diff --git a/.changeset/hungry-ads-beam.md b/.changeset/hungry-ads-beam.md new file mode 100644 index 0000000000..260d177119 --- /dev/null +++ b/.changeset/hungry-ads-beam.md @@ -0,0 +1,5 @@ +--- +'svelte': patch +--- + +fix: execute uninitialized derived even if it's destroyed diff --git a/packages/svelte/src/internal/client/reactivity/deriveds.js b/packages/svelte/src/internal/client/reactivity/deriveds.js index 83e23dfab6..75be018552 100644 --- a/packages/svelte/src/internal/client/reactivity/deriveds.js +++ b/packages/svelte/src/internal/client/reactivity/deriveds.js @@ -338,7 +338,12 @@ export function execute_derived(derived) { var prev_active_effect = active_effect; var parent = derived.parent; - if (!is_destroying_effect && parent !== null && (parent.f & (DESTROYED | INERT)) !== 0) { + if ( + !is_destroying_effect && + parent !== null && + derived.v !== UNINITIALIZED && // if it was never evaluated before, it's guaranteed to fail downstream, so we try to execute instead + (parent.f & (DESTROYED | INERT)) !== 0 + ) { w.derived_inert(); return derived.v; diff --git a/packages/svelte/tests/runtime-runes/samples/transition-derived-uninitialized/Child.svelte b/packages/svelte/tests/runtime-runes/samples/transition-derived-uninitialized/Child.svelte new file mode 100644 index 0000000000..20bd606d9b --- /dev/null +++ b/packages/svelte/tests/runtime-runes/samples/transition-derived-uninitialized/Child.svelte @@ -0,0 +1,10 @@ + + +