BookStack/app/Theming/ThemeEvents.php

<?php namespace BookStack\Theming;

/**
 * The ThemeEvents used within BookStack.
 *
 * This file details the events that BookStack may fire via the custom
 * theme system, including event names, parameters and expected return types.
 *
 * This system is regarded as semi-stable.
 * We'll look to fix issues with it or migrate old event types but
 * events and their signatures may change in new versions of BookStack.
 * We'd advise testing any usage of these events upon upgrade.
 */
class ThemeEvents
{
    /**
     * Application boot-up.
     * After main services are registered.
     * @param \BookStack\Application $app
     */
    const APP_BOOT = 'app_boot';

    /**
     * Commonmark environment configure.
     * Provides the commonmark library environment for customization
     * before its used to render markdown content.
     * If the listener returns a non-null value, that will be used as an environment instead.
     * @param \League\CommonMark\ConfigurableEnvironmentInterface $environment
     * @returns \League\CommonMark\ConfigurableEnvironmentInterface|null
     */
    const COMMONMARK_ENVIRONMENT_CONFIGURE = 'commonmark_environment_configure';
}