message: refactor(elements): add accessor workaround for build-optimizer
  Build-optimizer currently uses TypeScript 3.6 which is unable to resolve an 'accessor' in 'getTypeOfVariableOrParameterOrPropertyWorker'.
  Unfortunately, in Build optimizer we cannot update the version of TypeScript because of
  PR Close
diff: @@ -213,7 +213,11 @@ export function createCustomElement<P>(
  // compliance with the spec). This breaks emulated inheritance in ES5 on environments that do not
  // natively support `Object.setPrototypeOf()` (such as IE 9-10).
  // Update the property descriptor of `NgElementImpl#ngElementStrategy` to make it enumerable.
  - Object.defineProperty(NgElementImpl.prototype, 'ngElementStrategy', {enumerable: true});
  + // The below 'const', shouldn't be needed but currently this breaks build-optimizer
  + // Build-optimizer currently uses TypeScript 3.6 which is unable to resolve an 'accessor'
  + // in 'getTypeOfVariableOrParameterOrPropertyWorker'.
  + const getterName = 'ngElementStrategy';
  + Object.defineProperty(NgElementImpl.prototype, getterName, {enumerable: true});
  // Add getters and setters to the prototype for each property input.
  defineInputGettersSetters(inputs, NgElementImpl.prototype);
  