`Queue.push` return type should be `Promise<void> | void`, not just `void`

[SishaarRao]

In the documentation for queue, it is stated that the anonymous function pushed to the queue can return a promise. However, if you look at the definition for QueueWorker, it has a return type of just void

export interface QueueWorker {
    (callback?: QueueWorkerCallback): void;

This causes a failure by the ESLint rule no-misused-promises

Promise returned in function argument where a void return was expected  @typescript-eslint/no-misused-promises

This type definition should be updated to be Promise<void> | void