get coordinates event map openlayers 4.6.5 ~ 5

Okay, turns out it just works with event.coordinate, displaying coordinates in the SRC defined in the layer

This code will work. Note that coordinates you will get are in EPSG:3857 projection use ol.proj.transform() to convert them in to EPSG:4326 projection. To know more about projections visit https://lyzidiamond.com/posts/4326-vs-3857. You must read this if you are going to work on openlayers frequently.

const localmap = new ol.Map({
        layers: [
            new ol.layer.Tile({
                source: new ol.source.OSM()
            })
        ],
        target: 'map',
        view: new ol.View({
            center: [0, 0],
            zoom: 2
        })
});

localmap.on('singleclick', function (evt) {
    console.log(evt.coordinate);

    // convert coordinate to EPSG-4326
    console.log(ol.proj.transform(evt.coordinate, 'EPSG:3857', 'EPSG:4326'));
});