@babel/plugin-transform-modules-systemjs

This plugin transforms ECMAScript modules to SystemJS. Note that only the syntax of import/export statements (import "./mod.js") and import expressions (import('./mod.js')) is transformed, as Babel is unaware of different resolution algorithms between implementations of ECMAScript modules and SystemJS.

Out

System.register([], function(_export, _context) {
    setters: [],
    execute: function() {
      _export("default", 42);
});

Without options:

{
  "plugins": ["@babel/plugin-transform-modules-systemjs"]