Svelte Import issue

[ZMilosevich]

I building map component (Leaflet + PruneCluster). PruneCluster performance is much faster comparing to MarkerClustering and I love it!. My main issue was importing { PruneCluster, PruneClusterForLeaflet } to component and I fix it by editing prunecluster.js and adding 'export',

export var PruneCluster
export var PruneClusterForLeaflet

so in the next build is it possible to add 'export' and I hope it won't break other framework's.