Class RegisteredHook

Returns an object which has all the criteria match paths as keys and true as values, i.e.:

{
  to: true,
  from: true,
  entering: true,
  exiting: true,
  retained: true,
}

Create a IMatchingNodes object from the TransitionHookTypes that is roughly equivalent to:

let matches: IMatchingNodes = {
  to:       _matchingNodes([tail(treeChanges.to)],   mc.to),
  from:     _matchingNodes([tail(treeChanges.from)], mc.from),
  exiting:  _matchingNodes(treeChanges.exiting,      mc.exiting),
  retained: _matchingNodes(treeChanges.retained,     mc.retained),
  entering: _matchingNodes(treeChanges.entering,     mc.entering),
};

Given an array of PathNodes, and a HookMatchCriterion, returns an array containing the PathNodes that the criteria matches, or null if there were no matching nodes.

Returning null is significant to distinguish between the default "match-all criterion value" of true compared to a () => true function, when the nodes is an empty array.

This is useful to allow a transition match criteria of entering: true to still match a transition, even when entering === []. Contrast that with entering: (state) => true which only matches when a state is actually being entered.