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fix: Add check for builtin custom elements in set_custom_element_data #16592

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@edoardocavazza edoardocavazza commented Aug 9, 2025

Before submitting the PR, please make sure you do the following

  • It's really useful if your PR references an issue where it is discussed ahead of time. In many cases, features are absent for a reason. For large changes, please create an RFC: https://github.com/sveltejs/rfcs
  • Prefix your PR title with feat:, fix:, chore:, or docs:.
  • This message body should clearly illustrate what problems it solves.
  • Ideally, include a test that fails without this PR but passes with it.
  • If this PR changes code within packages/svelte/src, add a changeset (npx changeset).

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Fixes #16591

This PR introduces a check for builtin custom elements (is attribute) inside the set_custom_element_data helper in order to correctly set properties that have a setter.

I would like to add tests but I am not familiar with the codebase and wasn't able to find the correct path.

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changeset-bot bot commented Aug 9, 2025

🦋 Changeset detected

Latest commit: 240b84e

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package
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svelte Patch

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github-actions bot commented Aug 9, 2025

Playground

pnpm add https://pkg.pr.new/svelte@16592

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Set custom element data fails when using builtin custom elements.
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