Failed to require relative path

[musicode]

source

define('common/a', [
    'require',
    'exports',
], function (require, exports) {
  return { name: '' };
});
  
define('common/b', [
    'require',
    'exports',
    './a'
], function (require, exports) {
    return require('./a');
});

output

;(function() {
var common_a = {}, common_b = {};
common_a = { name: '' };
// a is undefined
common_b = a;
}());