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js/module-loader.js

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+(function () {
+  'use strict';
+
+  const root = window.PixelIslandModules ||= {};
+  const pending = new Map();
+
+  function loadScript(src) {
+    if (pending.has(src)) return pending.get(src);
+    const promise = new Promise((resolve, reject) => {
+      const script = document.createElement('script');
+      script.src = src;
+      script.defer = true;
+      script.onload = () => resolve(script);
+      script.onerror = () => reject(new Error(`Could not load ${src}`));
+      document.head.appendChild(script);
+    });
+    pending.set(src, promise);
+    return promise;
+  }
+
+  root.ModuleLoader = { loadScript };
+})();