How to use the pubsub-js.unsubscribe function in pubsub-js

this.nextExecutionAddress = null
    this.hasLoaded = false

    this.inspectionAddress = null

    this.cellSprite = null
    this.nextExecutionSprite = null
    this.sprites = []

    this.state = {
      height: 0,
      width: 0
    }

    // oddly needs to happen here as unmount can happen AFTER a new instance has mounted :s
    PubSub.unsubscribe('CORE_ACCESS')
    PubSub.unsubscribe('RESET_CORE')
    PubSub.unsubscribe('NEXT_EXECUTION')

    PubSub.subscribe('CORE_ACCESS', (msg, data) => {
      this.messages = this.messages.concat(data)
    })

    PubSub.subscribe('RESET_CORE', (msg, data) => {
      this.messages = []
      this.init()
    })

    PubSub.subscribe('NEXT_EXECUTION', (msg, data) => {
      this.nextExecutionAddress = data.address
    })

componentWillUnmount () {
    // Unsubscribe from event once unmounting
    PubSub.unsubscribe(this.subEvent)
    this._isMounted = false
  }

componentWillUnmount() {
                PubSub.unsubscribe(this.tabShowToken);
                PubSub.unsubscribe(this.tabHideToken);
            }

componentWillUnmount() {
    PubSub.unsubscribe('TASK_COUNT')
    PubSub.unsubscribe('CORE_INITIALISE')
  }

this.pubsubTokens.forEach((token) => {
            pubsub.unsubscribe(token);
        });
        this.pubsubTokens = [];

disconnect: function(token) {
      PubSub.unsubscribe(token);
    },

_.each(this.pubsubTokens, (token) => {
            pubsub.unsubscribe(token);
        });
        this.pubsubTokens = [];

componentWillUnmount () {
    this._isMounted = false
    PubSub.unsubscribe(this.subEvent)
  }

componentWillUnmount() {
        PubSub.unsubscribe(this.clearSearchPubSub);
    }