Rewrite it in TypeScript; I have no idea if that works. It's still a work-in-progress.

src/domain/globals.ts

@@ -0,0 +1,87 @@
+/*
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+import {Layout} from "./layout";
+import {Theme} from "./theme";
+
+export class Globals {
+    private static layouts: Layout[] = [];
+    private static themes: Theme[] = [];
+
+    static registerTheme(name: string, styleClass: string): void {
+        if (Globals.themes.some(value => value.name === name)) {
+            console.log(`Theme with name '${name}' already registered; ignoring register request for styleClass '${styleClass}'.`)
+        } else {
+            Globals.themes.push({
+                name,
+                styleClass
+            });
+        }
+    }
+
+    static hasThemes(): boolean {
+        return Globals.themes.length > 0;
+    }
+
+    static hasMultipleThemes(): boolean {
+        return Globals.themes.length > 1;
+    }
+
+    static getFirstTheme(): Theme {
+        return Globals.getTheme(0);
+    }
+
+    static getTheme(index: number): Theme {
+        return Globals.themes[index];
+    }
+
+    static getThemes(): Theme[] {
+        return Globals.themes;
+    }
+
+    static registerLayout(langCode: string, layout: Layout): void {
+        const available = Globals.layouts.some(element => {
+                if (langCode === element.code) {
+                    console.error(
+                        `Error: Language code '${langCode}' cannot be registered for layout '${layout.prettyName}' 
+                         because it is already registered for layout '${element.prettyName}'!`
+                    );
+                    return false;
+                }
+                return true;
+            }
+        );
+        if (available) {
+            layout.code = langCode;
+            Globals.layouts.push(layout);
+        }
+    }
+
+    static hasLayouts(): boolean {
+        return Globals.layouts.length > 0;
+    }
+
+    static hasMultipleLayouts(): boolean {
+        return Globals.layouts.length > 1;
+    }
+
+    static getFirstLayout(): Layout {
+        return Globals.layouts[0];
+    }
+
+    static getLayouts(): Layout[] {
+        return Globals.layouts;
+    }
+}