gistfile1.txt

export default function log (target, name, descriptor) {
  let fn = descriptor.value;

  descriptor.value = function (...args) {
    console.log('calling', name, 'with', args);
    try {
      let out = fn.apply(this, args);
      console.log('got', out);
      return out;
    } catch (e) {
      console.log('caught', e.message);
      throw e;
    }
  };
}