fix(ssr): combine empty source mappings#19226
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patak-cat merged 1 commit intovitejs:mainfrom Jan 23, 2025
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vitejs/vite#19226 introduced a change where by empty source mappings are not combined. As such when vitest has an internal error caused such as using jsdom feature that is not implemented which logs an error it tries to map the source map when the mapping is empty which results in an error such as: ``` Cannot read properties of undefined (reading 'map') ❯ VirtualConsole.<anonymous> node_modules/.pnpm/jsdom@26.1.0/node_modules/jsdom/lib/jsdom/virtual-console.js:29:53 ❯ module.exports node_modules/.pnpm/jsdom@26.1.0/node_modules/jsdom/lib/jsdom/browser/not-implemented.js:12:26 ❯ HTMLAudioElementImpl.load node_modules/.pnpm/jsdom@26.1.0/node_modules/jsdom/lib/jsdom/living/nodes/HTMLMediaElement-impl.js:112:5 ❯ HTMLAudioElement.load node_modules/.pnpm/jsdom@26.1.0/node_modules/jsdom/lib/jsdom/living/generated/HTMLMediaElement.js:109:34 ``` When the error originates from a file without source mapping such as `x.vue` it errors instead of logging original error.
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vitejs/vite#19226 introduced a change where by empty source mappings are not combined. As such when vitest has an internal error caused such as using jsdom feature that is not implemented which logs an error it tries to map the source map when the mapping is empty which results in an error such as: ``` Cannot read properties of undefined (reading 'map') ❯ VirtualConsole.<anonymous> node_modules/.pnpm/jsdom@26.1.0/node_modules/jsdom/lib/jsdom/virtual-console.js:29:53 ❯ module.exports node_modules/.pnpm/jsdom@26.1.0/node_modules/jsdom/lib/jsdom/browser/not-implemented.js:12:26 ❯ HTMLAudioElementImpl.load node_modules/.pnpm/jsdom@26.1.0/node_modules/jsdom/lib/jsdom/living/nodes/HTMLMediaElement-impl.js:112:5 ❯ HTMLAudioElement.load node_modules/.pnpm/jsdom@26.1.0/node_modules/jsdom/lib/jsdom/living/generated/HTMLMediaElement.js:109:34 ``` When the error originates from a file without source mapping such as `x.vue` it errors instead of logging original error.
blake-newman
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Jun 2, 2025
vitejs/vite#19226 introduced a change where by empty source mappings are not combined. As such when vitest has an internal error caused such as using jsdom feature that is not implemented which logs an error it tries to map the source map when the mapping is empty which results in an error such as: ``` Cannot read properties of undefined (reading 'map') ❯ VirtualConsole.<anonymous> node_modules/.pnpm/jsdom@26.1.0/node_modules/jsdom/lib/jsdom/virtual-console.js:29:53 ❯ module.exports node_modules/.pnpm/jsdom@26.1.0/node_modules/jsdom/lib/jsdom/browser/not-implemented.js:12:26 ❯ HTMLAudioElementImpl.load node_modules/.pnpm/jsdom@26.1.0/node_modules/jsdom/lib/jsdom/living/nodes/HTMLMediaElement-impl.js:112:5 ❯ HTMLAudioElement.load node_modules/.pnpm/jsdom@26.1.0/node_modules/jsdom/lib/jsdom/living/generated/HTMLMediaElement.js:109:34 ``` When the error originates from a file without source mapping such as `x.vue` it errors instead of logging original error.
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Description
devfor large files, i.e Astro 5's data layer #19218Current SSR transform skips collapsing
map: { mappings: '' }and uses magic-string generated map as is. However this is incorrect since empty mappings should get collapsed to empty mappings. Additionally, magic-string source map generation is unnecessary, so it can be skipped in this case.This change fixes a perf hit when plugin returns a large code from
loadortransformwith explicit empty mapppingmap: { mappings: '' }as par rollup convention https://rollupjs.org/plugin-development/#source-code-transformations.