[Pas2js] TDataset load local JSON in a async way. How?

[warleyalex]

In this example:
https://pas2js.github.io/master/ProjectFishfacts/index.html

I use TDataset which inherits from TBaseJSONDataSet to load a local JSON
file.

If you see at
https://github.com/pas2js/pas2js.github.io/blob/master/master/ProjectFishfacts/ucds.pas

It is possible to load synchronously but there is that warning:
[Deprecation] Synchronous XMLHttpRequest on the main thread is deprecated
because of its detrimental effects to the end user's experience. For more
help, check https://xhr.spec.whatwg.org/.
--> FReq.open('GET',FURI, FALSE);  // async = false

but would prefer TDataset to load asynchronously using the modern (async/
await / fetch). But unfortunately, I could not find a way. 

function fetchAsync(url: String): TJSPromise; {$ifndef
InLazIDE}async;{$endif}
var
  response: TJSResponse;
  data: TJSPromise;
begin
  response := await(window.fetch( url ));
  Result := await(response.json());
end;

Any idea how to TDataset load in a async way?







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