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# 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.obs.notifyObservers(obj, 'topic', null);
```
## Examples of correct code for this rule
```js
elt.addEventListener('click', handler);
Services.obs.notifyObservers(obj, 'topic');
```