I've seen the following pattern in code several times now, and it leads to some confusion:

function doSomething(): void {
    // Returns nothing
}

const result = await myPromise.then(() => {
    return doSomething();
});

The bottom statement suggests that a value is being returned from doSomething(), while in reality its type is void.

It would be great to have a rule that enforces removing this misleading return keyword:

const result = await myPromise.then(() => {
    doSomething();
});

This code style removes the suggestion that result will be anything other than void / undefined.

I think this rule is a good fit for @typescript-eslint/eslint-plugin because it must know about the return type of the called function.