shitty module bundler

bundle.js

const renderBootstrap = body => `const modules = {};
function require(name) {
  return modules[name] && modules[name].exports;
}
function define(name, definition) {
  const module = {};
  definition(require, module);
  modules[name] = module;
}
${body}
`;

const renderModule = module => `define('${module.name}', function(require, module) {
${module.body.split('\n').join('  \n')}
});
`;

const pack = modules => {
  const seen = new Set()
  return renderBootstrap(modules.map(module => {
    if (seen.has(module.name)) throw new Error('duplicate modules')
    seen.add(module.name)
    return renderModule(module)
  }).join('\n'));
};