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=5.9.3&fileType=.tsx&code=GYVwdgxgLglg9mABAWxFAhlApgCjgB1gQGcB%2BALkQG9EEBlECCLY4nASkoDc4YATRAF921AFCJEAekmIAUiGJREfOInRgAnlAAWMMAHNEAdxg7aheGGKIoq5OgDWWRABUN%2BLHQgAnGIUTa6Pj4GgB04ogQJHAANlihMXD6eBYk7ADcooKiotKuutb6WFDW3lj4cN7YfOGoGNg4NPSMzKyU6MQakIgciAC8AHzUQkLsOXkuBcpwLIhgcFC1aJi4NB1dELRgDEwsbCI0gqOiQA&eslintrc=N4KABGBEBOCuA2BTAzpAXGUEKQAIBcBPABxQGNoBLY-AWhXkoDt8B6Jge1oFtLlZkiACa1i0Dr0GoMkRNHHRI4MAF8QKoA&tsconfig=N4KABGBEDGD2C2AHAlgGwKYCcDyiAuysAdgM6QBcYoEEkJemy0eFYDAruuGAL4g9A&tokens=false

Repro Code

functionmutate(options?:{onSuccess():void}){// Just do anything with options to make TypeScript happy.console.log(options);}// This gets reported:mutate({onSuccess:async()=>{}})// This does not:mutate({asynconSuccess(){}})

ESLint Config

{"rules":{"@typescript-eslint/no-misused-promises":"error"}}

tsconfig

{"compilerOptions": {"strict":true  }}

(strict is turned on by default, so you don't actually need to set it to reproduce the behaviour. I just added it so it's easier to test the repro by setting it tofalse.)

Expected Result

I expected the rule to report a misused promise for both declaration styles.

I didnot expect TypeScript'sstrict compiler option to change the rule's behaviour.

Actual Result

The rule only reports theonSuccess: async () => { … } case.

Additional Info

I understand that the two styles of declaring the options object are not completely interchangeable, but I still think it's weird enough to deserve a bug report 😄

Note that this behaviouronly triggers when theoptions argument is marked optional. Declaring the function asfunction mutate(options: { … }) { … } (i.e., notoptions?: { …}) causes the rule to report the misused promise.