leaflet-default

Create a full screen leaflet map just like that:

var map = require('leaflet-default')()

Then use broserify to create your bundle. Or just use beefy to skip creating a html page.

If you want to add a point just do

var L = require('leaflet')
L.marker([0,0])
  .bindPopup('Null Island!')
  .addTo(map)