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---
id: babel-plugin-transform-modules-systemjs
title: @babel/plugin-transform-modules-systemjs
sidebar_label: SystemJS
---
NOTE: This plugin is included in
@babel/preset-env
under themodules
option
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.
In
export default 42;
Out
System.register([], function(_export, _context) {
return {
setters: [],
execute: function() {
_export("default", 42);
},
};
});
For dynamic import support (import('./lazy.js').then(m => ...)
), enable the @babel/plugin-syntax-dynamic-import plugin before this one.
npm install --save-dev @babel/plugin-transform-modules-systemjs
Without options:
{
"plugins": ["@babel/plugin-transform-modules-systemjs"]
}
With options:
{
"plugins": [
[
"@babel/plugin-transform-modules-systemjs",
{
// outputs SystemJS.register(...)
"systemGlobal": "SystemJS"
}
]
]
}
babel --plugins @babel/plugin-transform-modules-systemjs script.js
require("@babel/core").transformSync("code", {
plugins: ["@babel/plugin-transform-modules-systemjs"],
});