8000 fix: allow using typescript in `customElement.extend` option by paoloricciuti · Pull Request #16001 · sveltejs/svelte · GitHub
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fix: allow using typescript in customElement.extend option #16001

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Merged
merged 4 commits into from
May 26, 2025
Merged

fix: allow using typescript in customElement.extend option #16001

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e8267f4
fix: allow using typescript in `customElement.extend` option
paoloricciuti May 26, 2025
0dc08f5
chore: move `remove_typescript_nodes` in the same place as the rest
paoloricciuti May 26, 2025
603d6ba
docs: add note to custom element docs
paoloricciuti May 26, 2025
eb33944
docs: clarify `customElement.extend` is not processed by poreprocessors
paoloricciuti May 26, 2025
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docs: add note to custom element docs
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paoloricciuti committed May 26, 2025
commit 603d6ba9150b85fe8813e82f3ad219faf5b5009b
2 changes: 2 additions & 0 deletions documentation/docs/07-misc/04-custom-elements.md
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Expand Up @@ -114,6 +114,8 @@ When constructing a custom element, you can tailor several aspects by defining `
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```

> [!NOTE] While Typescript is supported in the `extend` function is subject to the same limitations of the script tags: you need to set `lang="ts"` on one of the scripts AND you can only use [erasable syntax](https://www.typescriptlang.org/tsconfig/#erasableSyntaxOnly) in it.

## Caveats and limitations

Custom elements can be a useful way to package components for consumption in a non-Svelte app, as they will work with vanilla HTML and JavaScript as well as [most frameworks](https://custom-elements-everywhere.com/). There are, however, some important differences to be aware of:
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