perf: use shallowRef server-side for datetimeFormats

[BobbieGoede]

Looks like I forgot this line in #1677

Summary by CodeRabbit

• Refactor
  • Internal improvements to the datetime formats initialization in the lite build path to maintain consistency with other build variants.

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[coderabbitai]

Walkthrough

The composer's _datetimeFormats construction in the lite path is refactored to use the shared _ref helper instead of a direct ref call, ensuring consistency across lite and non-lite branches without altering behavior.

Changes

Cohort / File(s)	Summary
Lite path refactoring packages/vue-i18n-core/src/composer.ts	Switches _datetimeFormats initialization from direct ref<DateTimeFormatsType>({}) to _ref<DateTimeFormatsType>({}) for consistency with non-lite paths

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

• Single-file, mechanical refactoring with no logic or control flow changes
• Direct substitution of one reactive constructor for another shared helper
• No risk of behavioral regression due to alignment with existing patterns

Poem

🐰 A tiny hop through code so neat,
Where refs align in rhythm sweet,
Lite and full now dance as one,
Consistency—our day is done! 🌟

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: switching to shallowRef for datetimeFormats in the server-side/lite path, which aligns with the actual code modification.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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📜 Recent review details

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Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between c169d1b and e89bc09.

📒 Files selected for processing (1)

• packages/vue-i18n-core/src/composer.ts (1 hunks)

⏰ Context from checks skipped due to timeout of 90000ms. You can increase the timeout in your CodeRabbit configuration to a maximum of 15 minutes (900000ms). (8)

• GitHub Check: E2E test for rolldown build (ubuntu-latest, 20)
• GitHub Check: E2E test for rolldown build (ubuntu-latest, 22)
• GitHub Check: E2E test for rolldown build (macos-latest, 24)
• GitHub Check: E2E test for rolldown build (macos-latest, 20)
• GitHub Check: E2E test for rolldown build (macos-latest, 22)
• GitHub Check: E2E test for rolldown build (ubuntu-latest, 24)
• GitHub Check: release
• GitHub Check: upload

🔇 Additional comments (1)

packages/vue-i18n-core/src/composer.ts (1)

1975-1975: LGTM! Consistent use of _ref helper.

The change correctly uses the _ref helper instead of a direct ref call, ensuring shallowRef is used server-side for better performance. This aligns the lite path with the non-lite path (line 1970) and other reactive state initialization patterns in the codebase (e.g., _messages at line 1964, _numberFormats at line 1984).

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[github-actions]

Size Report

Bundles

File	Size	Gzip	Brotli
core.esm-browser.prod.js	42.91 kB	12.56 kB	11.24 kB
core.global.prod.js	33.56 kB	11.34 kB	10.22 kB
core.runtime.esm-browser.prod.js	27.19 kB	8.37 kB	7.51 kB
core.runtime.global.prod.js	20.13 kB	7.57 kB	6.80 kB
message-compiler.esm-browser.prod.js	21.75 kB	6.32 kB	5.66 kB
message-compiler.global.prod.js	19.48 kB	6.14 kB	5.53 kB
petite-vue-i18n-core.esm-browser.prod.js	23.49 kB	7.57 kB	6.80 kB
petite-vue-i18n-core.global.prod.js	17.14 kB	6.48 kB	5.87 kB
petite-vue-i18n.esm-browser.prod.js	41.72 kB	12.34 kB	11.07 kB
petite-vue-i18n.global.prod.js	32.22 kB	10.72 kB	9.74 kB
petite-vue-i18n.runtime.esm-browser.prod.js	25.85 kB	8.07 kB	7.29 kB
petite-vue-i18n.runtime.global.prod.js	18.80 kB	6.94 kB	6.31 kB
vue-i18n.esm-browser.prod.js	55.37 kB	16.02 kB	14.37 kB
vue-i18n.global.prod.js	42.66 kB	14.03 kB	12.71 kB
vue-i18n.runtime.esm-browser.prod.js	39.49 kB	11.76 kB	10.60 kB
vue-i18n.runtime.global.prod.js	29.23 kB	10.27 kB	9.30 kB

Usages

Name	Size	Gzip	Brotli
packages/size-check-core (@intlify/core)	12.18 kB	4.77 kB	4.29 kB
packages/size-check-petite-vue-i18n (petite-vue-i18n)	83.98 kB	32.15 kB	28.95 kB
packages/size-check-vue-i18n (vue-i18n)	89.11 kB	33.62 kB	30.19 kB

[pkg-pr-new]

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@intlify/core-base

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petite-vue-i18n

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@intlify/shared

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vue-i18n

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@intlify/vue-i18n-core

npm i https://pkg.pr.new/@intlify/vue-i18n-core@2333

commit: e89bc09

[kazupon]

Thanks!
LGTM!
CI is still failing, but that cause is occured by #2286
I'll merge this PR!