2023-11-22, Version 20.10.0 'Iron' (LTS), @targos --experimental-default-type flag to flip module defaults The new flag --experimental-default-type can be used to flip the default module system used by Node.js. Input that is already explicitly defined as ES modules or CommonJS, such as by a package.json "type" field or .mjs/.cjs file extension or the --input-type flag, is unaffected.