Fix broken UTC plugin due to rollup

[aloisklink]

I was playing around with using dayjs from the dev branch with #1450 and Node.JS, and I noticed that the dayjs/plugin/utc was broken, as the plugin was instead exported under the default key.

> const dayjs = require("."); const utc = require("./plugin/utc"); dayjs.extend(utc);
Uncaught TypeError: t is not a function
    at Function.v.extend (/tmp/dayjs/dayjs.min.js:1:6319)
> console.log(utc);
{
  REGEX_VALID_OFFSET_FORMAT: /[+-]\d\d(?::?\d\d)?/g,
  REGEX_OFFSET_HOURS_MINUTES_FORMAT: /([+-]|\d\d)/g,
  default: [Function]
}

It looks like Rollup does not like mixing together named exports and default exports: https://rollupjs.org/guide/en/#default-export

Updating Rollup

I updated Rollup to the latest version, which fixed an error with running npm install --dev on NPM@v7, and also added the following warning:

me@me:/tmp/dayjs$ npm run build

> dayjs@0.0.0-development build
> cross-env BABEL_ENV=build node build && npm run size

Entry module "src/plugin/utc/index.js" is using named and default exports together. Consumers of your bundle will have to use `dayjs_plugin_utc["default"]` to access the default export, which may not be what you want. Use `output.exports: "named"` to disable this warning

> dayjs@0.0.0-development size
> size-limit && gzip-size dayjs.min.js


  Package size: 2.6 KB
  Size limit:   2.99 KB
  With all dependencies, minified and gzipped

2.86 kB

The new rollup is create a gzip file that is 31 bytes larger than the old gzip size. It seems like it's mainly due to the addition of globalThis, so this should also fix #1060, but I haven't tested it.

I also changed build/index.js to run rollup sequentially, since otherwise it uses up more than 16 GB of RAM on my computer, which makes it freeze.

Fixing plugins/utc

Finally, to fix plugins/utc, I moved the two regex named exports to the constant.js file. Normally this would be a breaking change, but since there hasn't been a release since the PR that added these exports (#1395), it should be fine.

New bundle sizes

Created by running for file in {plugin/*.js,dayjs.min.js}; do echo "$file: $(npx gzip-size --raw "$file")"; done
As can be seen, all the bundles have increased in size by about 15-30 bytes (mainly due to adding globalThis), except for the utc plugin, which decreases in size since it no longer has the extra exports.

I think it's still worth it though, since the old rollup version that is being used is from 2018-03-17, so it is quite out-of-date.

file	old size	new size
plugin/advancedFormat.js	583	602
plugin/arraySupport.js	315	337
plugin/badMutable.js	387	407
plugin/buddhistEra.js	342	361
plugin/calendar.js	405	427
plugin/customParseFormat.js	1697	1729
plugin/dayOfYear.js	242	263
plugin/devHelper.js	610	631
plugin/duration.js	1586	1616
plugin/isBetween.js	273	294
plugin/isLeapYear.js	207	230
plugin/isMoment.js	184	202
plugin/isoWeek.js	461	481
plugin/isoWeeksInYear.js	234	253
plugin/isSameOrAfter.js	195	215
plugin/isSameOrBefore.js	197	218
plugin/isToday.js	212	234
plugin/isTomorrow.js	226	247
plugin/isYesterday.js	229	249
plugin/localeData.js	683	705
plugin/localizedFormat.js	435	454
plugin/minMax.js	323	343
plugin/objectSupport.js	584	613
plugin/pluralGetSet.js	264	286
plugin/preParsePostFormat.js	396	414
plugin/quarterOfYear.js	384	403
plugin/relativeTime.js	718	737
plugin/timezone.js	1051	1069
plugin/toArray.js	201	224
plugin/toObject.js	230	250
plugin/updateLocale.js	230	251
plugin/utc.js	1022	967
plugin/weekday.js	251	269
plugin/weekOfYear.js	419	440
plugin/weekYear.js	231	251
dayjs.min.js	2829	2860

[iamkun]

LGTM

[iamkun]

🎉 This PR is included in version 1.10.5 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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