this.awareness.off('change', this._awarenessUpdateHandler)
    this.webrtcConns.forEach(conn => conn.destroy())
  }
  destroy () {

this._docUpdateHandler = (update, origin) => {
      if (origin !== this) {
        const encoder = encoding.createEncoder()
        encoding.writeVarUint(encoder, messageSync)
        syncProtocol.writeUpdate(encoder, update)
        broadcastRoomMessage(this, encoding.toUint8Array(encoder))
      }
    }
    /**

const readMessage = (room, buf, syncedCallback) => {
  const decoder = decoding.createDecoder(buf)
  const encoder = encoding.createEncoder()
  const messageType = decoding.readVarUint(decoder)
  if (room === undefined) {
    return null
  }
  const awareness = room.awareness
  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

export const encodeStateVector = doc => {
  const encoder = encoding.createEncoder()
  writeDocumentStateVector(encoder, doc)
  return encoding.toUint8Array(encoder)
}

export const computeUpdateMessageFromTransaction = transaction => {
  if (transaction.deleteSet.clients.size === 0 && !map.any(transaction.afterState, (clock, client) => transaction.beforeState.get(client) !== clock)) {
    return null
  }
  const encoder = encoding.createEncoder()
  sortAndMergeDeleteSet(transaction.deleteSet)
  writeStructsFromTransaction(encoder, transaction)
  writeDeleteSet(encoder, transaction.deleteSet)
  return encoder
}