Package Exports
- babel-plugin-add-module-exports
This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (babel-plugin-add-module-exports) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.
Readme
BabelPlugin Add module.exports 
Fix Kill CommonJS default export behaviour - babel/babel#2212
Installation
npm install babel-plugin-add-module-exports --save-devWhy?
babel-plugin-transform-es2015-modules-commonjs@6.1.3 doesn't support the module.exports.
// index.js
let foo= 'bar'
export default 'baz'
export {foo}npm install babel-core@6.1.2 --global
npm install babel-preset-es2015 --save-dev
npm install babel-plugin-transform-es2015-modules-commonjs --save-dev
babel index.js --presets es2015 --plugins transform-es2015-modules-commonjs > bundle.js
# 'use strict';
#
# Object.defineProperty(exports, "__esModule", {
# value: true
# });
# var foo = 'bar';
# exports.default = 'baz';
# exports.foo = foo;Therefore, need to use the .default at NodeJS.
require('./bundle.js') // { default: 'baz', foo: 'bar' }
require('./bundle.js').default // 'baz'The babel-plugin-add-module-exports add the module.exports to EOF.
npm install babel-plugin-add-module-exports --save-dev
babel index.js --presets es2015 --plugins add-module-exports > bundle.js
# 'use strict';
#
# Object.defineProperty(exports, "__esModule", {
# value: true
# });
# var foo = 'bar';
# exports.default = 'baz';
# exports.foo = foo;
# module.exports = Object.assign(exports.default, exports);Therefore, .default is the unnecessary.
require('./bundle.js') // { [String: 'baz'] default: 'baz', foo: 'bar' }
require('./bundle.js')+'' // bazCan polyfill the Object.assign?
See also babel-plugin-transform-object-assign.
example:
npm install babel-plugin-transform-object-assign --save-dev
babel index.js --presets es2015 --plugins add-module-exports,transform-object-assign > bundle.js
# 'use strict';
#
# var _extends = Object.assign || function (target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i]; for (var key in source) { if (Object.prototype.hasOwnProperty.call(source, key)) { target[key] = source[key]; } } } return target; };
#
# Object.defineProperty(exports, "__esModule", {
# value: true
# });
# var foo = 'bar';
# exports.default = 'baz';
# exports.foo = foo;
# module.exports = _extends(exports.default, exports);