fix: ensure sources within nested effects still register correctly #16193
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When an effect creates another effect and a proxy property is read that wasn't before, the proxy will have logic where it creates the new signal in its original reaction context. But it did not have logic to correctly handle the `reaction_sources` array which prevents effects/deriveds rerunning when state created inside themselves is read and then changed inside them: Since `reaction_sources` wasn't take the reaction context into account, false positives could occur where nested effects would not register the sources as dependencies. Fixes #15870
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Rich-Harris
approved these changes
Jun 17, 2025
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When an effect creates another effect and a proxy property is read that wasn't before, the proxy will have logic where it creates the new signal in its original reaction context. But it did not have logic to correctly handle the
reaction_sourcesarray which prevents effects/deriveds rerunning when state created inside themselves is read and then changed inside them: Sincereaction_sourceswasn't take the reaction context into account, false positives could occur where nested effects would not register the sources as dependencies.Fixes #15870
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feat:,fix:,chore:, ordocs:.packages/svelte/src, add a changeset (npx changeset).Tests and linting
pnpm testand lint the project withpnpm lint