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1<?php
2
3// AUTOMATICALLY GENERATED.  DO NOT EDIT.
4// Use `composer build` to regenerate.
5
6namespace Wikimedia\IDLeDOM;
7
8/**
9 * OnBeforeUnloadEventHandlerNonNull
10 *
11 * @see https://dom.spec.whatwg.org/#callbackdef-onbeforeunloadeventhandlernonnull
12 *
13 * @phan-forbid-undeclared-magic-properties
14 */
15interface OnBeforeUnloadEventHandlerNonNull {
16    /**
17     * @param Event $event
18     * @return ?string
19     */
20    public function invoke( /* Event */ $event ): ?string;
21}