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How to add javascript after form was validated with ajax callback?

I created a simple form. How could I add JavaScript commands after form was validated? Why is it so hard do this?

$form['submit'] = array(   '#type' => 'submit',   '#value' => 'submit',   '#validate' => 'my_validate_callback',   '#ajax' => array(     'callback' => 'my_form_callback',     'method' => 'replace',     'wrapper' => 'form-wrap',     'effect' => 'fade'   ) );
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How to add javascript after form was validated with ajax callback?

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