# no-useless-parameters

Reject common XPCOM methods called with useless optional parameters (eg.
`Services.io.newURI(url, null, null)`, or non-existent parameters (eg.
`Services.obs.removeObserver(name, observer, false)`).

This option can be autofixed (`--fix`).

## Examples of incorrect code for this rule

```js
elt.addEventListener('click', handler, false);
Services.io.newURI('http://example.com', null, null);
Services.obs.notifyObservers(obj, 'topic', null);
```

## Examples of correct code for this rule

```js
elt.addEventListener('click', handler);
Services.io.newURI('http://example.com');
Services.obs.notifyObservers(obj, 'topic');
```