OnBeforeUnloadEventHandlerNonNull.php
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OnBeforeUnloadEventHandlerNonNull.php
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	<?php

	// AUTOMATICALLY GENERATED. DO NOT EDIT.
	// Use `composer build` to regenerate.

	namespace Wikimedia\IDLeDOM;

	/**
	* OnBeforeUnloadEventHandlerNonNull
	*
	* @see https://dom.spec.whatwg.org/#callbackdef-onbeforeunloadeventhandlernonnull
	*
	* @phan-forbid-undeclared-magic-properties
	*/
	interface OnBeforeUnloadEventHandlerNonNull {
	/**
	* @param Event $event
	* @return ?string
	*/
	public function invoke( /* Event */ $event ): ?string;
	}