code: function staticTree (signalActions) {
    var actions = [];
    var branches = transformBranch(signalActions, [], [], actions, false);
    return { actions, branches };
  }
docs: Transform signal actions to static tree.
  Every function will be exposed as object definition,
  that will store meta information and function call results.
  @param {Array} signalActions
  @returns {{ actions: [], branches: [] }}