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Bug: await-thenable doesn't handle unions cleanly in for-await [8.8.0 regression] #10080

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accepting prsGo ahead, send a pull request that resolves this issuebugSomething isn't workinglocked due to agePlease open a new issue if you'd like to say more. See https://typescript-eslint.io/contributing.package: eslint-pluginIssues related to @typescript-eslint/eslint-plugin
@JavaScriptBach

Description

@JavaScriptBach

Before You File a Bug Report Please Confirm You Have Done The Following...

  • I have tried restarting my IDE and the issue persists.
  • I have updated to the latest version of the packages.
  • I havesearched for related issues and found none that matched my issue.
  • I haveread the FAQ and my problem is not listed.

Playground Link

https://typescript-eslint.io/play/#ts=5.4.3&showAST=es&fileType=.tsx&code=MYewdgzgLgBAhhAnmYBJKBTATgLhgQSRXWzgCMAbDAHmiwEswBzAPhgB8YStyraoGzNgF4YAbQC6AbgBQAMxBZ4Adzj1YAClCRYEGCDnwiaTFgCUMAN4wAvjIwAPAA6LY1m0A&eslintrc=N4KABGBEBOCuA2BTAzpAXGUEKQAIBcBPABxQGNoBLY-AWhXkoDt8B6AQwHd3K78ALRE3YAjJOiiJo0APbRI4MAF8QSoA&tsconfig=N4KABGBEDGD2C2AHAlgGwKYCcDyiAuysAdgM6QBcYoEEkJemy0eAcgK6qoDCAFutAGsylBm3TgwAXxCSgA&tokens=false

Repro Code

constasyncIter:AsyncIterable<string>|Iterable<string>=[];forawait(constsofasyncIter){}export{}

ESLint Config

Seeplayground

tsconfig

{"compilerOptions": {// ...  }}

Expected Result

If I callfor await on an iterator that is typed asAsyncIterable<string> | Iterable<string>, I expect one of the following to happen:

  1. No lint error, because the code is arguably correct (for await works on both sync and async iterables)
  2. Lint error but no autofix, because the code is arguably ugly (taking a union of sync and async iterables leads to unnecessary promises being created, which is the whole point of this rule), but it's not safe to remove theawait because that would introduce a code bug.

Actual Result

Lint error, with an unsafe autofix suggesting to remove theawait.

Additional Info

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    accepting prsGo ahead, send a pull request that resolves this issuebugSomething isn't workinglocked due to agePlease open a new issue if you'd like to say more. See https://typescript-eslint.io/contributing.package: eslint-pluginIssues related to @typescript-eslint/eslint-plugin

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