Update moment.js lib to its latest version

[yoancutillas]

Hello,

The core-bundled momentjs library hasn't been updated in two years (2.22.2 - Jun 1, 2018).

JQMigrate displays a deprecation warning:

Deprecation warning: use moment.updateLocale(localeName, config) to change an existing locale. moment.defineLocale(localeName, config) should only be used for creating a new locale See http://momentjs.com/guides/#/warnings/define-locale/ for more info.

And some plugins and themes encounter javascript fatal errors (blocking) because of it:

• ​https://wordpress.org/support/topic/cannot-edit-calendar-or-activities/
• ​https://wordpress.org/support/topic/moment-js-integration-conflict/
• ​https://wordpress.org/support/topic/minified-moment-js-library-causes-conflict-with-the-events-calendar-plugin/
• ​https://wordpress.org/support/topic/calendar-not-loading-9/

Is it possible to update momentjs to its latest version (currently 2.26.0 - May 20, 2020)?

wp-includes\js\dist\vendor\moment.js
wp-includes\js\dist\vendor\moment.min.js

[SergeyBiryukov]

In 48075:

External Libraries: Update Moment.js to 2.26.0.

Changelog: ​https://github.com/moment/moment/compare/2.22.2...2.26.0

This commit also fixes a deprecation warning regarding the usage of moment.locale() to set locale properties.

As of Moment.js 2.12.0, moment.locale() is deprecated and moment.updateLocale() should be used instead.

Additionally, minimize moment.js as part of build process to remove the source map reference.

This avoids a sourceMappingURL being in the minified file, as we don't ship source maps.

Props yoancutillas, SergeyBiryukov.
Fixes #50408.

[desrosj]

This was noted in the following dev note: ​https://make.wordpress.org/core/2020/07/01/external-library-updates-in-wordpress-5-5-call-for-testing/

[Hareesh Pillai]

There was a new version (​v2.27.0) of moment.js released two weeks ago. Let us try to update to this version before the beta.

[desrosj]

Thanks @hareesh-pillai!

[desrosj]

In 48269:

External Libraries: Update Moment.js to version 2.27.0.

A full list of changes in this update can be found on GitHub: ​https://github.com/moment/moment/compare/2.26.0...2.27.0

Props hareesh-pillai, desrosj.
Previously [48075].
Fixes #50408.