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Node.js's original module system is CommonJs (which uses require and module.exports).
Since Node.js was created, the ECMAScript module system (which uses import and export) has become standard and Node.js has added support for it.
Node.js will treat .cjs files as CommonJS modules and .mjs files as ECMAScript modules. It will treat .js files as whatever the default module system for the project is (which is CommonJS unless package.json says "type": "module",).
In this npm:
.. we fail to scan this (large, 5MB) map file:
We should treat it as a map file, and hence extract it content in map smaller files
.mjs and .cjs files are JavaScript as explained in https://stackoverflow.com/a/57492606/302521
See also: