What is jQuery Migrate for? Can I disable and delete it?

  • Since last week, my WP admin page started showing a red sign says “jQuery Migrate (Previously Known:2 Discovered on this page:0)”

    As it’s red and it’s in the top middle. It makes me feel like there’s an emergency that needs me to deal with. But I have absolutely no idea what action should I take. And it really bugs me.

    Does anyone here know what does that sign means? What should I do to make that sign disappear? Is jQuery Migrate a necessary plugin? What is jQuery Migrate for? Can I disable and delete it?

    Thank you for taking the time to read this!

    • This topic was modified 4 years, 4 months ago by rbkselect.
Viewing 3 replies - 1 through 3 (of 3 total)

  • Chances are if you have JQuery Migrate you need it. It enables the migration script for your site to give your plugin and theme authors some more time to update, and test, their code. However, if you are not sure why you have it installed I would suggest disabling it and checking to see if anything breaks. If nothing breaks you can delete it.

    Hope this clears things up for you.

    If you have that plugin, you should know it’s a temporary fix for the old code in theme or plugins, caused by WordPress 5.5 removing the ancient jquery-migrate script. Because this script was keeping old code working and it was removed, the jQuery Migrate Helper plugin was made so that you could get your old code fixed or find a replacement before WordPress 5.6, which will have the much newer version of jQuery and a new jquery-migrate for that newer version.
    The plugin shows obnoxious messages so that you will fix things, although it probably should be made more clear that there is a deadline and what to do about it.

    The team lead of the Support team wrote this article: https://clorith.net/updating-jquery-code-in-your-unmaintained-wordpress-plugin-or-theme/
    He also wrote the jquery Migrate Helper plugin.

    Thread Starter rbkselect

    (@rbkselect)

    Thank you for replying to my question! Although I still can’t quite understand what it is for.
    I’m too scared to disable it as I’m only at the beginning of building my WordPress website. But from both of your replies, I guess the safest way for me is to ask the theme developer to see if I should keep jQuery Migrate, right?

    Thanks to @binarywc and @joyously
    Have a wonderful weekend!

Viewing 3 replies - 1 through 3 (of 3 total)
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