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Allow to bind EventCallable<void> to an optional callback #92

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@kireevmp kireevmp commented Dec 9, 2024

Right now public types prohibit binding EventCallable<void> to an optional prop.

Props[K] extends (...args: any[]) => any does not get distributed over unions, and does not handle unions that combine function and non-function type, like MouseEventHandler | undefined.

This is fixed by consolidating branches and moving payload: void case into a separate type that does distribute.

Reproduction: https://tsplay.dev/reflect-event-void-bind

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