primo commit

media/plg_system_schedulerunner/joomla.asset.json

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+{
+  "$schema": "https://developer.joomla.org/schemas/json-schema/web_assets.json",
+  "name": "plg_system_schedulerunner",
+  "version": "4.0.0",
+  "description": "Joomla CMS",
+  "license": "GPL-2.0-or-later",
+  "assets": [
+    {
+      "name": "plg_system_schedulerunner.run-schedule",
+      "type": "script",
+      "uri": "plg_system_schedulerunner/run-schedule.min.js",
+      "dependencies": [
+        "core"
+      ],
+      "attributes": {
+        "type": "module"
+      },
+      "version": "229d3b"
+    }
+  ]
+}

media/plg_system_schedulerunner/js/run-schedule.js

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+/**
+ * @copyright   (C) 2021 Open Source Matters, Inc. <https://www.joomla.org>
+ * @license     GNU General Public License version 2 or later; see LICENSE.txt
+ */
+
+/**
+ * Makes calls to com_ajax to trigger the Scheduler.
+ *
+ * Used for lazy scheduling of tasks.
+ *
+ * @package  Joomla.Plugins
+ * @subpackage System.ScheduleRunner
+ *
+ * @since    4.1.0
+ */
+if (!window.Joomla) {
+  throw new Error('Joomla API was not properly initialised');
+}
+const initScheduler = () => {
+  const options = Joomla.getOptions('plg_system_schedulerunner');
+  const paths = Joomla.getOptions('system.paths');
+  const interval = (options && options.interval ? parseInt(options.interval, 10) : 300) * 1000;
+  const uri = `${paths ? `${paths.root}/index.php` : window.location.pathname}?option=com_ajax&format=raw&plugin=RunSchedulerLazy&group=system`;
+  setInterval(() => fetch(uri, {
+    method: 'GET'
+  }), interval);
+
+  // Run it at the beginning at least once
+  fetch(uri, {
+    method: 'GET'
+  });
+};
+(document => {
+  document.addEventListener('DOMContentLoaded', initScheduler);
+})(document);

media/plg_system_schedulerunner/js/run-schedule.min.js

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+/**
+ * @copyright   (C) 2021 Open Source Matters, Inc. <https://www.joomla.org>
+ * @license     GNU General Public License version 2 or later; see LICENSE.txt
+ */if(!window.Joomla)throw new Error("Joomla API was not properly initialised");const initScheduler=()=>{const t=Joomla.getOptions("plg_system_schedulerunner"),o=Joomla.getOptions("system.paths"),n=(t&&t.interval?parseInt(t.interval,10):300)*1e3,e=`${o?`${o.root}/index.php`:window.location.pathname}?option=com_ajax&format=raw&plugin=RunSchedulerLazy&group=system`;setInterval(()=>fetch(e,{method:"GET"}),n),fetch(e,{method:"GET"})};(t=>{t.addEventListener("DOMContentLoaded",initScheduler)})(document);