fix(compiler-core): ensure mapping is added only if node source is available

[edison1105]

close #13261
close vitejs/vite-plugin-vue#368

• before
• with this PR

Summary by CodeRabbit

• Bug Fixes

  • Improved source map accuracy by ensuring mappings are only created for nodes with explicit source information.

• Tests

  • Added a test to confirm that generated comment nodes from v-if directives are correctly excluded from source maps.

[coderabbitai]

Walkthrough

The changes add a conditional check to only include nodes with valid loc.source in source map mappings within the code generator, preventing mappings for generated nodes without source information. Additionally, a new test verifies that comment nodes produced by v-if do not map to the original template source in the generated source map.

Changes

File(s)	Change Summary
packages/compiler-core/src/codegen.ts	Added condition to only call addMapping if node.loc.source exists, restricting source map entries.
packages/compiler-sfc/__tests__/compileTemplate.spec.ts	Introduced a test to ensure generated comment nodes from v-if do not map to original source code.

Assessment against linked issues

Objective	Addressed	Explanation
Remove generated code (e.g., v-if comment nodes) from source maps and ensure coverage tools reflect correct lines (#13261, #368)	✅
Add test cases to verify source map mapping for coverage, specifically for v-if branches (#13261)	✅

Poem

In the warren where code lines hop,
Source maps now know where to stop.
No more phantom lines in sight—
v-if’s comments mapped just right.
Coverage tools can now rejoice,
For every branch and every choice!
🐇✨

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📥 Commits

Reviewing files that changed from the base of the PR and between 56be3dd and bb76e0f.

📒 Files selected for processing (2)

• packages/compiler-core/src/codegen.ts (2 hunks)
• packages/compiler-sfc/__tests__/compileTemplate.spec.ts (1 hunks)

🔇 Additional comments (3)

packages/compiler-core/src/codegen.ts (2)

191-193: Good enhancement by conditionally adding mappings only for nodes with source information.

The addition of the node.loc.source check ensures source mappings are only created for nodes that have valid source locations, preventing incorrect mappings for compiler-generated nodes.

---

230-232: Consistent condition added for end location mapping.

This change correctly applies the same condition to the end location mapping as was applied to the start location mapping, ensuring complete consistency in the source map generation logic.

packages/compiler-sfc/__tests__/compileTemplate.spec.ts (1)

160-187: Well-designed test that verifies the source mapping enhancement.

This test effectively verifies that comment nodes generated by v-if directives don't map back to the original template source. It properly:

1. Compiles a template with a v-if directive
2. Verifies the source map structure
3. Locates the generated comment node
4. Confirms all source mapping attributes (line, column, source) are null

This complements the changes in codegen.ts by validating that generated nodes without source information are properly excluded from source maps.

✨ Finishing Touches

• 📝 Generate Docstrings

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[github-actions]

Size Report

Bundles

File	Size	Gzip	Brotli
runtime-dom.global.prod.js	101 kB	38.2 kB	34.4 kB
vue.global.prod.js	159 kB	58.4 kB	51.9 kB

Usages

Name	Size	Gzip	Brotli
createApp (CAPI only)	46.5 kB	18.2 kB	16.6 kB
createApp	54.5 kB	21.2 kB	19.4 kB
createSSRApp	58.7 kB	22.9 kB	20.9 kB
defineCustomElement	59.3 kB	22.8 kB	20.8 kB
overall	68.6 kB	26.4 kB	24 kB

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commit: bb76e0f

[edison1105]

/ecosystem-ci run

[vue-bot]

📝 Ran ecosystem CI: Open

suite	result	latest scheduled
vite-plugin-vue	✅ success	✅ success
nuxt	✅ success	✅ success
quasar	✅ success	✅ success
pinia	✅ success	✅ success
vant	✅ success	✅ success
primevue	✅ success	✅ success
test-utils	✅ success	✅ success
language-tools	✅ success	✅ success
vitepress	✅ success	✅ success
radix-vue	✅ success	✅ success
vueuse	✅ success	✅ success
vuetify	✅ success	✅ success
vue-simple-compiler	✅ success	✅ success
vue-macros	✅ success	✅ success
vue-i18n	✅ success	✅ success
router	✅ success	✅ success