[regression] Custom translation not working when using a single non-root locale on MacOS

[Fryuni]

What version of starlight are you using?

main

What version of astro are you using?

4.8.2

What package manager are you using?

pnpm

What operating system are you using?

Mac

What browser are you using?

N/A

Describe the Bug

Custom translations are not being applied when using a single non-root locale on MacOS. Calls to useTranslation result in the default translations being used.

Link to Minimal Reproducible Example

starlight/packages/starlight/__tests__/i18n-non-root-single-locale/translations.test.ts

Lines 11 to 23 in 0e4d04e

	describe('useTranslations()', () => {
	test('works when no i18n collection is available', () => {
	const t = useTranslations('fr');
	expect(t).toBeTypeOf('function');
	expect(t('page.editLink')).toBe(translations.fr?.['page.editLink']);
	});
	test('returns default locale for unknown language', () => {
	const locale = 'xx';
	expect(translations).not.toHaveProperty(locale);
	const t = useTranslations(locale);
	expect(t('page.editLink')).toBe(translations.fr?.['page.editLink']);
	});

Participation

• I am willing to submit a pull request for this issue.

[Fryuni]

I can send a PR, just don't have time to investigate this in the near future. If someone else wants to do it before me, be my guest :)

[delucis]

Coming back to this @Fryuni, did you say you also tested on other operating systems? And this is macOS-specific?

I’m not sure I follow how the test you linked to reproduces this — it’s passing for me? Or are you saying the test is wrong?

[HiDeoo]

To add a bit more context, I tried to repro on Discord but did not manage to hit the same issue on macOS:

[Fryuni]

Tried to run again and it is no longer breaking. Went back to what I was doing in another branch and it failed there. Switching to main again continues to fail, so it seems just pnpm is getting confused with the install from both branches.

Cleaning the repo before installing dependencies makes it work.

Sorry guys, false alarm. Weird that it only happens on Mac tho

[delucis]

Oh, cool! Well, thanks for checking again.

Fingers crossed this macghOSt doesn’t come back 👻