Leaked Concurrency Handle (ARCH3085)

Key typescript.performance.leaked-concurrency-handle · Severity warning · Category performance

Concurrency primitives without a bounded lifetime (tasks with no cancellation signal, locks never released) run indefinitely, causing resource leaks and backpressure.

Incorrect

function startPolling(): void {
  setInterval(() => {
    void poll();
  }, 1000);
  // never cleared - runs forever
}

Correct

function startPolling(signal: AbortSignal): void {
  const timer = setInterval(() => {
    void poll();
  }, 1000);
  signal.addEventListener("abort", () => clearInterval(timer));
}

Fix

Tie tasks and timers to a cancellation signal; release locks in a finally block.