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SSR hydration fails with <Transition appear> and empty content #13394

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skirtles-code opened this issue May 27, 2025 · 0 comments · May be fixed by #13396
Open

SSR hydration fails with <Transition appear> and empty content #13394

skirtles-code opened this issue May 27, 2025 · 0 comments · May be fixed by #13396
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🔨 p3-minor-bug Priority 3: this fixes a bug, but is an edge case that only affects very specific usage. scope:hydration scope: transition

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@skirtles-code
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skirtles-code commented May 27, 2025 •
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Vue version

3.5.15 (older versions seem to have the same problem too)

Link to minimal reproduction

https://play.vuejs.org/#__SSR__eNp9kD1vwyAQhv8Kujmyh3aKrEptlaEd2qrNyIKcq0OCAXFHYinyfw/gfA1RNvQ+z8HLHeDV+2oXEebQMPbeKMYXaYVolkFZ0qydFcp7VKHECZBxLOpJqq9WCpr65gqYAVPr7L/uqg05m1445BkJreu9Nhi+fZ4jCXNRSGbKGLf/LBmHiLNz3q6x3d7JNzTkTMJPQMKwQwkXxip0yBNe/H3hkM4X2LtVNMl+AH+RnIm546S9RbtKtW+80vaj9y6wtt2SFgNjWsfpU7loNsfiS0hrfn/w9Wvdp+q5zEk7wngEt2yIww==

Steps to reproduce

Just open the Playground.

What is expected?

No error, successful hydration.

What is actually happening?

An error is thrown.

Failed to execute 'replaceChild' on 'Node': parameter 1 is not of type 'Node'.

Any additional comments?

I confirmed this also fails in Nuxt, not just in the Playground.

Without the appear prop there's still a hydration problem, but not the explosive error.

The <slot /> isn't required, it also fails if the <Transition> has no content, but I think a <slot /> is more realistic.
@edison1105 edison1105 added scope: transition 🔨 p3-minor-bug Priority 3: this fixes a bug, but is an edge case that only affects very specific usage. scope:hydration labels May 28, 2025
@edison1105 edison1105 linked a pull request May 28, 2025 that will close this issue
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🔨 p3-minor-bug Priority 3: this fixes a bug, but is an edge case that only affects very specific usage. scope:hydration scope: transition
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fix(ssr): ensure empty slots render as a comment node in Transition vuejs/core
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@edison1105 @skirtles-code