javascript-package-template/src/index.js

// rollup打包，必须使用ESModule
import getName from './module-a/index';
import setName from './module-b/index';

function User(name) {
  this.name = name;
}

User.prototype.getName = getName;
User.prototype.setName = setName;

const user = new User('myName');

export default { user };