Remove last point from Draw Interaction in Ol3

Question

I am trying to remove the last point in a polygon draw feature on esc key.

The following code do not work. It seems to remove it when it draw the area part, but the vertex is stil there.

var geom :ol.geom.Polygon = null;
draw.on("drawstart",(event) => {
    console.log(event);
    var feature :ol.Feature= event.feature;
    console.log(feature);
    geom = feature.getGeometry<ol.geom.Polygon>();
});

$(document).keyup((e)=> {
    if (e.keyCode === 27) {
        var coords = geom.getCoordinates()[0];
        if(coords.length>1)
            geom.setCoordinates([coords.slice(0, coords.length - 2)]);
    }
});

Answer 1

OpenLayers 3 has a new solution to this with the Draw.removeLastPoint() method. Works like a charm!

draw = new ol.interaction.Draw({
  source:source,
  type: /** @type (ol.geom.GeometryType) */ ('Polygon')
})

draw.on('drawstart',
  function(evt){
    $(document).on('keyup', function(event){
      if(event.keyCode === 27){
        draw.removeLastPoint();
       }
     });
});