plug-leaking-promise-race

Never re-race the same pool of promises across loop iterations. Each call to Promise.race([A, B, …]) attaches fresh .then handlers to every arm. A promise that survives N iterations accumulates N handler sets. See nodejs/node#17469 and @watchable/unpromise.

Patterns

• Safe — both arms created per call:

  const value = await Promise.race([
    fetchSomething(),
    new Promise((_, r) => setTimeout(() => r(new Error('timeout')), 5000)),
  ])
  

• Leaky — pool survives across iterations, accumulating handlers: