How to use the lib0/encoding.js.writeUint8 function in lib0

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 () {

export const writeRelativePosition = (encoder, rpos) => {
  const { type, tname, item } = rpos
  if (item !== null) {
    encoding.writeVarUint(encoder, 0)
    writeID(encoder, item)
  } else if (tname !== null) {
    // case 2: found position at the end of the list and type is stored in y.share
    encoding.writeUint8(encoder, 1)
    encoding.writeVarString(encoder, tname)
  } else if (type !== null) {
    // case 3: found position at the end of the list and type is attached to an item
    encoding.writeUint8(encoder, 2)
    writeID(encoder, type)
  } else {
    throw error.unexpectedCase()
  }
  return encoder
}

write (encoder, offset) {
    const origin = offset > 0 ? createID(this.id.client, this.id.clock + offset - 1) : this.origin
    const rightOrigin = this.rightOrigin
    const parentSub = this.parentSub
    const info = (this.content.getRef() & binary.BITS5) |
      (origin === null ? 0 : binary.BIT8) | // origin is defined
      (rightOrigin === null ? 0 : binary.BIT7) | // right origin is defined
      (parentSub === null ? 0 : binary.BIT6) // parentSub is non-null
    encoding.writeUint8(encoder, info)
    if (origin !== null) {
      writeID(encoder, origin)
    }
    if (rightOrigin !== null) {
      writeID(encoder, rightOrigin)
    }
    if (origin === null && rightOrigin === null) {
      const parent = this.parent
      if (parent._item === null) {
        // parent type on y._map
        // find the correct key
        const ykey = findRootTypeKey(parent)
        encoding.writeVarUint(encoder, 1) // write parentYKey
        encoding.writeVarString(encoder, ykey)
      } else {
        encoding.writeVarUint(encoder, 0) // write parent id

const broadcastBcPeerId = room => {
  // broadcast peerId via broadcastchannel
  const encoderPeerIdBc = encoding.createEncoder()
  encoding.writeVarUint(encoderPeerIdBc, messageBcPeerId)
  encoding.writeUint8(encoderPeerIdBc, 1)
  encoding.writeVarString(encoderPeerIdBc, room.peerId)
  broadcastBcMessage(room, encoding.toUint8Array(encoderPeerIdBc))
}

_toBinary (encoder) {
    encoding.writeUint8(encoder, getStructReference(this.constructor))
    let info = 0
    if (this._origin !== null) {
      info += 0b1 // origin is defined
    }
    // TODO: remove
    /* no longer send _left
    if (this._left !== this._origin) {
      info += 0b10 // do not copy origin to left
    }
    */
    if (this._right_origin !== null) {
      info += 0b100
    }
    if (this._parentSub !== null) {
      info += 0b1000
    }

export const writeRelativePosition = (encoder, rpos) => {
  const { type, tname, item } = rpos
  if (item !== null) {
    encoding.writeVarUint(encoder, 0)
    ID.writeID(encoder, item)
  } else if (tname !== null) {
    // case 2: found position at the end of the list and type is stored in y.share
    encoding.writeUint8(encoder, 1)
    encoding.writeVarString(encoder, tname)
  } else if (type !== null) {
    // case 3: found position at the end of the list and type is attached to an item
    encoding.writeUint8(encoder, 2)
    ID.writeID(encoder, type)
  } else {
    throw error.unexpectedCase()
  }
  return encoder
}

export const writeRelativePosition = (encoder, rpos) => {
  const { type, tname, item } = rpos
  if (item !== null) {
    encoding.writeVarUint(encoder, 0)
    writeID(encoder, item)
  } else if (tname !== null) {
    // case 2: found position at the end of the list and type is stored in y.share
    encoding.writeUint8(encoder, 1)
    encoding.writeVarString(encoder, tname)
  } else if (type !== null) {
    // case 3: found position at the end of the list and type is attached to an item
    encoding.writeUint8(encoder, 2)
    writeID(encoder, type)
  } else {
    throw error.unexpectedCase()
  }
  return encoder
}

_toBinary (encoder) {
    encoding.writeUint8(encoder, getStructReference(this.constructor))
    this._targetID.encode(encoder)
    encoding.writeVarUint(encoder, this._length)
  }

write (encoder, offset) {
    encoding.writeUint8(encoder, structGCRefNumber)
    encoding.writeVarUint(encoder, this.length - offset)
  }
}