Opaque type for transition state storage.

Extended type for the parent model holding the transition.

Empty transition state, as initial value in the model.

Transition msg, to be wrapped in your own msg type.

Start the transition with the following parameters:

• tagger to wrap Transit's Msg into your app's Msg type (consistent with tick signature, saves you one Cmd.map)
• parentMsg to send at end of exit
• durations of transition steps (exit phase then enter phase)
• parent is the model storing the Transition, to update with new transition state

Returns a tuple that you can directly emit from your update.

Where all the logic happens. Run transition steps, and triggers timeline's parent message when needed.

• tagger to wrap Transit's msg into app's Msg type, has to be same type of timeline.msg,
• msg is the Transit message to process,
• parent is the model storing the Transition, for transition state update.

Animation frame subscription. Must be called by your component's subscription function.

Extract current animation value (a float between 0 and 1).

Extract current animation step.

Transition step: Exit -> send message -> Enter -> Done.