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Describe the enhancement While using the UpdateLocale Plugin, it isn't possible to just update one single value in a nested value. For example I just want to update the format.L value:

dayjs.extend(UpdateLocale);
dayjs.updateLocale('de', {
  formats: {
    L: 'D.M.YYYY',
  },
});

Like this other formats LL, LLL, ... are getting lost.

Expected behavior I want to pass in an object, which updates the locale information partially.

Information

• Day.js Version [e.g. v1.9.1]
• OS: [e.g. iOS]

PS:
If the issue is accepted as a bug/enhancement, I would like to contribute and create a PR for that issue 😃

Agreed. Will update this feature later.

The issue still persists with version "1.11.4". updateLocal drops all other keys from the object.

My workaround:

const relativeTime = {
  relativeTime: {
    ...dayjs.Ls[nextLocale].relativeTime,
    future: "custom text",
    past: "custom text"
  } 
};
dayjs.updateLocale(nextLocale, relativeTime);

Trying to fix here https://github.com/iamkun/dayjs/pull/2075 @iamkun