如何在JavaScript函数类中编辑属性？

我有基于纯JavaScript的此类：

var DrawFeatureP = /*@__PURE__*/(function (Draw) {
    function DrawFeatureP() {
        debugger
        Draw.call(this, {
            source: new ol.layer.Vector({ source: new ol.source.Vector() }),
            type: 'change this property from function in pottom'
        });

        document.getElementById('lineToggle').onclick = this.handleDrawFeature.bind(this);
     }


    if (Draw) DrawFeatureP.__proto__ = Draw;
    DrawFeatureP.prototype = Object.create(Draw && Draw.prototype);
    DrawFeatureP.prototype.constructor = DrawFeatureP;

    DrawFeatureP.prototype.handleDrawFeature = function handleDraw(evt) {
        //when is function is fired how ca i set 'type' property?
    };

    return DrawFeatureP;
}(ol.interaction.Draw));

当该函数被触发时：

   DrawFeatureP.prototype.handleDrawFeature = function handleDraw(evt) {
            //when is function is fired how ca I set 'type' property?
        };

我需要更改'type'属性：

type: 'change this property from function in the bottom'

我的问题是如何从handleDraw函数编辑type属性？