[wp-trac] [WordPress Trac] #45130: Defer jQuery WordPress Admin & Customizer doesn't work properly

[WordPress Trac]

#45130: Defer jQuery WordPress Admin & Customizer doesn't work properly
----------------------------+------------------------------
 Reporter:  remzicavdar     |       Owner:  (none)
     Type:  defect (bug)    |      Status:  new
 Priority:  normal          |   Milestone:  Awaiting Review
Component:  Administration  |     Version:
 Severity:  normal          |  Resolution:
 Keywords:  needs-patch     |     Focuses:  javascript
----------------------------+------------------------------

Comment (by dlh):

 Regarding updating jQuery, it might be better to bring your suggestions to
 the discussion at #37110, where more contributors are likely to see it. (I
 was referring to backwards-compatibility just with respect to deferring
 jQuery — sorry for the confusion.)

 The checks for `is_admin()` or `is_customize_preview()` could go at the
 beginning of your `script_loader_tag` filter:

 {{{#!php
 <?php
 function add_defer_attribute( $tag, $handle ) {
         if ( is_admin() || is_customize_preview() ) {
                 return $tag;
         }

         // add script handles to the array below
         $scripts_to_defer = array(
                 'jquery',
                 'jquery-migrate',
                 'bootstrap-bundle-js'
         );

         foreach ( $scripts_to_defer as $defer_script ) {
                 if ( $defer_script === $handle ) {
                         return str_replace( ' src', ' defer="defer" src',
 $tag );
                 }
         }

         return $tag;
 }
 add_filter( 'script_loader_tag', 'add_defer_attribute', 10, 2 );
 }}}

 However, Trac isn't meant for support, so you might want to ask additional
 questions about specific implementations at the
 [https://wordpress.org/support/ support forums] or
 [https://wordpress.stackexchange.com/ WordPress Development Stack
 Exchange].

-- 
Ticket URL: <https://core.trac.wordpress.org/ticket/45130#comment:9>
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