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Related issue: https://github.com/denoland/deno/issues/19358. This is a regression that seems to have been introduced in https://github.com/denoland/deno/pull/18905. It looks to have been a performance optimization. The issue is probably easiest described with some code: ```ts const target = new EventTarget(); const event = new Event("foo"); target.addEventListener("foo", () => { console.log('base'); target.addEventListener("foo", () => { console.log('nested'); }); }); target.dispatchEvent(event); ``` Essentially, the second event listener is being attached while the `foo` event is still being dispatched. It should then not fire that second event listener, but Deno currently does. |
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