svelte

History

Sankalp Thakur 26786e9298 fix: skip controlled each fast path while another batch is pending (#18625 ) Fixes #18610 ### Problem In async mode, a controlled keyed `{#each}` throws `TypeError: Cannot read properties of undefined (reading 'e')` when its collection becomes empty while an earlier batch is still pending on the same block. The fast path in `pause_effects` cleared `state.items` and then called `destroy_effects`, which walks pending batch keys and reads `state.items.get(key).e`. Those EachItems are still needed for the pending batch (preserved offscreen), so clearing the map makes the dereference throw and aborts the commit mid-flight. ### Fix Only take the controlled-each fast path when `state.pending.size === 0`, so pending batches keep their items until they commit or discard.	3 weeks ago
..
svelte	fix: skip controlled each fast path while another batch is pending (#18625 )	3 weeks ago

fix: skip controlled each fast path while another batch is pending (#18625 )

Fixes #18610

### Problem

In async mode, a controlled keyed `{#each}` throws `TypeError: Cannot
read properties of undefined (reading 'e')` when its collection becomes
empty while an earlier batch is still pending on the same block.

The fast path in `pause_effects` cleared `state.items` and then called
`destroy_effects`, which walks pending batch keys and reads
`state.items.get(key).e`. Those EachItems are still needed for the
pending batch (preserved offscreen), so clearing the map makes the
dereference throw and aborts the commit mid-flight.

### Fix

Only take the controlled-each fast path when `state.pending.size === 0`,
so pending batches keep their items until they commit or discard.

svelte

fix: skip controlled each fast path while another batch is pending (#18625 )