See Javascript Modules, ES Modules, and Modules everywhere.
See also Client Type Modules and Smallest Wiki Explained.
See also https://esm.sh/ – A fast, global content delivery network for NPM packages with ES Module format. github 
~
DOT strict digraph rankdir=LR node [style=filled fillcolor=lightyellow penwidth=3 color=black fontname="Helvetica"] HERE NODE node [style=filled fillcolor=lightblue] WHERE /^⇒/ LINKS HERE -> NODE node [style=filled fillcolor=white] HERE NODE WHERE /^⇒/ LINKS HERE -> NODE node [style=filled fillcolor=white penwidth=3 color=black] LINKS HERE -> NODE node [style=filled fillcolor=white penwidth=1 color=black] HERE NODE LINKS HERE -> NODE node [style="filled,rounded,dotted" fillcolor=white] edge [style=dotted] HERE NODE BACKLINKS NODE -> HERE