In v1, F2 had the idea of “Secure Apps” where apps were loaded into iFrames in order to isolate them from the parent page. This feature added a lot of complexity and bloat to the codebase and was a feature that was unused in practice. For v2, this feature has been removed.
F2 v1 provided some UI utility methods in the F2.UI namespace. These utilities
provided for things like loading spinners, modals, and multiple “views” for an
app. These features were built using jQuery, jQuery UI, and Bootstrap and were
largely unused. In v2, these features have been removed.
v1 of F2 utilized jQuery for DOM manipulation. v2 utilizes native javascript or
domify instead. In addition to jQuery,
jQuery UI and Bootstrap were bundled inside of F2 (in a closure). These extra
libraries were utilized for F2.UI. For v2, all of these libraries were removed
greatly reducing the overall file size and security posture of F2.
In addition to the updates mentioned previously, there were parts of F2 v1 that
were marked as deprecated. These parts have been removed in v2. For example, the
beforeAppRender, appRender, afterAppRender callbacks that were replaced by
F2.AppHandlers had been deprecated and now removed.