Decouple dispatching from attemptToDispatchEvent #22851
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gaearon
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Dec 2, 2021
| // Attempt dispatching an event. Returns a SuspenseInstance or Container if it's blocked. | ||
| export function attemptToDispatchEvent( | ||
| export let return_shouldDispatch = false; | ||
| export let return_targetInst = null; |
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Technically this leaks at module level but next event will clear it. So it's fine.
It is unnecessary because it's only true when retval is null.
salazarm
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* Decoupled dispatching from attemptToDispatchEvent * Remove unnecessary field It is unnecessary because it's only true when retval is null.
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Purely refactoring, no functional changes.
We need to split up dispatching from finding the blocked instance, so that we can apply different logic in each case (e.g. replay instead of dispatching through the event system). In #22680 we tried to do this via a special return type, but it's really noisy and I find it difficult to verify the existing behavior is intact. This is an alternative proposal, where we just use a few fields as makeshift "return values" to avoid allocating. I think I've seen this somewhere in the code. (I mean, we could also just use a tuple but idk if this is controversial for some reason.)
If we land this I think we can make #22680 simpler and more self-contained.