curve.ts

var curve = figma.createVector()
    
    var startX = 0 + " "
    var startY = 100 + " "
    var controlPointX1 = (100 * 0.5) + " "
    var controlPointY1 = (100 * 0) + " "
    var controlPointX2 = (100 * 0.14) + " "
    var controlPointY2 = (100 * .99) + " "
    var endX = 100 + " "
    var endY = 0

    var bezierExpression = "M " + startX + startY + "C " + controlPointX1 + controlPointY1 + controlPointX2 + controlPointY2 + endX + endY
    

    curve.vectorPaths = [{
      windingRule: "NONE",
      data: bezierExpression

      
    }]