no-useless-parameters.rst

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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:

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.. code-block:: 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:

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.. code-block:: js

    elt.addEventListener('click', handler);

    Services.io.newURI('http://example.com');

    Services.obs.notifyObservers(obj, 'topic');