Adapt some existing IIFEs to match

cypress/cypress-image-snapshot-viewer.js

@@ -88,4 +88,4 @@
 		if (cleanUp) { cleanUp(); }
 	});
 
-})();
+}());

src/menus.js

@@ -1,10 +1,10 @@
-(() => {
+((exports) => {
 
 	const looksLikeChrome = !!(window.chrome && (window.chrome.loadTimes || window.chrome.csi));
 	// NOTE: Microsoft Edge includes window.chrome.app
 	// (also this browser detection logic could likely use some more nuance)
 
-	window.menus = {
+	const menus = {
 		[localize("&File")]: [
 			{
 				item: localize("&New"),
@@ -1238,4 +1238,6 @@
 		add_literal_navigation_speech_recognition(menu, top_level_menu_name);
 	}
 
-})();
+	exports.menus = menus;
+
+})(window);

src/storage.js

@@ -2,7 +2,7 @@
 // or maybe replace this module with localforage actually
 // (but need to address asynchronous concerns if doing that)
 
-(() => {
+((exports) => {
 	let localStore = {
 		get(key, callback) {
 			let i, item, len, obj, keys, keys_obj;
@@ -68,6 +68,6 @@
 		}
 	};
 
-	window.storage = localStore;
+	exports.storage = localStore;
 
-})();
+})(window);

src/theme.js

@@ -1,4 +1,4 @@
-(() => {
+((exports) => {
 	const default_theme = "classic.css";
 	const theme_storage_key = "jspaint theme";
 	const disable_seasonal_theme_key = "jspaint disable seasonal theme";
@@ -46,9 +46,9 @@
 
 	update_not_for_modern_theme();
 
-	window.get_theme = () => current_theme;
+	exports.get_theme = () => current_theme;
 
-	window.set_theme = theme => {
+	exports.set_theme = theme => {
 		current_theme = theme;
 
 		try {
@@ -176,4 +176,4 @@
 		document.body.appendChild(button);
 		grinch_button = button;
 	}
-})();
+})(window);