public LightMethodBuilder setMethodReturnType(final @NlsSafe @NotNull String returnType) {
    return setMethodReturnType(NotNullLazyValue.lazy(
      () -> JavaPsiFacade.getElementFactory(getProject()).createTypeByFQClassName(returnType, getResolveScope()))::getValue);
  }
public LightMethodBuilder setMethodReturnType(final @NlsSafe @NotNull String returnType)