Source maps off when `<script>` doesn't contain at least one line break

[AriPerkkio]

Vue version

3.5.13

Link to minimal reproduction

https://stackblitz.com/~/edit/vue-source-maps-off?file=index.mjs

Steps to reproduce

pnpm install
node index.mjs
# Check links in ./links.md

What is expected?

Source maps of all fixtures/*.vue files should contain correct mappings. Using the source map visualizer it is visible that files 1-4 contain incorrect mappings.

What is actually happening?

Source maps of first.vue, second.vue, third.vue and fourth.vue are broken. Only the fifth.vue has correct mappings.

• first.vue: https://evanw.github.io/source-map-visualization#MTMyNABp
• second.vue: https://evanw.github.io/source-map-visualization#MTMyNgBp
• third.vue: https://evanw.github.io/source-map-visualization#MTMyNABp
• fourth.vue: https://evanw.github.io/source-map-visualization#MTMyNgBp
• fifth.vue: https://evanw.github.io/source-map-visualization#MTM2MABp

System Info

https://stackblitz.com

Any additional comments?

Bonus points if you can show me how to use Vue compiler directly without Vite. A minimal async function compile(sourceCode: string): { code: string, map: SourceMap }. ❤

[edison1105]

fixed via vitejs/vite-plugin-vue#585
try plugin-vue@5.2.4