Looking for a WORKING Bollinger Bands Indicator

[Yoganesh]

let customBBSettings = {

 optInTimePeriod: 20,
 optInNbDevUp: 2,
 optInNbDevDn: 2,
 optInMAType: 0
};

this.addTalibIndicator('mybb', 'bbands', customBBSettings);

this.BB = this.talibIndicators.mybb.result;
this.BB.upper = this.BB['outRealUpperBand'];
this.BB.middle = this.BB['outRealMiddleBand'];
this.BB.lower = this.BB['outRealLowerBand'];
this.bbGap = this.BB.upper - this.BB.lower;