Seonglae ChoNode.js's native module system was CommonJs.
It has experimental support for the standard ES6 module system and using a .mjs file extension is part of one way to trigger that support.
14에서는 공존
What is the difference between .js and .mjs files?
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https://stackoverflow.com/questions/57492546/what-is-the-difference-between-js-and-mjs-files
