Define Data interface for DataService

src/services/data.ts

@@ -1,15 +1,22 @@
+interface Data {
+  limboMode: boolean
+}
+
 export default class DataService {
   private static file: Bun.BunFile | undefined;
-  private static _data: Record<string, unknown> = {};
+  private static _data: Data = {
+    // default values (will be overwritten)
+    limboMode: false
+  };
 
   static async load() {
     this.file = Bun.file("./data.json");
     if (!(await this.file.exists()))
-      await Bun.write(this.file, JSON.stringify({}, null, 2));
+      await Bun.write(this.file, JSON.stringify(this._data, null, 2));
-    this._data = await this.file.json();
+    this._data = { ...this._data, ...(await this.file.json()) };
   }
 
-  static set data(data: Record<string, unknown>) {
+  static set data(data: Data) {
     if (!this.file) throw new Error("DataService is not loaded. Please call DataService.load()");
     this._data = data;
     void Bun.write(this.file, JSON.stringify(this._data, null, 2));