First check-in of the code from the Obsidian Prj project.

src/decorators/Register.ts

@@ -0,0 +1,28 @@
+import { DIContainer } from '../DIContainer';
+
+/**
+ * A decorator to register a class in the DI (Dependency Injection) container.
+ * @template TargetType The type of the class to be registered.
+ * @param identifier The identifier used to register the class in the DI container.
+ * @param deprecated If true, the dependency is deprecated => a warning
+ * is logged when the dependency is resolved.
+ * @returns A function that is applied as a decorator to the class.
+ * @example
+ * ```ts
+ * \@Register('MyClassIdentifier')
+ * class MyClass {
+ *   // ...
+ * }
+ * ```
+ */
+export function Register<
+    TargetType extends new (...args: unknown[]) => InstanceType<TargetType>,
+>(identifier: string, deprecated?: boolean) {
+    return function (constructor: TargetType, ...args: unknown[]): void {
+        // Get the instance of the DI container
+        const diContainer = DIContainer.getInstance();
+
+        // Register the class in the DI container
+        diContainer.register(identifier, constructor, deprecated);
+    };
+}