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(function( $ ) {
 
    "use strict";
     
    // javascript code here. i.e.: $(document).ready( function(){} ); 
 
})(jQuery);

/**
 * PLUGIN
 * Enqueue scripts and styles - for all admin pages.
 */
function plugin_name_scripts()
{
    wp_enqueue_style('bootstrap', '//maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css', false, '1.0.0');
    wp_enqueue_script('jquery', '//ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js', array(), '1.0.0', true);
    wp_enqueue_script('bootstrap-js', '//maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js', array(), '1.0.0', true);
    // wp_enqueue_style( 'style-name', get_stylesheet_uri() );
    // wp_enqueue_script('script-name', get_template_directory_uri() . '/js/example.js', array(), '1.0.0', true);
}
add_action('admin_enqueue_scripts', 'plugin_name_scripts');


/**
 * PLUGIN
 * Enqueue scripts and styles - for specific admin pages.
 */
function plugin_name_scripts($hook)
{
    // debug_console('HOOK-> ' . $hook);

    if ('toplevel_page_kcq_manual' != $hook) {
        return;
    }
    wp_enqueue_style('bootstrap', '//maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css', false, '1.0.0');
    wp_enqueue_script('jquery', '//ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js', array(), '1.0.0', true);
    wp_enqueue_script('bootstrap-js', '//maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js', array(), '1.0.0', true);
    // wp_enqueue_style( 'style-name', get_stylesheet_uri() );
    // wp_enqueue_script('script-name', get_template_directory_uri() . '/js/example.js', ['jquery'], '1.0.0', true);
}
add_action('admin_enqueue_scripts', 'plugin_name_scripts');



/**
 * New Page admin page
 * Enqueue scripts and styles
 */ 
 
function add_new_page_script($hook) {
    if ( $hook == "post-new.php" && isset($_GET['post_type']) && $_GET['post_type'] == "page" )
    {
        $pluginPrefix = "my-prefix";
        wp_enqueue_script( "{$pluginPrefix}main-js", plugins_url('assets/js/main.js'), ['jquery'] );
    }
}
add_action( 'admin_enqueue_scripts', 'add_new_page_script' );




/**
 * THEME
 * Enqueue scripts and styles
 */ 
 
 add_action( 'admin_enqueue_scripts', function($hook) {
    $pluginPrefix = "my-prefix";
    wp_enqueue_script( "{$pluginPrefix}main-js", plugins_url('assets/js/main.js'), ['jquery'] );
} );


/**
 * THEME
 * Enqueue scripts and styles - only homepage
 */ 
 
 add_action( 'admin_enqueue_scripts', function($hook) {
    if (!is_home())
        return;
     
    //if ( !is_page('about'))
    //    return;
     
    $pluginPrefix = "my-prefix";
    wp_enqueue_script( "{$pluginPrefix}main-js", plugins_url('assets/js/main.js'), ['jquery'] );
} );

/**
 * Never worry about cache again!
 */
function my_load_scripts($hook) {
 
    // create my own version codes
    $my_js_ver  = date("ymd-Gis", filemtime( plugin_dir_path( __FILE__ ) . 'js/custom.js' ));
    $my_css_ver = date("ymd-Gis", filemtime( plugin_dir_path( __FILE__ ) . 'style.css' ));
     
    // 
    wp_enqueue_script( 'custom_js', plugins_url( 'js/custom.js', __FILE__ ), array(), $my_js_ver );
    wp_register_style( 'my_css',    plugins_url( 'style.css',    __FILE__ ), false,   $my_css_ver );
    wp_enqueue_style ( 'my_css' );
 
}
add_action('wp_enqueue_scripts', 'my_load_scripts');


/* REMOVE Unnecessary scripts
https://www.sitepoint.com/enqueuing-scripts-styles-wordpress/
*/
add_action( 'admin_enqueue_scripts', function($hook) {
    $unautorized_styles = [
        'script1',
        'another-script'
    ];

    foreach ( $unautorized_styles as $handle )
    {
        wp_deregister_style( $handle );
    }

    // enqueue my scripts
} );