Fortunately there are other ways of observing China, from their borders specifically. Trade statistics between the Middle Kingdom and the US is actually reported and available from US sources. The story they tell show of slowing trade between the countries in both directions.
|Year over year % change of 3 month average
Source: Federal Reserve
Right now the story is also one of declining growth of trade in both directions.
Of course trade partners may and will shift their vendors around from country to country so this data should be looked at with some large error bars on the data, but this slowdown is something to keep an eye on as a coincident/lagging indicator of each countries economic trajectory.