feature request: disable initial visibility check

[adesurirey]

Great work on this package, thanks a lot.

I have several (like hundreds) visibility sensors in the same view which leads to several performances issues because of the onChange() event that gets fired for all sensors when mounted.

Is there a way to :

• disable initial visibillity check or
• set every sensor default state to not visible or
• fire onChange only if visible ?

This initial check also happens on every active props change.

I've tried a lot of things with no luck :/

[adesurirey]

changing line 101 from :

getInitialState: function () {
    return {
      isVisible: null,
      visibilityRect: {}
    };
  },

to:

getInitialState: function () {
    return {
      isVisible: false,
      visibilityRect: {}
    };
  },

solved my issue. Could we make it an option ? Like by passing an initialVisibility bool prop ?