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 have searched for related issues and found none that matched my issue.
• I have read the FAQ and my problem is not listed.

Playground Link

https://typescript-eslint.io/play/#ts=5.4.3&showAST=es&fileType=.tsx&code=GYewTgBAhg7lCWAXCAKAxiAdgZ2diIwEA2gOSYikA0EpiAFgKaZQBGANo9tbU2I6QC6ASggBvAL4AoRgA8ADuGRiIEoA&eslintrc=N4KABGBEBOCuA2BTAzpAXGUEKQAIBcBPABxQGNoBLY-AWhXkoDt8B6AQwHd3K78ALRE3YAjJOiiJo0APbRI4MAF8QSoA&tsconfig=N4KABGBEDGD2C2AHAlgGwKYCcDyiAuysAdgM6QBcYoEEkJemy0eAcgK6qoDCAFutAGsylBm3TgwAXxCSgA&tokens=false

Repro Code

for await (const s of ['no', 'thenables', 'here']) {}
export { }

ESLint Config

module.exports = {
  "rules": {
    "@typescript-eslint/await-thenable": "error"
  }
}

tsconfig

{
  "compilerOptions": {
    "strictNullChecks": true
  }
}

Expected Result

I expect that the first line should flag due to for await being used on something that does not have a Symbol.asyncIterator.

Actual Result

No error.

Additional Info

Note that it's unambiguous IMO that the example given should flag. However, I, personally, would also like for the rule to flag on misused for-await-of, where the iterable is a synchronous iterator over promises. That should be written as an ordinary for loop. It's only a true async iterable that should be allowed to be iterated over in a for-await-of loop.

Refresher on for-await-of: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/for-await...of