Lint / IDE warning if async function is called without await

[lewinpauli]

I think it would help a lot if the IDE or linter would highlight if a async function is called without a await. This could prevent some simple mistakes.

[lrhn]

There is a lint for that: unawaited_futures.

The lint is in the recommended lint set, so it should be enabled for all new projects created using dart create.
It only reports such calls in asynchronous functions (where you could add await). There is no corresponding lint for calling an asynchronous function from a synchronous function.

(There is a much stricter lint, discarded_futures which say you just can't call asynchronous functions from a synchronous function, you must convert the containing funtion to async. A little too strict to recommend, and often a source of confusion from people who think it is the synchronous version of unawaited_futures, partly because of the name being a little misleading.)

[lewinpauli]

thank you for that!! just finding future methods where im not using await :)

its also good integrated into vscode

documentation:
unawaited_futures

[lewinpauli]

Could unawaited_futures not be activated by default 🤔
should also not break any code

[lrhn]

The lint is activated by default in all projects created using dart create. It's a lint, it can be disabled if you want to, but it's intended to be on by default.
If you don't use dart create to create your project, or your project is older than the lints package, the lint may not be enabled for you.

[lewinpauli]

Good to know, additionally it would be nice if flutter would have this by default... But here is probably the wrong place for that request

[lrhn]

I'm pretty sure flutter create also has the Flutter lints enabled, which includes the Dart recommended lints.

[lewinpauli]

Thanks for the link of the recommended lints in dart @lrhn, but unawaited_futures seems to be missing.

In flutter stable 3.24.4 the lint of unawaited_futures only appears if manually added

[lrhn]

Ack, my bad. It has been the intent to add the lint to the recommended set for so long that I've forgotten that it hasn't actually been added.
The issue for adding it is dart-lang/core#742