Convert FeatureLike type into GeoJSON feature?

Question

How to convert Feature type into GeoJSON feature?

I have tried this:

var feature: FeatureLike;
var writer = new GeoJSON();
const res = writer.writeFeatureObject(feature);
console.log(res);

Answer 1

The GeoJSON writeFeatureObject method only takes a Feature. If you had a RenderFeature you would need to convert it to a Feature

const res = writer.writeFeatureObject(feature instanceof RenderFeature ? toFeature(feature) : feature);

https://openlayers.org/en/latest/apidoc/module-ol_render_Feature.html#.toFeature