fix: only create async functions in SSR output when necessary#17593
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Rich-Harris merged 4 commits intomainfrom Jan 30, 2026
Merged
fix: only create async functions in SSR output when necessary#17593Rich-Harris merged 4 commits intomainfrom
Rich-Harris merged 4 commits intomainfrom
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🦋 Changeset detectedLatest commit: 5190b76 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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Jan 30, 2026
* fix: only create async functions in SSR output when necessary * actually... * simplify generated code a bit more * simplify
7nik
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* fix: emit `each_key_duplicate` error in production * fix: preserve key * Update packages/svelte/src/internal/client/dom/blocks/each.js Co-authored-by: Rich Harris <rich.harris@vercel.com> * Update packages/svelte/src/internal/client/dom/blocks/each.js Co-authored-by: Rich Harris <rich.harris@vercel.com> * fix: ensure keys are validated * fix silly test name * fix: cover other case of duplicate keys * emit error on hydration * ensure the error is handled * drop useless tests * unused * finish merge * add lost check back * chore: bump playwright (#17565) * chore: bump playwright * maybe this will help somehow? * err whatever * fix * chore: allow testing in production env 2 (#17590) * Revert "chore: allow testing in production env (#16840)" This reverts commit ffd65e9. * new approach * fix: handle renderer.run rejections (#17591) * fix: handle renderer run rejections * add test * changeset * simplify * explanatory comment --------- Co-authored-by: Antonio Bennett <abennett@mabelslabels.com> Co-authored-by: Rich Harris <rich.harris@vercel.com> * fix: only create async functions in SSR output when necessary (#17593) * fix: only create async functions in SSR output when necessary * actually... * simplify generated code a bit more * simplify * fix: merge consecutive text nodes during hydration for large text content (#17587) * fix: merge consecutive text nodes during hydration for large text content Fixes #17582 Browsers automatically split text nodes exceeding 65536 characters into multiple consecutive text nodes during HTML parsing. This causes hydration mismatches when Svelte expects a single text node. The fix merges consecutive text nodes during hydration by: - Detecting when the current node is a text node - Finding all consecutive text node siblings - Merging their content into the first text node - Removing the extra text nodes This restores correct hydration behavior for large text content. * add test, fix * fix * fix * changeset --------- Co-authored-by: Miner <miner@example.com> Co-authored-by: Rich Harris <rich.harris@vercel.com> * Version Packages (#17585) Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com> * Revert "drop useless tests" This reverts commit 65f77ef. * update tests * fix test * we don't need to expose this function any more * figured it out... we cant have errors during reconcile * simplify * tweak * unused * revert no-longer-needed change * unused --------- Co-authored-by: Rich Harris <rich.harris@vercel.com> Co-authored-by: Antonio Bennett <31296212+Antonio-Bennett@users.noreply.github.com> Co-authored-by: Antonio Bennett <abennett@mabelslabels.com> Co-authored-by: FORMI <239411042+Richman018@users.noreply.github.com> Co-authored-by: Miner <miner@example.com> Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
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At the moment we use
asyncfunctions too liberally in SSR output — both in cases where anawaitis used (where it is necessary) and sometimes in cases where the template references values that aren't synchronously available (where it isn't). We also use$$renderer.childunnecessarily in these cases. Given something like this......we generate this:
As of this PR, it looks like this instead:
Before submitting the PR, please make sure you do the following
feat:,fix:,chore:, ordocs:.packages/svelte/src, add a changeset (npx changeset).Tests and linting
pnpm testand lint the project withpnpm lint