message: Added deprecation warning for ! decorators
diff: @@ -120,6 +120,8 @@ export class TSHelper {
  const dec = new Decorator(decStr.substr(1));
  if (dec.kind !== undefined) {
  decMap.set(dec.kind, dec);
  + console.warn(`[Deprecated] Decorators with ! are being deprecated, `
  + + `use @${decStr.substr(1)} instead`);
  } else {
  console.warn(`Encountered unknown decorator ${decStr}.`);
  }
  