decorators-latest-proposal.js

export decorator @logged {
  @wrap(f => {
    const name = f.name;
    function wrapped(...args) {
      console.log(`starting ${name} with arguments ${args.join(", ")}`);
      f.call(this, ...args);
      console.log(`ending ${name}`);
    }
    Object.defineProperty(wrapped, "name", {
      value: name,
      configurable: true
    });
    return wrapped;
  })
}