src/keyboard.js
function _increaseSequence(nextAction) {
      return function() {
        that._nextExpectedAction = nextAction;
        ++that._sequenceLevels[combo];
        _resetSequenceTimer.call(that);
      };
    }
function _increaseSequence(nextAction) {
      return function() {
        that._nextExpectedAction = nextAction;
        ++that._sequenceLevels[combo];
        _resetSequenceTimer.call(that);
      };
    }
function _increaseSequence ( nextAction ) { return function ( ) { that . _nextExpectedAction = nextAction ; ++ that . _sequenceLevels [ combo ] ; _resetSequenceTimer . call ( that ) ; } ; }
callback to increase the sequence level for this sequence and reset
all other sequences that were active

@param {string} nextAction
@returns {Function}
callback to increase the sequence level for this sequence and reset all other sequences that were active