fix: catch rejected promises while merging/committing#18266
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A committing/merging batch can have promises that were rejected (e.g. as obsolete). We gotta "forward" this rejection, too, instead of just the successful promise. At best it results in a uncaught rejection (`async-branch-merge-obsolete`), at worst it means error boundaries are not correctly displayed (`async-later-promise-fails-first`). Solves the reproduction in #18221 (comment)
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Rich-Harris
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May 21, 2026
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This PR was opened by the [Changesets release](https://github.com/changesets/action) GitHub action. When you're ready to do a release, you can merge this and the packages will be published to npm automatically. If you're not ready to do a release yet, that's fine, whenever you add more changesets to main, this PR will be updated. # Releases ## svelte@5.55.10 ### Patch Changes - fix: unlink errored and otherwise finished batch ([#18264](#18264)) - perf: walk composedPath() directly in delegated event propagation ([#18268](#18268)) - fix: transfer effects when merging batches ([#18254](#18254)) - fix: allow `$derived(await ...)` in disconnected effect roots ([#18273](#18273)) - fix: remove temporary raw-text hydration markers ([#18269](#18269)) - fix: propagate async `@const` blockers through closure references so template expressions like `{(() => host)()}` correctly wait for the awaited value ([#18309](#18309)) - fix: properly unlink batches ([#18298](#18298)) - fix: settle discarded batch ([#18290](#18290)) - fix: declare `let:` directives before `{@const}` declarations on slotted elements ([#18271](#18271)) - fix: resume outro-ed branches if they were kept around ([#18291](#18291)) - fix: avoid waterfall-warning when async resolves to same value ([#18297](#18297)) - fix: correctly coordinate component-level effects inside async blocks ([#18260](#18260)) - fix: make unnecessary commit work less likely ([#18263](#18263)) - chore: add tag name to `a11y_click_events_have_key_events` warning ([#18272](#18272)) - fix: catch rejected promises while merging/committing ([#18266](#18266)) Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
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A committing/merging batch can have promises that were rejected (e.g. as obsolete). We gotta "forward" this rejection, too, instead of just the successful promise. At best it results in a uncaught rejection (
async-branch-merge-obsolete), at worst it means error boundaries are not correctly displayed (async-later-promise-fails-first).Solves the reproduction in #18221 (comment)