componentWillMount (before_mount callback), componentWillUpdate (before_update callback), componentWillReceiveProps (before_new_params callback) have been deprecated.

Here is the plan to replace the first two:

before_mount

The before_mount callback can be implemented as part of the render_wrapper method, so the callbacks get called just before calling the application render method.

before_update

The before_update callback can be implemented the same as before_mount, however, React did pass the "old-state" and "new-state" values to the callback. This notion is meaningless in Hyperstack, but there possibly could be code around that is using the lower level "props" and is depending on the old-state and new-state.

So for now we will use the react UNSAFE_componentWillUpdate callback (which gives no warning, but implements the legacy behavior, then in the callback we will check if the proc is receiving any parameters, and if so publish a deprecation notice that in the future these parameters will NOT be passed.

Then at some future release, the code will use the same mechanism as before_mount (i.e. it's just part of the render wrapper)

before_new_params

This is sort of being replaced by a static (read class level) call back called getDerivedStateFromProps but the whole thing is probably unnecessary in hyperstack since the hyper-state component manages state changes to avoid rerenders (which is the base reason for this being replaced.)

So we will just deprecate this method.