[wp-trac] [WordPress Trac] #42720: Remove unnecessary MediaElement.js files

[WordPress Trac]

#42720: Remove unnecessary MediaElement.js files
----------------------------+-----------------
 Reporter:  SergeyBiryukov  |      Owner:
     Type:  enhancement     |     Status:  new
 Priority:  normal          |  Milestone:  5.0
Component:  Media           |    Version:  4.9
 Severity:  normal          |   Keywords:
  Focuses:                  |
----------------------------+-----------------
 Looking at the recent MediaElement.js upgrades in [41198], [41240],
 [41877], its directory size has grown almost 6 times (!) from ~289 KB in
 4.8.x to ~1600 KB in 4.9. I think we can remove some redundant files
 there.

 In 4.8.x:
 * `lang` directory was not included, as WordPress uses its own
 translations.
 * Only `mediaelement-and-player.js` was included, and only in minified
 form:
 {{{
 mediaelementplayer.min.css
 mediaelement-and-player.min.js
 }}}
 * WP files were included in both minified and non-minified form:
 {{{
 wp-mediaelement.css
 wp-mediaelement.min.css
 wp-mediaelement.js
 wp-mediaelement.min.js
 wp-playlist.js
 wp-playlist.min.js
 }}}

 In 4.9:
 * `lang` directory is included, despite WordPress using its own
 translations.
 * `mediaelement.js` and  `mediaelement-and-player.js` are included, both
 in non-minified and minified form:
 {{{
 mediaelementplayer.css
 mediaelementplayer.min.css
 mediaelement-and-player.js
 mediaelement-and-player.min.js
 mediaelement.js
 mediaelement.min.js
 }}}
 * WP files are only included in non-minified form:
 {{{
 wp-mediaelement.css
 wp-mediaelement.js
 wp-playlist.js
 }}}
 * Legacy CSS files are included, both in minified and non-minified form:
 {{{
 mediaelementplayer-legacy.css
 mediaelementplayer-legacy.min.css
 }}}
 * Five renderers are included, both in minified and non-minified form, of
 which only `vimeo.min.js` is used:
 {{{
 dailymotion.js
 dailymotion.min.js
 facebook.js
 facebook.min.js
 soundcloud.js
 soundcloud.min.js
 twitch.js
 twitch.min.js
 vimeo.js
 vimeo.min.js
 }}}

 Suggestions:
 * Remove the `lang` directory.
 * Remove `mediaelementplayer.css`, `mediaelement(.min).js`, and
 `mediaelement-and-player.js`. Keep `mediaelementplayer.min.css` and
 `mediaelement-and-player.min.js`.
 * Include WP files in minified form as well.
 * Do we need the legacy CSS files? If yes, remove `mediaelementplayer-
 legacy.css`, keep `mediaelementplayer-legacy.min.css`, which is the only
 one used anyway.
 * Do we need all the renderers? If yes, remove non-minified files, keep
 minified ones.

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Ticket URL: <https://core.trac.wordpress.org/ticket/42720>
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