Re: [w3c/ServiceWorker] [BUG] setTimeout/setInterval mix with importScripts leads to DOMExeption (#1580)

> ### Scenario
> 
> Try to make HMR work inside service worker. 
> 
> Dynamic reload webpack generated "/a.hashid.js".
> 
> Found DOMExeption.
> 
> 
> 
> ###  Code that boom
> 
> ```sh
> 
> $ cat a.js 
> 
> console.log(42);
> 
> $ cat serviceWorker.js
> 
> ```
> 
> ```js
> 
> // importScripts('/a.hashid.js'); 
> 
> 
> 
> // (()=>{
> 
> //        importScripts('/a.hashid.js');
> 
> // })();
> 
> 
> 
> setTimeout(()=>{
> 
>         importScripts('/a.hashid.js'); 
> 
> }, 1000);
> 
> 
> 
> setInterval(()=>{
> 
>         importScripts('/a.hashid.js'); 
> 
> }, 1000);
> 
> ```
> 
> 
> 
> ### Actual Output
> 
> ```txt
> 
> Uncaught DOMException: Failed to execute 'importScripts' on 'WorkerGlobalScope': The script at '<foobar>/a.js' failed to load.
> 
>     at <foobar>/serviceWorker.js
> 
> ```
> 
> ### Expected Output
> 
> ```txt
> 
> 42
> 
> 42
> 
> 42
> 
> 42
> 
> 42
> 
> ...
> 
> ```
> 
> ###  Code that works
> 
> ```sh
> 
> $ cat a.js 
> 
> console.log(42);
> 
> $ cat serviceWorker.js 
> 
> ```
> 
> ```js
> 
> importScripts('/a.js'); 
> 
> 
> 
> (()=>{
> 
>        importScripts('/a.js');
> 
> })();
> 
> 
> 
> setTimeout(()=>{
> 
>         importScripts('/a.js'); 
> 
> }, 1000);
> 
> 
> 
> setInterval(()=>{
> 
>         importScripts('/a.js'); 
> 
> }, 1000);
> 
> ```
> 
> output:
> 
> ```txt
> 
> 42
> 
> 42
> 
> 42
> 
> 42
> 
> 42
> 
> ...
> 
> ```
> 
> 
> 
> ### Maybe
> 
> [issue838](https://github.com/w3c/ServiceWorker/issues/838) maybe related?
> 
> "setTimeout/setInterval are unreliable in ServiceWorker"
> 
> 
> 
> Not quite sure whether it is a bug or a feature, seems firefrox and chrome both fail.
> 
> Hope it is the right place to fire this issue. :)



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