`async_without_await` triggers on methods which are marked with `@MainActor`
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Description
New Issue Checklist
- I've Updated SwiftLint to the latest version.
- I've searched for existing GitHub issues.
Bug Description
A method which has the @MainActor annotation also has to be marked with async, otherwise it will not run on the MainActor. This does not necessarily mean, that within the method, there is a await function call.
@MainActor
func() runOnMainActor async {
print("This runs on MainActor")
}
$ swiftlint lint
Environment
- SwiftLint version (58.2)
- Xcode version (16B40)
- Installation method used ( MacOS binary )
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start with the async_without_await rule and reproduce the report using the @MainActor async method shown in the issue. Trace how the rule detects await usage, then add a regression test showing that this method is not flagged while methods that truly omit required async behavior remain covered.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- swift
- Domain
- tooling
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 45/100