This plugin transforms ES2015 modules to CommonJS.
In
export default 42;Out
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.default = 42;npm install --save-dev babel-plugin-transform-es2015-modules-commonjs.babelrc
// without options
{
"plugins": ["transform-es2015-modules-commonjs"]
}
// with options
{
"plugins": [
["transform-es2015-modules-commonjs", {
"allowTopLevelThis": true
}]
]
}babel --plugins transform-es2015-modules-commonjs script.jsrequire("babel-core").transform("code", {
plugins: ["transform-es2015-modules-commonjs"]
});boolean, defaults to false.
As per the spec, import and export are only allowed to be used at the top
level. When in loose mode these are allowed to be used anywhere.
And by default, when using exports with babel a non-enumerable __esModule property
is exported.
var foo = exports.foo = 5;
Object.defineProperty(exports, "__esModule", {
value: true
});In environments that don't support this you can enable loose mode on es6.modules
and instead of using Object.defineProperty an assignment will be used instead.
var foo = exports.foo = 5;
exports.__esModule = true;