Test signal reuse. Add AbortSignal polyfill. #2
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Added a test for reusing the same signal to cancel multiple fetch requests (e.g. https://developers.google.com/web/updates/2017/09/abortable-fetch#one_signal_many_fetches)
With that I noticed we needed a better polyfill to handle multiple event listeners, so I added an AbortSignal polyfill (with
EventTarget
). It's on a separate file so it can be swapped with any other implementation. I'm keen on fixing mo/abortcontroller-polyfill#11 and use that instead when ready.(Sorry, I know I could've pushed to your branch directly, but had already a big chunk of WIP on mine)