onExpire does not return the value of the cached item if storage is not in memory

[BovineEnthusiast]

The following returns the value of the cached item only if it is present in the expiresHeap:

{
    key: 'removeExpired',
    value: function removeExpired() {
      // ...
      while ((expiredItem = this.$$expiresHeap.peek()) && expiredItem.expires <= now) { 
        expired[expiredItem.key] = expiredItem.value ? expiredItem.value : null;
        this.$$expiresHeap.pop();
      }

      // ...

      if (this.$$onExpire) {
        Object.keys(expired).forEach(function (key) {
          _this6.$$onExpire(key, expired[key]);
        });
      }
      // ...
    }
}

However, the heap will only contain the value if you're using in-memory storage:

{
    key: 'put',
    value: function put(key, value) {
      // ...

      if (this.$$storage) {
        // ...
        this.$$expiresHeap.push({
          key: key,
          expires: item.expires
        });
      } else {
        // ...
        
        this.$$expiresHeap.push(item);
        // ...
      }
     // ...
    }
}

Ideally, it should work regardless of what storage option you use e.g. local storage.