♻️ refactor: split into testable modules, add test suite

src/providers/configuration.ts

@@ -0,0 +1,49 @@
+import fs from "fs";
+import path from "path";
+
+const ConfigurationData: Record<string, unknown> = {};
+
+function configDir(): string {
+  return path.join(process.cwd(), "configs");
+}
+
+function configExampleDir(): string {
+  return path.join(process.cwd(), "configs_example");
+}
+
+class Configuration {
+  public init(): void {
+    const dir = configDir();
+    if (!fs.existsSync(dir)) {
+      fs.mkdirSync(dir);
+    }
+    this.copyExampleIfNotExists("UpdaterConfig.json");
+
+    this.loadConfig("UpdaterConfig.json");
+  }
+
+  public loadConfig(configFileName: string): void {
+    const filePath = path.join(configDir(), configFileName);
+    if (!fs.existsSync(filePath)) throw new Error(`Config file ${configFileName} does not exist`);
+
+    const config = JSON.parse(fs.readFileSync(filePath, "utf-8"));
+    ConfigurationData[configFileName.replace(/\.[^/.]+$/, "")] = config;
+  }
+
+  public getConfig<T = unknown>(key?: string): T {
+    if (!key) return ConfigurationData as T;
+
+    if (ConfigurationData[key]) return ConfigurationData[key] as T;
+    throw new Error(`No configuration found for ${key}`);
+  }
+
+  private copyExampleIfNotExists(file: string): void {
+    const target = path.join(configDir(), file);
+    if (!fs.existsSync(target)) {
+      const example = path.join(configExampleDir(), file.replace(".json", ".example.json"));
+      fs.copyFileSync(example, target);
+    }
+  }
+}
+
+export default new Configuration();