refactor: extract shared compiler options resolution logic

[Zakir176]

Removes code duplication between runtime-core and server-renderer by introducing a shared getResolvedCompilerOptions helper. This addresses a TODO in ssrCompile.ts and improves maintainability.

Summary by CodeRabbit

• Refactor
  • Consolidated and reused internal compiler-options resolution logic across runtime and server rendering. This improves internal consistency and maintainability of template compilation paths (including SSR) while preserving existing behavior. No user-visible changes or behavioral impacts.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 76fb8ac6-a2f6-4f70-8b54-f66c5ce08b9d

📥 Commits

Reviewing files that changed from the base of the PR and between 62bac64 and 5df2d8b.

📒 Files selected for processing (2)

• packages/runtime-core/src/component.ts
• packages/runtime-core/src/index.ts

✅ Files skipped from review due to trivial changes (1)

• packages/runtime-core/src/index.ts

🚧 Files skipped from review as they are similar to previous changes (1)

• packages/runtime-core/src/component.ts

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📝 Walkthrough

Walkthrough

Centralized compiler option resolution into a new helper getResolvedCompilerOptions(instance) and exported it via SSR utilities; server-side compilation (ssrCompile) now uses this helper instead of inlined option merging.

Changes

Cohort / File(s)	Summary
Compiler Options Helper packages/runtime-core/src/component.ts, packages/runtime-core/src/index.ts	Added getResolvedCompilerOptions(instance) to compute/merge compiler options from appContext.config and component-level options; exported through _ssrUtils/ssrUtils.
SSR Compilation packages/server-renderer/src/helpers/ssrCompile.ts	Replaced manual extraction/merging of compiler options with a call to ssrUtils.getResolvedCompilerOptions(instance) when deriving finalCompilerOptions; existing mutation and compile flow unchanged.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

🐇 I hopped through options, bits all astray,
Gathered them neatly, in one tidy way,
From app and component I stitched every part,
Now ssr compiles with a happier heart,
A carrot for progress, and code that's smart.

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 33.33% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The pull request title clearly and concisely summarizes the main change: extracting shared compiler options resolution logic to eliminate code duplication between runtime-core and server-renderer.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[github-actions]

Size Report

Bundles

File	Size	Gzip	Brotli
runtime-dom.global.prod.js	105 kB (+37 B)	39.9 kB (+4 B)	35.8 kB (+7 B)
vue.global.prod.js	164 kB (+37 B)	59.9 kB (+2 B)	53.2 kB (-24 B)

Usages

Name	Size	Gzip	Brotli
createApp (CAPI only)	48.3 kB	18.8 kB	17.2 kB
createApp	56.5 kB	21.8 kB	20 kB
createSSRApp	60.7 kB	23.6 kB	21.5 kB
defineCustomElement	62.6 kB	23.8 kB	21.7 kB
overall	71 kB (+31 B)	27.2 kB (+4 B)	24.8 kB (+70 B)

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@vue/compiler-core

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@vue/compiler-ssr

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vue

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commit: 5df2d8b

[edison1105]

Thanks for the PR. Could you please fix the failing tests?