Using files in this gist as input to jsbuild will result in dependency order test.js, One.js, Two.js which will fail since Two.js is needed when defining One.js. The circular dependency is silly but valid.... Two.js should have higher precedence than One.js when ordering because it is used as a base class, Two.js only needs One.js when invoking …

build.cfg

[test.js]
root = src
first = 
  test.js

One.js

/*
 * @requires two/Two.js
 */
function One() { }
Two.prototype = new Two();

test.js

// intentionally empty

Two.js

/*
 * @requires one/One.js
 */
function Two() { }
Two.prototype.makeOne = function() { return new One(); }