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EventDispatcher Autowiring #21001

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@miqrogroove

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@miqrogroove
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There's not a single mention of how to autowire the kernel's EventDispatcher service in these files:

The dispatcher is the central object of the event dispatcher system. In
general, a single dispatcher is created, which maintains a registry of
listeners. When an event is dispatched via the dispatcher, it notifies all
listeners registered with that event::

https://github.com/symfony/symfony-docs/blob/7.3/event_dispatcher.rst

My attempt:

Cannot autowire service: argument "$events" of method "__construct()" references class
"Symfony\Component\EventDispatcher\EventDispatcher" but no such service exists.
Try changing the type-hint to one of its parents:
interface "Symfony\Component\EventDispatcher\EventDispatcherInterface",
interface "Psr\EventDispatcher\EventDispatcherInterface", or
interface "Symfony\Contracts\EventDispatcher\EventDispatcherInterface".

Presumably the first suggestion from the exception message would work, but I have no idea what those three different interfaces are for.

This should be better documented somewhere.

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        EventDispatcher Autowiring · Issue #21001 · symfony/symfony-docs