TP example in a gekko strat

example.js

strat.init = function() {

  // your stuff
  this.tp = false;
}

strat.check = function(candle) {
  
  if(/* your own logic on when to buy */) {
    this.advice('long');
    // store a reference:
    this.tp = candle.close + 10; // example: TP 10 above prive
  }

  if(this.tp) {
    // you might want to take profit, lets check
    if(candle.close >= this.tp) {
      // price is equal to or above your defined tp price
      this.advice('short');
      // unset the reference:
      this.tp = false;
    }
  }
}