Delay subscribing to a component until its fully mounted #794
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JoviDeCroock
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Nov 12, 2025
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Resolves #768
This effectively addresses the "missing lifecycle" problem of React, when React suspends during mount it will discard any in progress work which means that the store won't be disposed and hence the subscriptions/... won't be discarded. We circumvent this by overriding the Signal
_subscribemethod, which sets up the subscriptions, to track all subscriptions for a store and only subscribe them when we are sure the component is fully mounted. This prevents us from subscribing on a work-in-progress state which will just be discarded.Why do I think this is breaking? React already has a rule not to setState during render but we can't be sure everyone expects that, hence we are marking this as breaking. No synchronous work should be able to intervene during component rendering hence this forking of
Signal.prototype._subscribeis safe as long as we ensure it's restored in the end.Thanks to the finally cleaning up with store.f() we are sure this restoration happens correctly. In the manual unmamaged one we might have patterns where we don't which I am fine with due to this being a major bump.
TODO:
Signal.prototype._subscribeis restored to its initial form