fix(live): resolve variable shadowing in unsubscribe callback filtering - #1051
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The inner filter parameter 'callback' shadowed the outer 'callback' argument in the unsubscribe functions. This caused 'callback !== callback' to always evaluate to false, meaning all callbacks were inadvertently unsubscribed when attempting to remove a single listener. Changing the inner parameter to 'cb' correctly preserves the other active listeners.
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Hi team,
I found a bug in the live query unsubscribe logic where trying to remove a specific listener actually drops all subscribed callbacks.
The Bug
In packages/pglite/src/live/index.ts, the inner variable in the ilter function shadows the outer callback parameter:
ypescript callbacks = callbacks.filter((callback) => callback !== callback)Because of the shadowing, it checks if the callback is not equal to itself, which always evaluates to alse. As a result, the ilter() returns an empty array, and all live query listeners are wiped out whenever a single unsubscription occurs.
The Fix
I simply renamed the inner variable to cb in the three places this occurs:
ypescript callbacks = callbacks.filter((cb) => cb !== callback)This ensures the filter correctly identifies and removes only the intended listener while preserving the others. Let me know if you need any adjustments!