Dart Future.wait for multiple futures and get back results of different types

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You need to adapt each of your Future<T>s to a common type of Future. You could use Future<void> and assign the results instead of relying on return values:

late List<Foo> foos;
late List<Bar> bars;
late List<FooBars> foobars;

await Future.wait<void>([
  downloader.getFoos().then((result) => foos = result),
  downloader.getBars().then((result) => bars = result),
  downloader.getFooBars().then((result) => foobars = result),
]);

processData(foos, bars, foobars);

Or if you prefer await to .then(), the Future.wait call could be:

await Future.wait<void>([
  (() async => foos = await downloader.getFoos())(),
  (() async => bars = await downloader.getBars())(),
  (() async => foobars = await downloader.getFooBars())(),
]);

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