Create any arbitrary structure when you don't have a constructor exported for it

createStructure.cocoascript.js

// Recursively create a struct
function makeStruct(def) {
  if (typeof def !== 'object') {
    return def;
  }
  const name = Object.keys(def)[0];
  const values = def[name];

  const structure = MOStruct.structureWithName_memberNames_runtime(name, Object.keys(values), null);

  Object.keys(values).map( member => {
    structure[member] = makeStruct(values[member]);
  });

  return structure;
}

// Usage, ie if we didn't have the definition of CGRectMake
function CGRectMake2(x, y, width, height) {
  return makeStruct({
    CGRect:{
      origin:{CGPoint:{x,y}},
      size:{CGSize:{width, height}},
  }});
}