JS: Formatting weekday with @js-joda/locale_de-de

According to the docs it should be possible to format a ZonedDateTime with a weekday in several languages:

I try to show the weekday, for example Montag, Dienstag, …

rules.JSRule({
  name: "JS test rule",
  description:
    "module /opt/openhab/conf/automation/js/node_modules/@js-joda/locale_de-de/dist/js-joda-locale",
  triggers: [triggers.ItemStateChangeTrigger("Test3_Switch", "ON")],
  execute: (event) => {
    let Locale = require("@js-joda/locale_de-de").Locale.GERMAN;
    let formatter = time.DateTimeFormatter.ofPattern(
      "EEEE, dd.MM.yyyy HH:mm"
    ).withLocale(Locale);
    let result = formatter.format(time.ZonedDateTime.now());
    console.debug("result=" + result);
  },
  tags: [],
});

It gives me an error:

2025-01-23 20:32:01.474 [ERROR] [org.openhab.extra.test.js           ] - Failed to execute rule JS-test-rule-58777b4c-f706-4e58-bbd9-b2449fffc7ea: IllegalArgumentException: Pattern using (localized) text not implemented, use @js-joda/locale plugin!: IllegalArgumentException: Pattern using (localized) text not implemented, use @js-joda/locale plugin!
	at i (@openhab-globals.js:2)
	at appendText (@openhab-globals.js:2)
	at _parseField (@openhab-globals.js:2)
	at _parsePattern (@openhab-globals.js:2)
	at appendPattern (@openhab-globals.js:2)
	at ofPattern (@openhab-globals.js:2)
	at execute (test.js:15)
	at execute (@openhab-globals.js:2)

npm is installed, so is the locale via npm install @js-joda/locale_de-de:

sihui@openhab:/opt/openhab/conf/automation/js/node_modules/@js-joda/locale_de-de/dist$ ls -l
insgesamt 1380
-rw-r--r-- 1 openhab openhab 328271 20. Jan 15:00 index.esm.js
-rw-r--r-- 1 openhab openhab 263014 20. Jan 15:00 index.esm.js.map
-rw-r--r-- 1 openhab openhab 359050 20. Jan 15:00 index.js
-rw-r--r-- 1 openhab openhab 263104 20. Jan 15:00 index.js.map
-rw-r--r-- 1 openhab openhab 180615 20. Jan 15:00 index.min.js
-rw-r--r-- 1 openhab openhab   2328 20. Jan 15:00 js-joda-locale.d.ts

I’m scratching my head since hours …

It looks like this issue was already mentioned before:

and an issue has been opened:

Workaround:

const weekday = [
      "Sonntag",
      "Montag",
      "Dienstag",
      "Mittwoch",
      "Donnerstag",
      "Freitag",
      "Samstag",
    ];
    const date = new Date();
    let wday = weekday[date.getDay()];
    console.debug("weekday=" + wday);

2025-01-24 09:57:53.389 [DEBUG] [org.openhab.extra.test.js ] - weekday=Freitag