event listener leak

Heap usage grows after repeated navigation, polling, subscriptions, cache writes, or background work. Clean up window, document, and shared element listeners in component lifecycles.

Removing DOM without removing listeners on long-lived targets.

Remove long-lived references, clear timers/listeners, and verify the object can be collected.

const id = setInterval(tick, 1000);
return () => clearInterval(id);

The visual proof is the active runtime event: watch what is retained, blocked, queued, or released at each step.

Repeat the workflow several times, take a heap snapshot, and confirm retained listeners, timers, or cached objects stop growing after cleanup.