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fix(shared): render array style values in stringifyStyle - #15912
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A style property can be bound to an array of fallback values, e.g.
`{ display: ['-webkit-box', '-ms-flexbox', 'flex'] }`. This is a
documented form of the style binding: the browser keeps the last value it
supports. The client runtime already iterates such an array in
`patchStyle`, so the binding works when rendered on the client.
`stringifyStyle` only handled string and number values, so every path
that goes through it lost the declaration:
- `ssrRenderStyle` emitted `style=""`, so the server rendered element has
no style at all. The hydration style check is check-only, so the
element also stays unstyled after hydration until the binding changes.
- The hydration check stringifies the client binding with the same helper,
so if the markup does contain the fallbacks it reports a bogus
"Hydration style mismatch" on every render.
- `stringifyStatic` (compiler-dom) dropped the style of a hoisted static
element in the same way.
Render the entries of an array value in order, so all paths produce the
same declaration list as the client.
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Check name Status Explanation Description Check Check skipped - CodeRabbit’s high-level summary is enabled. Title check The title clearly and concisely describes the main change: updating shared stringifyStyleto render array-valued style properties.Linked Issues check Check skipped because no linked issues were found for this pull request. Out of Scope Changes check Check skipped because no linked issues were found for this pull request.
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Inline comments:
Review comments at @packages/shared/src/normalizeProp.ts:
- Around line 65-68: Update stringifyStyle’s array-value handling so a trailing
nullish fallback suppresses all serialized declarations for that property,
matching client rendering. Add a regression test for a style array ending in
null.
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packages/runtime-core/__tests__/hydration.spec.tspackages/server-renderer/__tests__/render.spec.tspackages/server-renderer/__tests__/ssrRenderAttrs.spec.tspackages/shared/__tests__/normalizeProp.spec.tspackages/shared/src/normalizeProp.ts
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Problem
The style binding accepts an array of fallback values — the documented "multiple values" form (docs):
The client runtime already handles it:
patchStyle→setStyleiterates the array and assigns every entry, so the browser keeps the last value it supports.stringifyStyleonly acceptedstring | number, so every path that goes through it dropped the declaration.SSR (
ssrRenderStyle):The element is rendered without the style at all, and the hydration style check is check-only, so it also stays unstyled after hydration until the binding changes.
Hydration check —
hydration.tsstringifies the client binding with the same helper, so when the markup does contain the fallbacks it reports a bogus mismatch on every render:stringifyStatic(compiler-dom) drops the style of a hoisted static element in the same way.Change
stringifyStylerenders each entry of an array value in order, skipping entries that aren't renderable, which is the same declaration list the client applies.NormalizedStyleis widened to the shapepatchStylealready accepts.Tests
All four new cases fail on
main(5 failed), and pass with the patch:packages/shared/__tests__/normalizeProp.spec.ts— stringification, including numbers,nullentries and custom propertiespackages/server-renderer/__tests__/ssrRenderAttrs.spec.ts—ssrRenderStylepackages/server-renderer/__tests__/render.spec.ts— full output for bothrenderToStringand the stream/pipe pathspackages/runtime-core/__tests__/hydration.spec.ts— no bogus style mismatch for fallback arraysVerification
pnpm vitest run --project unit --project unit-jsdom— 3892 passed, 6 skippedpnpm check,pnpm lint,pnpm format-check— cleanRelated
#15864, #14973 and #15641 touch the same helper, but are about different concerns (vendor-prefixed keys,
NaN/Infinity, top-level;splitting). This one only affects array values.Summary by CodeRabbit
nullorundefinedentries clear earlier fallbacks for that property; later values are retained.