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fix: warn if a plugin uses transformIndexHtml - #16394

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Rich-Harris merged 4 commits into
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warn-transformIndexHtml
Jul 17, 2026
Merged

fix: warn if a plugin uses transformIndexHtml#16394
Rich-Harris merged 4 commits into
version-3from
warn-transformIndexHtml

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@teemingc

@teemingc teemingc commented Jul 17, 2026

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closes #12391

Not sure how to word the warning message so I'm open to suggestions


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pkg-svelte-dev Bot commented Jul 17, 2026

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Install the latest version of @sveltejs/kit from 28a1920:

pnpm add https://pkg.svelte.dev/@sveltejs/kit/c/28a1920ffcbf702d324ded116a6dc49607845ce8

Open in pkg.svelte.dev: https://pkg.svelte.dev/repos/kit/pr/16394

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changeset-bot Bot commented Jul 17, 2026

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🦋 Changeset detected

Latest commit: 28a1920

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

This PR includes changesets to release 1 package
Name Type
@sveltejs/kit Patch

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Click here if you're a maintainer who wants to add another changeset to this PR

);
} else {
console.log(styleText(['bold', 'yellow'], '\nNo adapter specified'));
log.warn('\nNo adapter specified');

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Drive-by. Not sure why we don't use the logger class more

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this wording seems fine — when we eventually get round to cataloguing the errors/warnings and having links on the site, we can add more detail about appType: 'custom' and so on but it probably doesn't make sense to have all that yet

@Rich-Harris
Rich-Harris merged commit 1406668 into version-3 Jul 17, 2026
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@Rich-Harris
Rich-Harris deleted the warn-transformIndexHtml branch July 17, 2026 19:12
teemingc pushed a commit that referenced this pull request Jul 18, 2026
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# Releases
## @sveltejs/kit@3.0.0-next.10

### Major Changes

- breaking: move `defineEnvVars` to `@sveltejs/kit/env`
([#16375](#16375))

### Patch Changes

- fix: treat `data:` protocol URLs as external for redirect
([#16392](#16392))

- perf: skip import graph collection outside client environments
([#16383](#16383))

- fix: warn if there are plugins using `transformIndexHtml`
([#16394](#16394))

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
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Interaction with Vite transformIndexHtml plugin

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