toStore not receiving updates from 5.22.3 onwards #15557
Description
Describe the bug
From 5.22.3 onwards, usage of toStore seems broken.
A simple case of wrapping some state
const count = toStore(() => counter, value => counter = value);and then using it in the template for example
Count state: {counter}
Count store: {$count}The count state updates as expected, but the count store never receives a new value.
Reproduction
See the following basic example:
https://svelte.dev/playground/0892822945674a63ad0d61aca0eba214?version=5.22.3
It works when running on 5.22.2:
https://svelte.dev/playground/0892822945674a63ad0d61aca0eba214?version=5.22.2
It also starts to work if you $inspect the store
https://svelte.dev/playground/a1380d57e6c24ab3aff00d8b74cda745?version=5.22.3
Logs
System Info
System:
OS: Linux 6.11 cpe:/o:nixos:nixos:25.05 25.05 (Warbler)
CPU: (16) x64 AMD Ryzen 7 7840U w/ Radeon 780M Graphics
Memory: 41.81 GB / 60.64 GB
Container: Yes
Shell: 5.9 - /run/current-system/sw/bin/zsh
Binaries:
Node: 22.14.0 - /etc/profiles/per-user/james/bin/node
Yarn: 1.22.22 - /etc/profiles/per-user/james/bin/yarn
npm: 10.9.2 - /etc/profiles/per-user/james/bin/npm
Browsers:
Chromium: 134.0.6998.88
npmPackages:
svelte: ^5.23.2 => 5.23.Severity
blocking an upgrade
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