How to use the phoenix.Presence.syncDiff function in phoenix

const handlePresenceDiff = (diff) => {
      console.log('presence_diff', diff);
      const oldPresence = this.stateBuffer.presence;
      const syncedPresence = Presence.syncDiff(oldPresence, diff);
      this.updateState({ presence: { $set: syncedPresence } });

      const handleJoins = joins => Object.keys(joins).forEach(this.handleJoin);
      const handleLeaves = leaves => Object.keys(leaves).forEach(this.handleLeave);
      handleJoins(diff.joins);
      handleLeaves(diff.leaves);
    };

interfaceChannel.on('presence_diff', diff => {
            presences = Presence.syncDiff(presences, diff)
            dispatch(updatePresences(Presence.list(presences, listBy)))
          })

room.on("presence_diff", diff => {
      presences = Presence.syncDiff(presences, diff)
      const users = values(presences).map(presence => presence.user)
      this.setState({ users })
    })

channel.on('presence_diff', (diff) => {
      presences = Presence.syncDiff(presences, diff);
      syncPresentUsers(dispatch, presences);
    });

channel.on('presence_diff', (diff) => {
            presences = Presence.syncDiff(presences, diff)
            store.dispatch('syncPresentUsers', presences)
          })

this.channel.on("presence_diff", diff => {
      this.setState({
        ...this.state,
        presences: Presence.syncDiff(this.state.presences, diff)
      });
    });