gh-ol-mvt-style.js

function getStyle(feature, resolution) {
  var color = "green";
  const name = feature.get("name");
  if (name.startsWith("A ")) color = "blue";
  else if (name.startsWith("L ")) color =  "red";
  return new ol.style.Style({
    stroke: new ol.style.Stroke({
      color: color,
      width: 2
    })
  });
}