I'm trying to reduce number of requests by reducing number of JS files on WP site. I successfully combined around 7 javascript files into one (site.js). Now, I'm using a plugin which has its own JS file (pluginA.js), I want to include (pluginA.js) in that site.js. However, if I simply copy pluginA JS content to site.js and then change location to /files/site.js, firebug's NET tab shows that site.js is requested/called twice. I presume this is due to wp_enqueue_script.

How can I make it not call site.js second time but just look into already loaded site.js? Maybe there's alternative to wp_enqueue_script?

Plugin's php file:

add_action( 'wp_enqueue_scripts', 'testplugin_scripts');
    function testplugin_scripts() {
        /*global $testplugin_version; */
            $default_selector = 'li:has(ul) > a';
            $default_selector_leaf = 'li li li:not(:has(ul)) > a';
       wp_enqueue_scripts('test-plugin', site_url('/files/site.js', __FILE__), array('jquery'), $testplugin_version);
            $params = array(
                    'selector' => apply_filters('testplugin_selector', $default_selector),
                    'selector_leaf' => apply_filters('testplugin_selector_leaf', $default_selector_leaf)
            );
            wp_localize_script('test-plugin', 'testplugin_params', $params);
    }