EPSG Transformations in Leaflet

I'm migrating from the OpenLayers library to Leaflet and I have this problem:

The OpenLayers code transforms the EPSG coordinates: 4326 to EPSG: 3857:

var arCoordinates = ol.proj.transform(iarClickCoordinates, 'EPSG:4326', 'EPSG:3857');   

  

How can you do it in Leaflet?

Use Leaflet 1.3.0

I searched for it in google but I did not find much information.

Thank you.