Before You File a Proposal Please Confirm You Have Done The Following...

• I have searched for related issues and found none that match my proposal.
• I have searched the current rule list and found no rules that match my proposal.
• I have read the FAQ and my problem is not listed.

My proposal is suitable for this project

• I believe my proposal would be useful to the broader TypeScript community (meaning it is not a niche proposal).

Link to the rule's documentation

https://typescript-eslint.io/rules/no-misused-promises/

Description

I would like the rule to add a few checks for misused promises involved in explicit resource management code. This is split out from #10208 (comment)

Fail

// rule does not inspect variable for misused promise-returning functions
const a = {
    async [Symbol.dispose]() {}
} 
const b: Disposable = a;
//                    ~ <-- expected report here.


// `using` statement without explicit type
using c = {
    async [Symbol.dispose]() {}
//  ~~~~~~~~~~~~~~~~~~~~~~ <-- expected report here.
};

// combination of both of the above
const d = {
    async [Symbol.dispose]() {}
} 
using e = d;
//        ~ <-- expected report here.

Pass

// just a sync disposable
using a = {
    [Symbol.dispose]() {}
}

// proper use of await using (note `Symbol.asyncDispose`)
await using b = {
    async [Symbol.asyncDispose]() {}
}

Additional Info

Note that the upcoming strict-void-return aims to be a superset of no-misused-promises, so perhaps this check will make sense to add there also, see #9707